GROUP B Details of require Materials:

Transcription

1 SECTION - IV TECHNICAL SPECIFICATION OF ELECTRICAL MATERIALS ( Cross arm, Clamp, GI Pin, H/W fittings, Stay Sets, Stay wire, Insulators, Earthing device, Coil earth, Bolts, Nuts & Washer, Kit kat fuse, T.C fuse wire, Al. socket, AB Cable accessories, Danger board, Barbed wire, Channel & Angle ) GROUP B Details of require Materials: Sl No Item Description Unit Quantity 1 11 KV V Cross Arm (GI) No Back Clamp for 11 kv V (GI) No kv F Clamp (GI) No kv G I Pin No LT GI Pin No T & C Hard ware Fittings set mm G I HT Stay Set mm GI L.T. Stay Set /8 G I Stay Wire Kg /10 G I Stay Wire Kg /12 G.I. Stay Wire Kg

2 12 M S Clamp for Stay set(ht) Pair MS clamp for stay set (LT) No mm 2.5M long G I Perfortd Pipe Earthing Device No Earthing Coil No ph 4 w LT cross Arm No Back clamp for LT cross Arm No LT straps bolt & Nut pair mm GI Bolt & Nuts with Washer Kg i) M16x75 Nuts & Bolts (GI) Kg 1700 ii) M16x100 Nuts & Bolts (GI) Kg 1900 iii) M16x125 Nuts & Bolts (GI) Kg 2943 iv) M16x150 Nuts & Bolts (GI) Kg 2650 v) M16x175 Nuts & Bolts (GI) Kg 1800 vi) M16x200MS Nuts & Bolts(GI) Kg 1650 vii) M16 GI Washer Kg Amp. Kitkat Fuse No Amp. Kitkat Fuse No Amp. Kitkat Fuse No Amp TC fuse wire Kg Amp TC fuse wire Kg No - 6 G I Wire Kg No - 8 G I Wire Kg Al. Cable Socket i) 70 mm²

3 ii) 120 mm² 1400 iii) 150 mm² 1100 iv) 185 mm² Piercing Connector No Neutral connector No Suspension Clamp No Dead End Clamp No Poe Clamp with Eye Hook No Danger Notice Board 3179 Nos. i) LT Danger Notice Board No 879 ii) 11KV Danger Notice Board No 1500 iii) 33KV Danger Notice Board No Barbed wire Kg x50x6 mm MS Chanel Kg x40x6 mm MS Channel Kg x50x6 mm MS Angle Kg NB: 1. Bidders should put their authorized signature with office seal on each page of the documents. 2. Bidders should put their offer in the Guaranteed particulars column furnished in the tender documents. 3. Purchaser may ask to the bidder who will qualify in Techno- Commercial evaluation of the tenders for submission of Samples for verification, if required. 4. Purchaser reserves the right to increase or decrease the above quantities during placement of purchase order or may cancel any item/items without assigning any reason thereof. Dy. General Manager (Purchase & Store) NESCO, Balasore, Odisha - 3 -

4 TECHNICAL SPECIFICATION 1) 11 KV V Cross Arm (GI) : The Cross arm is to be made out of ISMC 75x40 with 50mmx6mm flat packing on top & bottom flange of the channel where the insulator pin is to be mounted conforming to REC construction standard & drawing. Galvanized the V cross arm as per IS-2633/1972.(Latest Amendment), IS :2629/1985 (1 st. Revision). Guaranteed Technical Particulars of 11KV 'V' Cross Arm Sl. No. Description Specified Bidders Offer 1 Type of Cross Arm ISMC 75x40 2 Channel Weight 7.14 Kg/mtr 3 Grade of Steel FY Steel Standard IS: Fabrication Standard IS:802 (part - 2) Dimension (75x40x4.8)mm 7 Size of M S Flat welded at both ends 50x8mm 8 Steel Tensile Strength 1500kgf/cm² 9 Working Load 200/300/350/400Kg 10 Total Weight (with tolerance per meter + 4%) 11.2 Kg (approx.) 2) Back Clamp for 11 KV V Cross arm (G.I) : Back clamp for 11 KV V cross arm made out of 50x8 mm MS Flat & galvanize as per IS-2633/1972. (Latest Amendment), suitable for 9mx300 Kg PSC poles confirming to REC Construction Standard & drawing enclosed

5 3) 11 KV F Clamp/ Pole top Bracket (GI) : 11 KV line pole top bracket made out of 50x8 mm M.S Flat & galvanize as per IS-2633/1972.(Latest Amendment), confirming to REC Construction Standard.A-7 & drawing. GUARANTEED TECHNICAL PARTICULARS FOR 11KV POLE TOP BRACKET Sl.No. Constructional Features Specified Bidders 1. Material used 50x8 mm MS Flat 2. Overall height 385 mm Offer 3. Flange Width (one welded & one bent) 60 mm 4. Spacing between two flanges 75mm 5. Spacing of 2 nos of 18mm holes for fixing on pole top 6. C/L Distance of 2nos of 22mm holes on top flanges of the bracket 100mm 25mm from edge of the flange 7. ISS Drawing enclosed 4) 11 KV GI Pin ) : 11 KV hot-dipped galvanizing Pin suitable for 11 KV pin insulator, confirming to REC Construction Standard. C- 1 and confirming to IS: 2486/Part-I/1971 & Part-II/1989, IS: 1363/1984, IS: 3063/1972, IS:2633/1972. GUARANTEED TECHNICAL PARTICULARS FOR 11KV G.I PIN Sl.No. Description Specified Bidders Offer 1 Manufacturer Name & Address To be specified by Bidder 2 Type of Pin 11KV 3 Applicable International Standard IS:2486 (part-ii) 4 Grade Steel HDG Steel 5 Steel Specification HDG Steel 6 Specification of Bolt & Nut As per ISS - 5 -

6 7 Specification of Bolt Threads As per ISS 8 Mechanical falling load (MFL) 10 KN 9 Elongation at MFL As per ISS 10 Maximum deflection of Pin Top at 1.5 mm MFL 11 Galvanising Specification IS Minimum weight of Steel deposited 610 g/m² on steel surface 13 Pin Length 315 mm 14 Shank Length 150 mm 15 Stalk Length 165 mm 16 Type of Thread As per ISS 17 Thread Length As per ISS 18 Drawing enclosed 5) LT GI Pin ) : LT hot-dipped galvanizing Pin suitable for LT pin insulator, confirming to REC Construction Standard. D-2 and confirming to IS: 2486/Part-I/1971 & Part-II/1989, IS: 1363/1984, IS: 3063/1972, IS:2633/1972. GUARANTEED TECHNICAL PARTICULARS FOR 11KV G.I PIN Sl.No. Description Specified Bidders Offer 1 Manufacturer Name & Address To be specified by Bidder 2 Type of Pin LT 3 Applicable International Standard IS:2486 (part-ii) 4 Grade Steel HDG Steel 5 Steel Specification HDG Steel 6 Specification of Bolt & Nut As per ISS 7 Specification of Bolt Threads As per ISS 8 Mechanical falling load (MFL) 10 KN 9 Elongation at MFL As per ISS 10 Maximum deflection of Pin Top at 1.5 mm MFL 11 Galvanising Specification IS Minimum weight of Steel deposited on steel surface 610 g/m² - 6 -

7 13 Pin Length 260 mm 14 Shank Length 125 mm 15 Stalk Length 135 mm 16 Type of Thread As per ISS 17 Thread Length As per ISS 18 Drawing enclosed 6) 11KV H.W fittings (T&C Type) : The hardware fittings for T & C Strain Disc Insulator. For use in 11 KV Overhead power lines shall comply IS:2486 (Part-I) 1971 and 2486 (Part-II) /1974 and IS:2486 (Part-III) 1974 IS:12048 /1987 and REC Specification 24/84 or the latest revision thereof. All Forging and Casting shall be good finish and free from flows and other defects. The edges on the outside of fittings such as at the Eye, Cleaves and Holes shall be rounded. All parts of different fittings, which provide for Inter-connection shall be made such that sufficient clearance is provided at the Connection Point to ensure free movement & suspension of the Insulator string Assembly.All eye and cleaves shall be free in this manner but care shall be taken that too much clearance between Eye & Tongs of the cleaves is avoided. All ferrous fittings and parts other than those of Stainless steel shall be hot dip galvanized as per ISS: 2633 / 1964.Small fittings like Spring washer, Nuts etc. may be Electro-galvanized as per IS-6745 / 72.The threads of nuts and topped holes when cut after Galvanizing shall be well cited & grassed. The Hardware fittings ( Tongue & Clevis type) shall be suitable for fixing on 75 mm x 40 mm Channel Cross Arm an accommodation 34mm²/55mm²/100mm² Conductors. The set shall comply of the following components :- (i) (ii) (iii) (iv) Cross arms straps (Dead & Straps) with Bolt (16mm) Nut and Spring Washer. Two Nos. forged cotter pints and spring washer to suit the tongue and the clevics. Formed helical fittings should be of suitable materials i.e all alloy aluminum steel suitable for 34mm²/55mm²/100mm² ACSR/AAAC. Strain clamps shall be suitable for the above ACSR conductor or AAAC. The ultimate strength of the clamp should not be less than 3000 Kg and slipping strength shall not be less than 90% of this figure. The clamp should be malleable cast iron/all alloy A-6. Tests : String insulator fittings shall comply with the following tests as per IS: 2486 (Part.I) Type Tests: a) Visual examination test ii) Verification of dimensions iii) Slip strength test iv) Mechanical test - 7 -

8 v) Electrical resistance test vi) Heating cycle test vii) Galvanising test. Acceptance/ Routine Test : i)verification of dimensions ii) Mechanical test iii) Galvanising test iv) Vidual examination test v) Routine mechanical test. GUARANTEED TECHNICAL PARTICULARS FOR 11 KV H/W FITTINGS ( T&C ) Sl.No. Description Specified Bidders Offer 1. Manufacturer Name & Address To be specified by Bidder 2. Standard Specification to IS: 2486 (Part-I,II &IV) which Hard ware Fittings shall confirm. 3 Ultimate strength 3000 Kg (min) 4. Dimensions in accordance IS: 2486(Part-II) with 5 Type of washer thickness a) Spring 2.5 mm b)flat 2.5 mm 6. Type of Clamp size Tension Clamp suitable for Squiral/Weasel/ Rabbit 7. Galvanised conform to IS 2633, IS: & IS: Weight of Fittings To be specified by the Bidder 9. Tolerance in dimension if any 10. Manufacturer trade mark to be embossed on the sets 11. Specific drawing to be enclosed. + 5% Specified by the Bidder Enclosed - 8 -

9 7) 18mm HT GI Stay Set : 8) 16mm LT Stay Set: TECHNICAL SPECIFICATION OF LT AND HT STAY SET 1. SCOPE This specification covers design, manufacture, testing and dispatch of GI Say Sets of 1 6 mm and 18 mm GI Stay Sets GENERAL REQUIREMENTS mm dia Stay sets (Galvanized) LT Stay Set This stay sets (Line Guy set) will consist of the following components: Anchor Rod with one washer and Nut Overall length of rod should be 1800 mm to be made out of 16 mm dia GS Rod, one end threaded up to 40 mm length with a pitch of 5 threads per cm and provided with one square GS washer of size 40X40x1.6mm and one GS hexagonal nut conforming to IS:1367:1967 & IS:1363:1967. Both waster and nut to suit threded rod of 16 mm dia. The other end of the rod to be made into a round eye having an inner dia of 40mm with best quality welding Anchor Plate Size 200 x 200 x6 mm To be made out of GS plate of 6 mm thickness. The anchor plate should have at its centre 18 mm dia hole Turn Buckle & Eye Bolt with 2 Nuts To be made of 16 mm dia GS Rod having an overall length of 450mm, one end of the rod to be threaded up to 300 mm length with a pitch of 5 threads per cm and provided with two GS Hexagonal nuts of suitable size conforming tois:1363:1967 & IS:1367:1967. The other end of rod shall be rounded into a circular eye of 40mm inner dia with proper and good quality welding Bow with Welded Angle To be made out of 16mm dia GS rod. The finished bow shall have an over all length of 995 mm and eight of 450 mm, the apex or top of the bow shall be bent at an angle of 10 R. The other end shall be welded with proper and good quality welding to a GS angle 180 mm long having a dimension of 50x50x6mm. The angle shall have 3 holes of 18 mm dia each

10 2.1.5 Thimble To be made on 1.5 mm thick GS sheet into a size of 75x22x40mm and shape as per standard shall be supplied. Average Weight of Finished 16mm Stay Sets shall be at least KG (Minimum) (Excluding Nuts Thimbles and Washer) Kg. (Maximum) mm dia. Stay sets (Galvanized) HT Stay Set This stay sets (Line Guy set) will consist of the following components: Anchor Rod with one washer and Nut Overall length of rod should be 1800 mm to be made out of 18 mm dia GS Rod, one end threaded up to 40 mm length with a pitch of threads per cm and provided with one square GS washer of size 50X50x1.6mm and one GS hexagonal nut conforming to IS:1367:1967 & IS:1363:1967. Both waster and nut to suit threded rod of 18 mm dia. The other end of the rod to be made into a round eye having an inner dia of 40mm with best quality welding Anchor Plate Size 300 x 300 x8 mm To be made out of GS plate of 8 mm thickness. The anchor plate should have at its centre 20 mm dia hole Turn Buckle & Eye Bolt with 2 Nuts To be made of 18 mm dia GS Rod having an overall length of 450mm, one end of the rod to be threaded up to 300 mm length with a pitch of 5 threads per cm and provided with two GS Hexagonal nuts of suitable size conforming tois:1363:1967 & IS:1367:1967. The other end of rod shall be rounded into a circular eye of 40mm inner dia with proper and good quality welding Bow with Welded Channel To be made out of 18 mm dia GS rod. The finished bow shall have an over all length of 995 mm and eight of 450 mm, the apex or top of the bow shall be bent at an angle of 10 R. The other end shall be welded with proper and good quality welding to a GS angle 200 mm long having a dimension of 100x50x4.7mm. The channel shall have 2 holes of 18 mm dia and 20 mm dia hole at its centre as per drawing enclosed Thimble To be made on 1.5 mm thick GS sheet into a size of 75x22x40mm and shape as per standard shall be supplied

11 3. Galvanizing The complete assembly shall be hot dip galvanized as per ISS. 4. Welding The minimum strength of welding provided on various components of 16mm and 18 mm dia stay set shall be 3100 kg & 4900 Kg respectively. Minimum 6mm filet weld or its equivalent weld area should be deposited in all positions of the job i.e. at any point of the weld length. The welding shall be conforming to relevant IS:823/1964 or its latest amendment. 5. Threading The threads on the Anchor Rods, Eye Bolts and Nuts shall be as per specification IS; 4218:1967 (ISO Metric Screw Threads). The Nuts shall be conforming to the requirements of IS: 1367:1967 and have dimension as per IS 1363:1967. The mechanical property requirement of fasteners shall confirm to the properly clause 4.6 each for anchor rods and Eye bolt and property clause 4 for nuts as per IS: 1367: TESTS The contractor shall be required to conduct testing of materials at Govt./Recognized testing laboratory during pre-dispatch inspection for Tensile Load of 3100 Kg / 4900 Kg applied for one minute on the welding and maintained for one minute for 16 mm and 18 mm dia stay sets respectively. 7. IDENTIFICATION MARK All stay sets should carry the identification mark of the Purchaser NESCO as applicable. This should be engraved on the body of stay rods to ensure proper identification of the materials. The nuts should be of a size compatible with threaded portion of rods and there should be not play or slippage of nuts. Welding wherever required should be perfect and should not give way after erection. 8. TOLERANCES The tolerances for various components of the stay sets are indicated below subject to the condition that the average weight of finished stay sets of 16mm dia excluding nuts, thimbles and washers shall not be less than the weight specified above:

12 GURANTEED TECHNICAL PARTICULARS OF LT /HT STAY SETS Sl No. Item Description Specified Parameters Section Tolerances Fabrication Tolerances Material Type of Stay Sets Bidder s offer 1. Anchor Plate 2. Anchor Rod 3. Turn Buckle Bow 4. Eye Bolt Rod 6mm thick +2.5%-5% 8 mm thick +2.5%-5% 16mm dia +5%- 3% 18 mm dia +5%- 3% 16mm dia +5%-3% 18mm dia +5%-3% 16mm dia +5%-3% 18 mm dia +5%-3% 200x200mm+1% GS Plate 6 mm thick 300x300mm+1% GS Plate 8 mm thick Length 1800mm + 0.5% Rounded Eye 40 mm inside dia +3% Threading 40mm+ 11%-5% GS Round 16mm dia GS Round 16mm dia Length 1800mm + GS Round 0.5% 18mm dia Rounded Eye 40 GS Round mm inside dia +3% 18mm dia Threading 40mm+ 11%-5% 995mm+1% GS Round 16mm dia. Length180mm +1% GS Angle 50x50x6 mm 995mm+1% GS Round 18mm dia. Length200mm +1% GS Channel 100x50x4.7mm Length 450mm + 1% Threading 300mm +1% Round Eye 40mm inside dia+3% Length 450mm + 1% Threading 300mm +1% Round Eye 40mm inside dia+3% GS Round 16 mm dia LT Stay Set HT Stay Set LT Stay Set HT Stay Set LT Stay Set HT Stay Set LT Stay Set GS Round 18 mm dia HT Stay Set

13 5 Galvanisatio n thickness a Anchor Plate b Anchor Rod c TurnBuckle Bow d Eye Bolt Rod All galvanization shall be carried out in accordance with IS: The weight of Zinc deposited shall be in accordance with IS: 2629 and shall not less than 0.61 kg/m² with a minimum thickness of 86 microns for items of thickness more than 5 mm, 0.46kg/m²(64 microns) for items of thickness between 2 mm & 5 mm& 0.33kg/m²(47 microns) for items less than 2 mm thickness. 6 Thimble 2 nos. to be made of 1.5 mm thick G.S Sheet into a size 75x22x40 mm & shape as per standard. 7 One G.S Hexagonal Nut confirming to IS:1363 & 1367 with one square washer of size 50x50x6 mm (G.S) along with Anchor Rod. 8 Two G.S Hexagonal Nuts of suitable size along with Eye Bolt Rod. 9) 7/8 GI Stay Wire : 10) 7/10 GI Stay Wire : 11) 7/12 GI Stay Wire : TECHNICAL SPECIFICATIONS 7/8 SWG, 7/10 SWG and 7/12 SWG STAY WIRE) 1. Application Standards Except when they conflict with the specific requirements of this specification, the G.I Stay Stranded Wires shall comply with the specific requirements of IS: IS: & IS: or the latest versions thereof. 2. Application and Sizes a) The G.I. stranded wires covered in this Specification are intended for use on the overhead power line poles, distribution transformer structures etc. b) The G.I stranded wires shall be of 7/8 SWG ( 7/4.0 mm for 33 KV lines), 7/12 SWG( 7/3.15 mm for 11KV lines) and 7/12 SWG (7/2.5 mm for LT lines) standard sizes. 3. Materials

14 The wires shall be drawn from steel made by the open hearth basic oxygen or electric furnace process and of such quality that when drawn to the size of wire specified and coated with zinc, the finished strand and the individual wires shall be of uniform quality and have the properties and characteristics as specified in this specification. The wires shall not contain sulphur and phosphorus exceeding 0.060% each. 3.1 Tensile Grade The wires shall be of tensile grade 4, having minimum tensile strength of 700 N/mm² conforming to 1S: General Requirements a) The outer wire of strands shall have a right-hand lay. b) The lay length of wire strands shall be 12 to 19 times the strand diameter. 3.3 Minimum Breaking Load & Galvanising The minimum breaking load of the wires before and after stranding shall be as follows: Min. breaking load of the No. of Wires & Const. Wire Dia (mm) Single wire before stranding (KN) Min. breaking load of the standard wire (KN) 7 (6/1) (6/1) (6/1) Minimum weight of zinc coating before stranding Minimum weight of zinc coating before stranding 490 gm/mm2 490 gm/mm2 490 gm/mm2 475 gm/mm2 475 gm/mm2 475 gm/mm2 4. Construction a) The galvanized stay wire shall be of 7-wire construction. The wires shall be so stranded together that when an evenly distributed pull is applied at the ends of completed strand, each wire shall take an equal share of the pull

15 b) Joints are permitted in the individual wires during stranding but such joints shall not be less than 15 metres apart in the finished strands. c) The wire shall be circular and free from scale, irregularities, imperfection, flaws, splits and other defects. 5. Tolerances A tolerance of (+) 2.5% on the diameter of wires before stranding shall be permitted. 6. Sampling Criteria The sampling criteria shall be in accordance with IS : Tests on Wires before Manufacture i) The wires shall be subjected to the following tests in accordance with IS :2141. a) Ductility Test b) Tolerance on Wire Diameter ii) Tests on Completed Strand The completed strand shall be tested for the following tests in accordance with IS:2141. a) Tensile and Elongation Test: The percentage elongation of the stranded wire shall not be less than 6%. b) Chemical analysis c) Galvanizing Test The Zinc Coating shall conform to "Heavy Coating" as laid down in 1S: Marking Each coil shall carry a metallic tag, securely attached to the inner part of the coil bearing the following information: a) Manufacturers name or trade mark b) Lot number and coil number c) Size d) Construction e) Tensile Designation f) Lay g) Coating h) Length i) Mass j) ISI certification mark, if any 9. Packing The wires shall be supplied in Kg. coils. The packing should be done in accordance with the provisions of IS:

16 GURANTEED TECHNICAL PARTICULARS STAY WIRE (7/8 SWG) Sl. No. Description Specified Bidder s offer 1. Manufacturer s name & address To be specified by the Bidder 2 Nominal diameter of wire in mm Tolerance in diameter in mm + 2.5% 4 Minimum breaking load in Kg Tensile strength Kgf/mm² Overall diameter of stranded wire in mm Sectional Area (in mm².) Coating Test a Type of zinc coating whether heavy or light Heavy b Weight of coating in g/m² a Length of wire in each coil in mtr. 117 b Tolerance + 5% 10 No. of dips the coating is able to withstand 3 dip in min. as 18 ± 20ºC 11 Adhesion Test (Wrap Test at 1 turn per second coiling while stress not exceeding % nominal tensile strength) a Min. complete turn of wrap To be specified by bidder b Dia of mandrel on which wrapped - do - 12 Bend Test a Angle - do - b Dia round a format to be bent - do - 13 Freedom from defect - do - 14 Chemical composition the MS Wire used shall not exceed a Sulphur 0.060% - do - b Phosphorous 0.065% - do - 15 a Weight of each coil in Kg 70 to 100 b Tolerance + 5% 16 a Weight of wire in Kg/Km 750 b Tolerance + 5% 17 Standard according to which the solid wire is manufactured and tested ISS: 2141/1992 & ISS: 4826/

17 GURANTEED TECHNICAL PARTICULARS STAY WIRE (7/10 SWG) Sl. No. Description Specified Bidder s offer 1. Manufacturer s name & address To be specified by the Bidder 2 Nominal diameter of wire in mm Tolerance in diameter in mm + 2.5% 4 Minimum breaking load in Kg Tensile strength Kgf/mm² Overall diameter of stranded wire in mm Sectional Area (in mm².) Coating Test a Type of zinc coating whether heavy or light Heavy b Weight of coating in g/m² a Length of wire in each coil in mtr. 193 b Tolerance + 5% 10 No. of dips the coating is able to withstand 3 dip in min. as 18 ± 20ºC 11 Adhesion Test (Wrap Test at 1 turn per second coiling while stress not exceeding % nominal tensile strength) a Min. complete turn of wrap To be specified by bidder b Dia of mandrel on which wrapped - do - 12 Bend Test a Angle - do - b Dia round a format to be bent - do - 13 Freedom from defect - do - 14 Chemical composition the MS Wire used shall not exceed a Sulphur 0.060% - do - b Phosphorous 0.065% - do - 15 a Weight of each coil in Kg 70 to 100 b Tolerance + 5% 16 a Weight of wire in Kg/Km 465 b Tolerance + 5% 17 Standard according to which the solid wire is manufactured and tested ISS: 2141/1992 & ISS: 4826/

18 GURANTEED TECHNICAL PARTICULARS STAY WIRE (7/12 SWG) Sl. No. Description Specified Bidder s offer 1. Manufacturer s name & address To be specified by the Bidder 2 Nominal diameter of wire in mm Tolerance in diameter in mm + 2.5% 4 Minimum breaking load in Kg Tensile strength Kgf/mm² Overall diameter of stranded wire in mm Sectional Area (in mm².) Coating Test a Type of zinc coating whether heavy or light Heavy b Weight of coating in g/m² a Length of wire in each coil in mtr. 298 b Tolerance + 5% 10 No. of dips the coating is able to withstand 3 dip in min. as 18 ± 20ºC 11 Adhesion Test (Wrap Test at 1 turn per second coiling while stress not exceeding % nominal tensile strength) a Min. complete turn of wrap To be specified by bidder b Dia of mandrel on which wrapped - do - 12 Bend Test a Angle - do - b Dia round a format to be bent - do - 13 Freedom from defect - do - 14 Chemical composition the MS Wire used shall not exceed a Sulphur 0.060% - do - b Phosphorous 0.065% - do - 15 a Weight of each coil in Kg 70 to 100 b Tolerance + 5% 16 a Weight of wire in Kg/Km 310 b Tolerance + 5% 17 Standard according to which the solid wire is manufactured and tested ISS: 2141/1992 & ISS: 4826/

19 12) MS Clamp for HT Stay set : HT stay clamp suitable for PSC poles made out of 50x8 mm MS Flat with two coat of red-oxide primer, confirming to REC Construction Standard & drawing enclosed. 13) MS Clamp for LT Stay set : LT stay clamp suitable for PSC poles made out of 50x6 mm MS Flat with two coat of red-oxide primer, confirming to REC Construction Standard & drawing enclosed. 14) 40mm dia GI Earthing Device: 1. Scope :- Technical Specifications This specification provides for design, manufacturing, testing before dispatch, supply & delivery of Earthing Device (Heavy Duty) (for use in Sub-station earthing). 2. APPLICABLE STANDARDS :- The Earthing Device must be made out of 40 mm nominal Bore & 3.2 mm (Medium Gauge- No minus Tolerance allowed) wall thickness Hot Dip G.I. Pipe (as per IS ;- 1239,m Part-1, 1990 & REC construction Standard J-2), ISI marked of reputed Make & 2.5 mtrs length tapered finished smooth at one end for a length of 75 mm & Clamp at the other end. Staggered drills hole of 12 mm Dia of interval of 150mm shall be made before galvanization. The GI Earthing Clamp/ Strip (C- Clamp Type) is to be of 50mm width, 6mm thickness & flange length of 65 mm in each side. This should be suitable for termination of 4 nos of GI Flat earth electrodes. The Clamp/ Strip & Earthing pipe after fabrication will be hot dip galvanized confirming to IS: 2629/85 with latest amendments. The clamp shall have two holes in both sides suitable for 5/8 x 2 Bolt & provided with two GI bolts& Nuts in each side of 5/8 x 2 long half threaded with spring washer as per IS: 3043/1982.The galvanization tests are to be conducted as per IS: 2633/72 & IS: 6745/72 & its latest amendments

20 Guaranteed Technical Particulars of Earthing Device (To be submitted along with Offer) Part 1. Location of Factory or Place of Manufacture 2. Maker s Name, Address & Country 3. Size of a Pipe b Earthing Strips 4. Length 5. Thickness of Pipe 6. Galvanization Process 7. Galvanization thickness a For Earthing device b For Connecting Flat 8. Galavanization tests to be conducted as per ISS 9. Any other Particulars ( like details of Clamp/ G.I. Bolts) 10. Details of Drawings submitted Bidder s Offer 15) EARTHING COIL : EARHTING COIL TECHNICAL SPECIFICATION SCOPE : The specification covers design, manufacture, testing and dispatch to the owner s stores of Earthing Coils for use in earthing of the HT & LT poles. GENERAL REQUIREMENTS : Earthing coils shall be fabricated from soft GI Wire Hot Dip Galvanized. The Hot Dip galvanized wire shall have clean surface and shall be free from paint enamel or any other poor conducting material. The coil shall be made as per REC constructions standard. The Hot Dip galvanizing shall conform to IS: 2629/1966, 2633/1972 and 4826/1969 with latest amendments

21 TESTS : Galvanizing Tests Minimum Mass of Zinc On GI Wire used 280 cm/m² After Coiling-266 gm/m².the certificate from recognized laboratory shall be submitted towards mas of zinc. Dip Test Dip test shall stand 3 dips of 1 minute and one dip of ½ minute before coiling and 4 dips of 1 minute after coiling as per IS: 4826/1979 Adhesion Test As per ISS DIMENSIONAL REQUIREMENT i) Nominal dia of GI Wire -4 mm (Tolerance±2.5%) ii) iii) iv) Minimum no. of turns 115 Nos. External dia of Coil (Min) 50 mm Length of Coil (Min) 460 mm v) Free length of GI Wire at one end coil (Min.) 2500 mm vi) The turns should be closely bound. Weight of one finished Earthing Coils (min.) Kg. Guaranteed Technical Particulars of Coil Earth Sl. GENERAL TECHNICAL No. PARTICULARS 1 Nominal diameter of wire 2 No. of turns 3 External dia of Coil 4 Length of Coil 5 Mass of Zinc 6 Total weight of Coil 7 Whether drawing enclosed (yes) Bidder s Offer

22 16) 3 Ph. 4 W LT Cross arm: LT cross arm (3 phase,4 wire) made out of 75mm x40 mm Channel. The cross arm shall be fabricated out of (75x40) mm channel with 50mmx6mm cleats as per drawing on top & bottom flange of the channel where the insulator pin to be mounted, conforming to REC Construction Standard & drawing.. 17) Back Clamp for LT Cross arm: Back clamp for LT cross arm made out of 50x6 mm MS Flat with two coat of red-oxide primer suitable for PSC poles confirming to REC Construction Standard & drawing. 18) LT straps Bolt & Nut : LT strap for LT shackle insulator (type-1) made out Hot dip galvanized strap 3x35 mm -2 nos. GI Bolts & nuts -12Mx115 mm -2 nos. with 3mm thick double spring washer conforming to REC Construction Standard D4 & drawing. 19) 16 mm dia. Hexagonal Bolts & Nuts and Washer (G.I) 16 mm diameter GI Nuts and Bolts black hexagonal As per IS: 1387 (Part-II) Gr.-4/4.6 of following size. M16x75 Nuts & Bolts (GI) i) M16x100 Nuts & Bolts (GI) ii) M16x125 Nuts & Bolts (GI) iii) M16x150 Nuts & Bolts (GI) iv) M16x175 Nuts & Bolts (GI) v) M16x200MS Nuts & Bolts(GI) vi) M16 GI Washer (GI) Washers (GI) shall be round of thickness 1.5 mm suitable for 16 mm dia. bolts. Specification finished products: 1. The bolts & Nuts shall be ISI Marked Mild Steel of Black Grade B and shall be round with hexagonal head. (i) The Bolts and Nuts shall be manufactured by Hot/Cold forging process neatly and cleanly finished and shall have metric threads as per IS : 4218/1967 with its latest amendments. (ii) The dimensions of the bolts & nuts and tolerances should conform to IS: 1363 with their latest amendments in all respect. The eccentricity and angular errors of various elements shall be within specified limits as per IS: 1367/1967 with its latest amendments the bolts & nuts shall be free from forging and threading defects such as cuts, spats. burns, bulging taper eccentricity, loose fill etc. which may affect their serviceability

23 (iii) The colt heads and nuts shall be chamfered on one face only and other face shall be machined made. (iv) Mechanical property requirement of tester shall conform to IS: 1367 (Part-III) 1979 property class 4.6 for bolts & property class-5 for nuts as per IS: 1367 (Part VI) (v) The bolts, nuts & washer are to be galvanized with hot dip as per IS: 2633/1989 with latest amendment. (vi) The bolts & nuts shall be supplied in well-cleaned conditions and suitably protected against corrosion in individual bags of 50 kgs. ACCEPTANCE TESTS: The bidder should furnish test certificate from recognized Govt. Laboratory ( NABL accredited) giving the results of tests as per IS: 1367 (Part-Ill) 1979 & IS: 1367 (Part-VI) 1980 The test certificate shall be in respect of the following for all sizes of both bolts & nuts as applicable given below:- i) Dimensional particulars (Sampling Ifl accordance with IS: 2614 for both bolts & nuts (tolerance as per drawing). ii) Tensile strength test on full size (for bolts minimum 400 NI Sq.mm and for Nuts Proof Stress test Mm 610 N/Sq. mm). iii) Power load test on full size bolts and M N for 15 Sec. iv) Head soundness tests for bolts (no fracture). v) Brinell hardness tests or Rockwell Hardness or Vickers s Hardness tests for bolts min- 114 &max. 209 or mm. 67 & max. 95 or mm. 120 & max. 220 respectively. For nuts Vickers s Hardness mm. 130 & max Markings: On the bolt head, there shall be identification marking of the manufacturer as well as property class 4.6. If possible property class 5 shall be marked on Nuts also. Further ISI mark shall be marked on Gunny Bags for proper identification

24 Amp Kit Kat Fuse : Amp Kit Kat Fuse : Amp Kit Kat Fuse : Kit Kat Fuse unit with porcelain base & carrier of reputed brand complete with extended terminals as per relevant ISS : 2086/1993, Amendment-I: 1. SCOPE This application cover the manufacture, testing at works and supply of porcelain rewireable kit kat fuses suitable for AC 3 phase 415 V 50 HZ solidly grounded neutral system. 2. WEATHER CONDITION: The material used in construction of the fuse unit shall be suitable for use under following weather condition:- I) Temp. Range 0 to 50 C ii) Relative humidity 2% to 100% iii) Altitude-upto 1000 Meters iv) Use Outdoor, in dist. box or indoor in consumers premises. 3. RATED VOLTAGE AND FREQUENCY. The fuses shall be suitable for continuous operation at AC 415 V and frequency 50 Hz. 4. RATED CURRENTS: The rated currents of fuses units shall be 100/200 /300 Amps. 5. APPLICATION STANDARDS: I) IS: 2086/1993 with latest amendment for fuses upto 100 A &This specification. ii) This specification for 200 A/300A kit kat fuses. 6. GENERAL CONSTRUCTION REQUIREMENT OF KIT KAT FUSES: 6.1 MATERIALS: This rewireable fuses units shall be made of ceramic which shall be of sand fine grain homogenous nonporous chemically insert and high electrical and mechanical strength and shall be thoroughly verified and smoothly glazed. It shall be non-ignitable/ The porcelain and glaze shall be white or cream in colour. The glaze shall cover at least those surfaces which are exposed when the,fuses have been mounted in the intended manner. Themounting surface may be left unglazed. The materials should not have any defect such as i) Crazing : A hairline crack in glaze of ceramic material. ii) Dunt : A hair line fracture extending through the body and the glaze and caused by strains set-up in the process of manufacture of ceramics materials

25 iii) Projection : A raised imperfection, projecting more than 0.75 mm above the Surface of the ceramic material. iv) Water : The ceramics material shall not absorb more than absorption 2% of its weight of water when broken and tested for. 6.2 The design and dimension of the fuses shall be either in accordance with r relevant IS PROTECTION: The carrier and fuse base when installed in the intended manner shall have all live parts so protected as to prevent inadvertent contact with such live parts. 6.4 HANDLING GRIP: The fuse carrier shall be provided with a handle or grip and shall be shaped in acceptable manner so that it will be easy to withdraw the carrier without use of any tools and without danger to any L.M. or operator. 6.5 METAL PARTS: All metal parts shall be protected against corrosion by suitable methods. 6.6 FUSE BASE: The fuses base shall be provided with two fixing holes for fixing the fuse base by means of screwier bolts The fuse base shall have contacts for suitably engaging with the contacts of the fuse carrier rigidly under any condition. The contacts shall be made out of such a metal which will not lose its electricity due to heating of the contracts on full load with 20% overload current or heat generated and required pressure is maintained even after repeated engagements and disengagement. The contact for rating 63 A and above will also have extended strips for fixing cable lugs by means of bolt Live parts on the underside of the fuse base for surface mounting shall be either covered by a shield or barrier of insulating materials or be counter sunk not less than 3mm below the surface of the base and covered with water proof insulating sealing compound which will not deteriorate or flow at a temp. lower than 100 degree C or on full load current with 20% overload or blowing of fuse under short circuit condition or shall have clearance of not less 9mm for 100A, 200A and 300A size from the mounting surface and reliably prevented from loosening. 6.7 FUSE CARRIER: The fuse carried shall have contacts suitable for engaging with fuse base contacts. They shall be provided with suitable terminals for the connection of the fuse elements. The fuse carrier shall be so constructed that it is capable of being reversible for introduction into the fuse base. The contacts shall be made out of the metal which will not loose its elasticity on account of heating of the contacts on full load with 20% overload conditions or heating due to blowing of the fuse element due to short circuit and required pressure is maintained and even after repeated engagement and disengagement Live parts of the fuse carrier shall be covered either by a shield for barrier of insulating materials or be counter sunk not less than 3 mm below surface of the base and covered with water proof insulating sealing compound which will not deteriorated or flow at temp. lower than 100 C

26 6.8 The asbestos cloth to be provided in fuse base shall be fire proof insulating and of sufficient length width and thickness. 6.9 SPRING FOR BASE PHOSPHOR BRONZE CONTACT (For 200 Amp/300 Amp only) This should be round/elliptical made from high quality spring steel sufficient to maintain uniform pressure on the contact surface when fuse carrier is fitted. The spring shall be of sufficient width and having 1 mm thickness SCREWS: I) Screws upon which the general assembly of the fuse base and carriers terminals and contacts depend shall be prevented from loosening or backing out buy lock, washers, stacking or other reliable means. ii) If screws used in the assembly of a fuse are loosened or removed in order to install the fuse elements or to connect the fuse into a circuit they should be thread into metal and shall be provided with washers CURRENT CARRYING PARTS: I) Current carrying parts shall be of robust construction and capable of carrying their rated current without exceeding the temp. rise limits clause of IS specification i.e. 55 degree centigrade for rating 100amps & 65 degree centigrade for 200 amps/ 300 amp kit kat fuse. II) Iron and steel parts shall not be used for current carrying parts except as clamping device or pressure such as punching screws, clamps or wire binding screws and nuts CONTACTS: The contacts of the fuse base, fuse carrier, terminal blocks/strips shall be as under: i] Fuse carrier contacts (Male Contacts) Tinned Brass ii] Fuse Base Contacts (Female Contacts) Tinned Brass with terminal. iii] Terminal block/strips Tinned Brass The current carrying screws and washers shall be of tinned brass while the screw, washers not carrying current shall be M.S. Galvanized M.S. Electro Galvanized bolt and nut with one plain washer and one spring washer suitable for 120 mm², 185 mm², 240 mm² / 300 mm² cable lugs shall be provided with extended strips for 100A, 200A and 300A fuse respectively Chemical composition of the contacts. Electrolytic copper (tinned phosphor bronze (Tinned) use for contacts of KK fuse shall confirm to various IS asstated below. a) Electrolytic Copper Copper strips used for contacts of kit kat fuse should confirm to IS:1897/1983 with latest amendments. The material shall be of electrolytic tough pitch (ETP) grade with minimum 99.9% of copper & silver as per table I of IS191 part IV. b) Phosphor Bronze The phosphor bronze used for contacts of KK fuse shall confirm to any of the grade-i, II or III given in IS: 7814/1985 (with latest amendments). The requirement of metal composition should be as per IS c) Brass It shall confirm to grade LCB1/DCB2 of IS-1264/1997 (with latest amendment)/is 4101/1977 with latest amendment). The metal composition for casting shall be as per IS 1264 and that of brass sheet, as per IS The contact fixing screw holes in fuses shall be fitted with insulating material fully into the surface of the kit kat fuse carrier

27 7. EMBOSSING : 7.1 Every fuse carrier shall be clearly and indelibly embossed with the following information. I) Rated Current ii) Rated voltage iii) Size of fuse wire iv) Manufacturer s name/trade mark. v) NESCO 7.2 Every fuse base shall be clearly and indelibly marked with the following. I) Manufacturers name/trade mark. ii) NESCO 8.0 TYPE TEST CERTIFICATES: 8.1 The firm has to submit type test certificates for test conducted on their own brand name make for reputed make fuses for all the tests as per cl.no of IS: 2086/1993 (with latest amendment) carried out at CPRI Bhopal/Bangalore/ERDA, Baroda/ NIBL or Govt. Recognized laboratory The firm has to submit chemical composition certificates for each contact used in each rating of fuses offered for sample tested at ERDA Baroda or any Govt.Recognized laboratory as per relevant ISS. 8.3 The above type test certificates and metal composition certificates shall be complete viz. for all tests and for all parts and submitted along with the offer. Incomplete/delayed test certificates and metal composition certificates shall not be considered. The tests for rewirable fuses shall be carried out as per the procedure detailed in I.S However, for the guidance of the tenderer, the different type tests are mentioned below: a) Visual examination. b) Test for dimensions. c) Test for mechanical endurance. a) Test for mechanical strength. b) Test for temperature rise: - As per Clause No.9.6 of I.S. 2086/1993, temperature rise of different parts of the kitkats when tested in an ambient temperature of 40 C, should not exceed 55 C. c) Insulation Resistance test d) High Voltage test. e) Test for breaking capacity. f) Test for water absorption. g) Test on ceramic material. h) Ignition test (for non-ceramic materials) i) Test for withdrawal force. 9.0 ACCEPTANCE LOT: 9.1 SAMPLING CRITERIA: The Number of fuse carriers and fuse bases to be selected from the lot shall be in accordance with Appendix-B of IS: 2086/1993. However, the lot size shall constituted of all the fuse carriers and fuse bases of the same ratings

28 9.2 ACCEPTANCE TEST. The fuse carriers and fuse bases selected as per 9.1 (of this specification) shall be subject to the acceptance test in following order. i) Visual examination (ii) Dimensional check (iii) Test for Mechanical endurance (iv) Test for withdrawal force (v) Test for temp. rise (vi) Insulation resistance test (vii) High voltage test (viii) Temp. Cycle test. N.B.: For purpose of temp. cycle test and temp. rise test one sample from every batch of (or less) for each current rating has to selected and tested ROUTINE TEST: The routing test certificate duly signed by the testing engineers of the firm clearly stating that the following routine tests has been conducted by him on each fuse unit, shall be kept ready and submitted to the inspecting officer prior inspection of lot offered and testing of samples. I) Visual examination ii) High voltage test VERIFICATIONM OF METALIC COMPOSITION OF CONTACTS: 11.1 NESCO reserves the right to draw the samples of metallic parts of kit kat fuses for verifications of metallic composition at the time of manufacture from the lot offered for inspection. In addition to this, the samples will be drawn from the lots received by the consignees for verification of metallic composition. In the event the metallic composition does not confirm to our specifications. The NESCO reserves the right to cancel the order at the cost and risk of the supplier Amp TC Fuse Wire: Amp TC Fuse Wire: TECHNICAL SPECIFICATION OF TINNED COPPER FUSE WIRE 1. SCOPE This specification is intended to cover the design, manufacture and testing before despatch, supply and delivery of Tinned Copper Fuse Wire at NESCO stores. Tinned copper fuse wire shall be used for rewirable type electric fuses for protection of lines and transformers. 2.STANDARD:- The Tinned Copper Fuse wire shall be generally comply in all respect to the requirement of relevant IS:9926/1981 amended upto date except wherever modified in this specification. Consideration may be given to alternative which the supplier consider advisable by reasons of his own manufacturing requirements and experiences, provided descriptive matter is submitted and recommended device of arrangement is equal to or superior to that required by the accompanying specification and if the purchaser is convinced of the quality and/ or superiority of the material

29 3. TECHNICAL SPECIFICATION: The Tinned Copper Fuse wire shall be conforming to the IS:9926/1981 with latest amendments, if any. The Tinned Copper fuse wire shall comply with the following requirements:- a) The fuse wire shall be made from electrolytic tough pitched (ETP) copper (tinned) conforming to IS:8130/1984 amended upto date. b) The fuse wire shall be circular and shall have a uniform cross section and free from pits, draw marks or any other harmful surface defects. c) The tin coating layer shall be uniform, smooth, continuous and firmly adherent to the base copper material. d) The electrical properties of the material used for making the fuse wires shall be as given hereunder:- e) i. Resistivity at 20 C ohm mm Sq./m ii. Density at 20 C gm/cub cm. iii. Constant mass temp. deficient of resistance at 20 C / C. iv. Coefficient of linear expansion x 10-6 / C. v. Diameter & maximum allowable Resistance Rated Current of fuse wire Nominal diameter Tolerance (+/-) t Permissible resistance in Ohm per meter at 20 C A mm mm Max. Min To be furnished by bidder 4. TEST CERTIFICATE: The bidder must furnish type test reports along with bid as specified in IS: with latest amendments, from the testing house as specified. 5. TESTS : The samples of all ratings/ sizes will be tested as per sampling plan of ISS at your works free of cost in

30 presence of our inspecting officer for compliance to the requirement of guaranteed technical particulars and relevant IS:9926/1981. for acceptance of offered lot. Acceptance Tests The following tests shall be carried out as Acceptance Tests on the samples to be selected as per sampling plan:- i) Visual examination. ii) Dimensional Check. iii) Resistance Check. 6. PACKING: The wire shall preferably be supplied in spools weighing 10 gms to 50 gms. The spools shall be so packed that the fuse wire are adequately protected against damages in ordinary handling and transit. The net weight of fuse wire of one spool should be 1000 gms to 2000 grms. 7. MARKING: Each packing containing spools/ reels/ coils of fuse wire shall be clearly marked with the following information :- i. Manufacturer s name or trade mark.: ii. Name of purchaser : NESCO iii. Purchaser s PO No. & date.: iv. T he material of fuse wire i.e. copper. v. Length and weight of each spool. vi. ISI certification mark. vii. The rated current. 25. No.6 GI Wire: 26. No.8 GI Wire : TECHNICAL SPECIFICATION OF GI WIRE WIRE 1. Qualification Criteria of Manufacturer:- The prospective bidder may source GI Wire from manufacturers only who must qualify all the following requirements: a) The manufacturer must have successfully carried out Type Test of similar item from any NABL Accredited Laboratory within the last 5 years, prior to the date of submission of the bid. b) The manufacturer should have supplied at least 500 Kgs. (all sizes taken together) to electricity supply utilities / PSUs. The bidder should enclose Performance Certificates from the above users issued in the name of the manufacturer as proof of successful operation in field. 2. SCOPE This specification covers manufacture, testing and supply of hot dip galvanized MS solid wire of sizes 6 SWG (5 MM) & 8 SWG (4 MM) diameters

31 3. APPLICABLE STANDARDS ZINC Zinc shall conform to grade Zen 98 specified in IS 209& IS: with up to date amendments. ZINC COATING Zinc coating shall be in accordance with IS: for heavily coated hard quality. GALVANISING Galvanizing shall be as per IS: , IS with up to date amendments UNIFORMITY OF ZINC COATING Uniformity of zinc coating shall be as per IS: with up to date amendments TENSILE PROPERTIES The tensile strength of the wire after galvanizing shall be between Kg/sq.mm ensuring MS wire mechanical properties as per IS-28: to 8.3 FREEDOM FROM DEFECTS As per IS: & & with up to date amendments be ensured 4. MATERIAL The mild steel wire shall have chemical composition maximum sulphur %, phosphorous %, Carbon 0.25%. 5. TESTS During the process of manufacturer/fabrication and all tests for chemical, mechanical, galvanizing as per IS , IS , IS , IS: & shall be carried out. The certificate towards, chemical composition shall be submitted for each lot offered for inspection. The following tests shall be conducted in presence of the representative of the purchaser: Visual physical inspection and measurement of specified dimension Coating test as per IS: , IS , IS: , IS: Adhesion test as per IS: , IS: , IS: , IS: ,& IS: Tensile strength and breaking load and elongation determined as per IS: with up to date amendments. 6. PACKING & MARKING Packing shall be as per IS: and each coil shall be between kg. marking shall be as per IS:

32 Guaranteed Technical Particulars for No. 6 G.I. wire Sl. No. GENERAL TECHNICAL PARTICULARS Guaranteed Value 1 Nominal diameter of wire in mm 4.88 mm 2 Tolerance in diameter in mm + 2.5% 3 Sectional Area (in Sq. mm.) Tensile strength of wire in N/mm²/ MPa Minimum breaking load (KN) 9 6 Variety Hard/Soft Soft 7 Type of Galvanizing Hot dip heavy coating 8 Weight of Zinc coating (Gms/Sq. Mtr.) No. of dips the coating is able to withstand as 18 ± 20ºC 3 dip in Min 10 Adhesion Test (Wrap Test at 1 turn per second coiling while stress not exceeding % nominal tensile strength) To be specified by bidder i) Min. complete turn of wrap do ii) Dia of mandrel on which wrapped do 11 Bend Test do i) Angle do ii) Dia round a format to be bent do 12 Freedom from defect do 13 Chemical composition the MS Wire used shall not exceed do i) Sulphur 0.060% do ii) Phosphorous 0.065% do 14 Weight of wire in Kg/Km Tolerance in wt. + 5% 16 Standard according to which the solid wire is manufactured and tested IS: 280/1978, IS: 4826/1979, IS: 7887/1975 Bidders Offer

33 Guaranteed Technical Particulars for No. 8 G.I. wire Sl. No. GENERAL TECHNICAL PARTICULARS Guaranteed Value 1 Nominal diameter of wire in mm 4.06 mm 2 Tolerance in diameter in mm + 2.5% 3 Sectional Area (in Sq. mm.) Tensile strength of wire in N/mm²/ MPa Minimum breaking load (KN) Variety Hard/Soft Soft 7 Type of Galvanizing Hot dip heavy coating 8 Weight of Zinc coating (Gms/Sq. Mtr.) No. of dips the coating is able to withstand as 18 ± 20ºC 3 dip in Min 10 Adhesion Test (Wrap Test at 1 turn per second coiling while stress not exceeding % nominal tensile strength) To be specified by bidder ii) Min. complete turn of wrap do ii) Dia of mandrel on which wrapped do 11 Bend Test do iii) Angle do iv) Dia round a format to be bent do 12 Freedom from defect do 13 Chemical composition the MS Wire used shall not do iii) Sulphur 0.060% do iv) Phosphorous 0.065% do 14 Weight of wire in Kg/Km Tolerance in wt. + 5% 16 Standard according to which the solid wire is manufactured and tested IS: 280/1978, IS: 4826/1979, IS: 7887/1975 Bidders Offer

34 27. Aluminium Cable Socket Cable Lugs of Aluminium tubular terminal end of any reputed make with ISI mark for crimping to all conductors suitable for following cable sizes. i) 70 mm², ii) 120mm², iii) 150 mm² & 185mm² 28. Piercing Connector 29. Neutral Connector 30. Suspension Clamp 31. Dead End Clamp 32. Pole Clamp with Eye Hook TECHINICAL SPECIFICATIONS FOR AB CABLE ACCESSORIES Technical specification for insulation piercing connectors, Dead End Clamp (Anchor), Suspension Clamp, Neutral Connector & Eye hook for Arial Bunch Cables for working voltage upto and including 1100 Volts. INSULATION PIERCING CONNRCTOR (IPC) 1.0 Scope This specification covers the design, manufacture, assembly, testing and supply of Insulation Piercing Connectors (IPC) making connections to Bare Messenger L.T XLPE insulated Aerial Bunched Cables rated up to1100 volts to L.T XLPE insulated Aerial Bunched Cables / Service cable ( Twin core double insulated flat PVC Aluminium wire of different sizes) 2.0 Standard The design, performance and test requirements shall confirm to this specification and the following standards. However in case of any conflict, the requirements of this specification shall prevail. 1) REC Specification 83/2010 ( Insulation Piercing Connectors) 2) NFC ( Insulation Piercing Connectors) 3) IS 7098 part 1 XLPE insulated Cables 4) IS 398 Part IV : aluminum alloy conductors

35 The devices shall also be compatible with the cables of sizes & dimensions as defined in the cable Specifications for the cables with which they are intended to be used. 3.0 Cable Data AB Cable The standard sizes and characteristics of the phase and street lighting conductors, bare messenger wires shall be as specified in IS: and REC Specification 32/1984 of following sizes a) 3x95 (Insulated Phase)+1x70(Bare Messenger)+1x16(Insulated street lighting) sq.mm b) 3x50 (Insulated Phase)+1x35(Bare Messenger)+1x16(Insulated street lighting) sq.mm c) 3x50 (Insulated Phase)+1x35(Bare Messenger) d) 2x50 (Insulated Phase)+1x35(Bare Messenger ) sq.mm e) SERVICE CABLE Twin core double insulated single strand flat PVC Aluminium wire of size 2.5/4/6/10 sq mm. 4.0 Types Of Insulation Piercing Connectors(IPC) Insulation Piercing Connectors (IPC) is used for making Tee/Tap-off/Service connectors to an ABC Line. Insulation Piercing Connectors are designed to make a connection between the uncut main conductor and a branch cable conductor without having to strip either cable to expose the conductor. Instead, the tightening action of the IPC will first pierce the Insulation, and then make good electrical contact between the main end and branch conductor while simultaneously insulating and sealing the connection. The standard size ranges for various applications are given below: Requirement Insulation Piercing Connectors for Tap off phase & Street Lighting core Insulation Piercing Connectors for service connections Main Cable Size range sq mm (AB Cable) sq mm (AB Cable) Branch Cable Size range sq mm (AB Cable) sq mm (PVC Al service Cable) 4.1 Marking and Embossing The Connector shall be indelibly marked with the following information: Name or Logo of manufacturer Name Purchaser, Model Number Sizes of Max and Min Main and Branch cables for which it is suitable. The permanence of the marking shall be permanent

36 5. CONSTRUCTIONAL FEATURES OF INSULATION PIERCING CONNECTORS The following features of Insulation piercing bare connectors are to be met for the qualification criteria 1. The connector bodies shall be made entirely of mechanical and weather resistant plastic insulation material made of weather & UV resistant reinforced polymer and no metallic part outside the housing is acceptable except for the tightening bolt or nuts. 2. Any metallic part that is exposed must not be capable of carrying a potential during or after connector installation. 3. Screws or nuts assigned for fitting with IPC must be fitted with torque limiting shear heads to prevent over tightening or under tightening While the min & max torque values are to be specified by Manufacturer, these should not exceed 20 N mtr for IPC for main conductor < 95 sq mm and 30 N mtr for main conductor >95 but < 150 sq mm. 4. The IPC must perform piercing of Tap insulated conductor connection on Main cable simultaneously using single bolt for tightening as multiple bolts do not ensure even tightening. Design of connector needs to avoid the stripping of insulated tap conductor and make the connection by piercing the insulation. 5. The shear bolt/nut shall be suitable for tightening with a hexagonal spanner of 13 mm. 6. The contract blade of the connector is made of tinned copper/aluminum alloy. 7. The IPC shall be water proof and the water proof and the water tightness shall be ensured by appropriate elastomer materials and not by grease gel or paste alone. Grease can be applied to protect the contact blade alone and shall not be visible of the outer surface of the connector. Connector should not be dipped in grease. 8. Each IPBC should be provided with a cap to seal the cut end of the insulated Branch cable. It should be of a design that once the connector id fitted, it shall not be possible to remove the cap without dismantling the connector. 9. Design of IPBC should be such as to not cause damage to insulation of adjacent conductors due to vibration and relative movement during service. 10. All the metallic parts of the connector should be corrosion resistant and there should not be any appreciable change in contact resistance & temperature after overloads & load cycling and should be confirm to the long duration tests specified in this standard. 6. TESTING REQUIREMENTS OF INSULATION PIERCING CONNECTORS The following tests are intended to intended to establish performance characteristics of insulation piercing connectors and categorized as follows: Sr No. Test Type Test Acceptance Test Routine Test 1 visual X X 2 Dimensional X X

37 3 Mechanical Electrical Continuity and Shear head & mechanical behavior Effect of tightening the mechanical strength of main core Checking mechanical strength of tap core X X X Dielectric & Water 4 tightness test X X X 5 Climate Ageing Test X 6 Corrosion Test X 7 Electrical ageing test X 7.0 General Test Condition Connectors to be tested shall be identified using the following elements Minimum marking details requested in this specification. The minimum and maximum operating torque of shear off head. Nominal torques of the re-usable tightening screws. Min-Max conductor range suitable for Main and Tap. X X X X X X 8.0 SAMPLING PLAN FOR ACCEPTANCE TESTS Sampling Plan for acceptance tests on IPCs are as per ISO as mentioned below. a) For Visual and Dimensional Sampling Level: General Inspection Level 1 SL NO LOT SIZE SAMPLE SIZE 1 51 to to to to to to to to to to & over 500 b) For Mechanical and Voltage Tests Sampling Level: Special Inspection Level S

38 SL NO LOT SIZE SAMPLE SIZE 1 51 to to to to to to to to to to & over Type Test For IPCs, the Type Test Report should be submitted from an Independent NABL Accredited Laboratory like CPRI,ERDA e.t.c / International Laboratory Accreditation Corporation, Mutual Recgnitions arrangement (ILAC,MRA) signatory Laboratory like COFRAC The installation of the connectors shall be done in the laboratory following instructions provided by the manufacturer. The Test report shall include the Model Number, Applicable size Range, and GA Drawing showing the principal parts and dimensions of the connector The following shall constitute Type Tests for Insulation Piercing Connectors. a) Electrical Ageing Test b) Dielectric and Water Tightness Test c) Mechanical Tightening Test & Shear head behavior d) Effect of tightening on main core e) Effect of tightening on branch core f) Climatic test in accordance with NFC g) Corrosion Test in accordance with NFC Acceptance Tests The Acceptance Tests are to be conducted as per clause no. 6 above & REC Spec. 83/ 2010 and as per relevant IS Specifications. 9.0 Drawings & Samples: GA drawings, GTP and other particulars along with samples are to be submitted along with offer

39 10.0 SUSPENSION CLAMPS Scope This specification covers the design, manufacture, assembly, testing and supply of Accessories for suspending Aerial Bunched Cables rated 1100 volts and insulated with cross-linked polyethylene and aluminum alloy bare messenger. Description Application a) Suspension Clamp (as per REC For supporting a length of ABC at an Construction standard E-34) intermediate pole in a length, with suitable for bare messenger AB small angle of deviation. cable (35-70 sq mm) 10.1 Cable Data The standard sizes and characteristics of the phase and street lighting conductors, bare messenger wires shall be as specified in IS: and REC Specification 32/1984 of following sizes a) 3x95 (Insulated Phase)+1x70(Bare Messenger)+1x16(Insulated street lighting) sq.mm b) 3x50 (Insulated Phase)+1x35(Bare Messenger)+1x16(Insulated street lighting) sq.mm c) 3x50 (Insulated Phase)+1x35(Bare Messenger) d) 2x50 (Insulated Phase)+1x35(Bare Messenger ) sq.mm GENERAL REQUIREMENTS 1. Suspension clamp shall be made of aluminum alloy of designation 4635 (IS : ) of tensile strength greater than 200 N/mm 2 (20.5 kgf/ mm 2 ) and shall be capable of holding aluminum alloy messenger wire of 35 sq mm or 70 sq mm compacted AAA Conductor. The eye hooks shall be made of forged steel (IS: 2004) or mils steel (IS: 1570). 2. The clamp shall be provided with black weather-resistant plastic coating of at least 1mm thickness to prevent the insulation of the phase conductors from chafing due to rubbing against the clamp. 3. Suspension clamp assembly shall provide sufficient flexibility to allow free movement of the clamp at both straight runs and angle locations. 4. The suspension clamp and hardware shall have good finish and shall be free from all flaws, sharp radii of curvature and the edges shall be suitably rounded off

40 5. All ferrous fittings, eye hooks, bolts, nuts and washers shall be galvanized with Zinc conforming to grade Zn 98 of IS: The spring washers and nuts etc. may be electro-galvanized. Nuts shall be made of material conforming to property Class 4.8 of IS: for its mechanical properties. TEST REQUIREMENTS 1. Slip strength shall not be less than 25% of the tensile strength of the messenger wires of 25mm 2 and 35mm 2 sizes having tensile strengths of 7.4 KN and 10.3 KN respectively (tests to be made separately for the two sizes). 2. Mechanical test Tensile strength at right angle to the direction of messenger wire shall not be less than 15 KN. TESTS The suspension clamp shall be subjected to the following tests in accordance with the latest version of IS:2486 (Part-I). Sampling plan as per clause no 8.0 above. Type Tests Acceptance Tests Routine Tests 1. Slip strength test 1. Verification of dimensions 2. Mechanical test 2. Galvanising test 1.Visual examination test 3. Verification of dimensions 3. Mechanical test 4. Galvanising test 5. Visual examination test NOTES : I. Permissible tolerance shall be ± 5% on the indicated dimensions. II. The supplier of the clamps shall provide necessary facilities at his works for the acceptance tests Marking / Embossing Anchoring Clamp, Suspension clamp should bear - Manufacturers trade mark and logo - Purchaser, NESCO - Product Code or Reference - Traceability Code/Batch Number 10.4 Drawings & Samples: GA drawing and other particulars along with samples are to be submitted along with offer

41 ANCHOR (DEAD END CLAMP) 11.0 Scope This specification covers the design, manufacture, assembly, testing and supply of Accessories for anchoring Aerial Bunched Cables rated 1100 volts and insulated with cross-linked polyethylene and aluminum alloy bare messenger. Description Application a) Dead end Clamp ( as per REC For fitting onto a pole for anchoring Construction standard E-35) the end of a length of ABC, or for a suitable for bare messenger AB major change in direction. cable (35-70 sq mm) 11.1 Cable Data The standard sizes and characteristics of the phase and street lighting conductors, bare messenger wires shall be as specified in IS: and REC Specification 32/1984 of following sizes a) 3x95 (Insulated Phase)+1x70(Bare Messenger)+1x16(Insulated street lighting) sq.mm b) 3x50 (Insulated Phase)+1x35(Bare Messenger)+1x16(Insulated street lighting) sq.mm c) 3x50 (Insulated Phase)+1x35(Bare Messenger) d) 2x50 (Insulated Phase)+1x35(Bare Messenger ) sq.mm GENERAL REQUIREMENTS 1. The Dead End clamp shall be made of high strength Aluminium Alloy of designation 2280 (IS: ) of tensile strength not less than 250 N/mm 2 (27 kgf/mm 2 ). The U-bar shall be made of hot dip galvanised steel. The eye-hooks shall be made of forged steel (IS:2004) or mild steel (IS:1570). 2. The clamp shall be suitable for holding both 35mm 2 and 70mm 2 messenger wire sizes of compacted diameters of 7.62mm and 10.8 mm. 3. The clamp shall have a cone for holding the messenger wire and it shall automatically grip the messenger wire due to tension of the wire. 4. The clamp shall be free from all flaws, irregularities and sharp radii of curvature. 5. All ferrous fittings, eye hooks, bolts, nuts and washers shall be galvanised with Zinc conforming to grade Zn 98 of IS: The spring washers and nuts etc, may be electrogalvanised. Nuts shall be made of material conforming to property class 4.8 of IS:1367 for its mechanical properties

42 TEST REQUIREMENTS 1. Slip strength shall not be less than 90% of the tensile strength of the messenger wires of 35mm² and 70mm² sizes having tensile strengths of 7.4 KN and 10.3 KN respectively (tests to be made separately for the two sizes). 2. The mechanical strength of the Dead End clamp shall not be less than 2000 Kg. The test shall be made separately for the clamp and the eye hook. TESTS The Dead End clamp shall be subjected to the following tests in accordance with the latest version of IS:2486(part-10. Sampling plan shall be as per clause no.08. Type Tests Acceptance Tests Routine Tests a. Slip strength test a. Verification of dimensions a.visual examination test b. Mechanical test b. Galvanising test c. Electrical resistance test c. Mechanical test d. Heating cycle test e. Verification of dimensions f. Galvanising test g. Visual examination test NOTES I. Permissible tolerance shall be ± 5% on the dimensions indicated. II. The supplier of dead-end clamps shall provide necessary facilities at his works for the acceptance tests Marking / Embossing Anchoring Clamp, Suspension clamp should bear - Manufacturers trade mark and logo - Purchaser, NESCO - Product Code or Reference - Traceability Code/Batch Number 11.4 Drawings & Samples: GA drawing and other particulars along with samples are to be submitted along with offer

43 12.0 EYE HOOKS a) Eye hooks shall be of Hot dip GI as per REC construction standard E-35 (Type A) b) It should be made of forged hot dip galvanized steel as per IS-1570 c) The clamp corrosion resistance should conform to standards IS 2629 & IS d) Minimum breaking Load should be 20 KN Type Test a) Mechanical strength b) Galvanizing test 12.2 Acceptance Tests a) Verification of dimensions. b) Galvanizing test c) Minimum breaking load (KN) The Acceptance Tests are to be conducted as per REC Spec. and as per relevant IS Specifications & sampling plan as per clause no.08 above Drawings & Samples: GA drawing, GTP and other particulars along with samples are to be submitted along with offer NEUTRAL CONNECTOR a) The Neutral Connector shall be as per REC Construction standard E-36. b) It should be consist of corrosion resistant extruded Aluminum Alloy body suitable for messenger wire of size (35 70 sq mm) to (35 70 sq mm) /( sq mm). GENERAL REQUIREMENTS 1. The connectors shall be made of aluminium alloy of designation 2280 (IS: ) of tensile strength not less than 300 N/mm 2 (30.5 Kgf/mm 2 ) (Fig. 1). 2. Type A connectors shall be suitable for holding main conductor/tap circular conductors of diameters ranging from 7.62mm to 10.8 mm. 3. Type B connectors shall be suitable for holding main conductors having compacted diameters ranging from 7.62mm to 10.8 mm. and tap services cable conductor diameters ranging from 1.8mm to 10 mm respectively. 4. All ferrous fittings, eye hooks, bolts, nuts and washers shall be galvanized with Zinc conforming to grade Zn 98 of IS: The spring washers and nuts etc. may be electro-galvanized. Nuts shall be made of material conforming to property Class 4.8 of IS: for its mechanical properties. 5. The connectors shall be free from all irregularities, flaws and sharp radii of curvature

44 6. The connector shall be covered by a black weather resistant insulation cover (Fig. 2) made of polyethylene at least 2mm thick to avoid short circuits. TEST REQUIREMENTS i) Rated normal current Type A Type B (refers to tapped current 200A 25A ii) Rated short time current 300 A for 1second 300 A for 1 second iii) Tensile load 110 Kg. 10% of the Breaking Load of cable conductor iii) Resistance Test Electrical resistance shall be conducted as per REC construction standard E-36 (Non tension L.T connectors for tapping of lines and service connections for ABC system). iv) Temperature Rise Test The steady state temperature rise of connector above the reference ambient temperature of 40 C when carrying rated current shall not exceed 45 C. TESTS: Sampling shall be done as per clause 8.0 above. Type Test Acceptance Test Routine Test a) Tensile test a) Tensile test a) Visual examination b) Resistance test b) Resistance test b) Dimensional check c) Temperature rise test c) Temperature rise test d) Short time current test d) Dimensional check e) f) Galvanising test Dimensional check 1. The rated short time current and the temperature rise test shall be made with the largest size of tap conductor for which the connector is intended to be used. 2. a) Tensile load test for type A connector shall be made with maximum and minimum sizes of tap conductors corresponding to the maximum size of main conductor i.e. two separate tests shall be made. b) Tensile load test for type B connectors shall be mad with maximum and minimum sizes of tap conductors/service cables corresponding to maximum and minimum sizes of main conductor i.e. four separate tests shall be made. 3. The resistance test shall hold good for all combinations of main and tap conductors. The number of test samples shall be decided by mutual agreement

45 4. All the above tests shall be carried out in accordance with IS: as amended from time to time. 5. Permissible tolerance shall be ± 5% on the dimensions indicated. NOTE : The supplier of the connectors shall provide necessary testing facilities at his works for the acceptance tests Insulation Cover of LT Connectors are as per Fig;-2 of E Drawings & Samples: GA drawing and other particulars along with samples are to be submitted along with offer

46 GUARANTEED TECHNICAL PARTICULARS FOR INSULATION PIERCING CONNECTOR Sl. No. Description Guaranteed particulars to be submitted by the Bidder along with offer 1 Name and address of the Manufacturer 2 Is Manufacturer of accessories as ISO a) Copies of certificate enclosed b) Are GA drawing enclosed c) Are Samples are submitted 3 Applicable standard 4 Type of connectors 5 Application Is any metallic part carrying potential in operation exposed during installation Are end caps of branch cable a) Slide on type b) Rigid type Are torque limiting shear head provided to tightening bolts Range of cable sizes accommodated for main and branch 10 Min and Max torque defined 11 Torque for establishing connection between main and branch 12 Material used for teeth 13 Surface finish of teeth Maximum tensile load for no breakdown of main conductor(cross section) Max. tensile load on branch conductor for no break/slippage Voltage withstand under water emersion 17 No. of cycles 18 Max temp at each cycle 19 Marking and embossing on the connector

47 GUARANTEED TECHNICAL PARTICULARS FOR SUSPENSION CLAMP FOR BARE MESSENGER WIRE Sl. No. Description Guaranteed particulars to be submitted by the Bidder along with offer 1 Name and address of the manufacturer 2 Applicable standard 3 Type of clamp 4 Type of design 5 Voltage Grade(kV) 6 8 Type & grade (metallic/non-metallic material) Type of hot dip galvanizing & thickness of Zinc coating 9 Marking 10 Colour of non-metallic parts 11 Dimensions 12 Approximate weight 13 Minimum Breaking Load (KN) 14 Maximum allowable load(kn) 15 Max. angle of deviation of conductor (degrees) 16 Method of casting 17 Are GA drawing & samples enclosed

48 GUARANTEED TECHNICAL PARTICULARS FOR DEAD END CLAMP FOR BARE MESSENGER WIRE Sl.. Description Guaranteed particulars to be submitted by the Bidders 1 Name and address of the manufacturer 2 Applicable standard 3 Type of clamp 4 Type of design 5 Voltage Grade(kV) 6 7 Type & grade (metallic/non-metallic material) Type of hot dip galvanizing & thickness of Zinc coating 8 Marking 9 Colour of non-metallic parts 10 Dimensions 11 Approximate weight 12 Ultimate tensile strength(kn) 13 Maximum allowable load(kn) 14 Slip Strength (KN) 15 Method of casting 16 Operating temperature (deg.cent) a) Continuous Operation b) Short circuit condition 17 Are GA drawing & samples enclosed

49 GUARANTEED TECHNICAL PARTICULARS FOR NEUTRAL CONNECTOR FOR BARE MESSENGER WIRE Sl. No. Description Name and address of the 1 manufacturer 2 Applicable standard 3 Type of clamp 4 Type of design 5 Voltage Grade(kV) 6 Dimensions 7 Approximate weight 8 Minimum Breaking Load (KN) 9 Maximum allowable load(kn) 10 Method of casting Are GA drawing & samples enclosed 11 Guaranteed particulars to be submitted by the Bidders Guaranteed Technical Particulars of Eye Hook Sl. No. Description Guaranteed Technical Particulars submitted by the bidder 1 Name and Address of the Manufacturer 2 Type of Hooks 3 Type of Hot Dip Galvanizing Thickness of Zinc Coating 4 Dimensions in mm 5 Net Weight in Kg 6 Ultimate tensile strength 7 Are GA drawing & samples enclosed

50 33. Danger Board TECHNICAL SPECIFICATION OF DANGER NOTICE PLATE : a) The danger plate shall be affixed in a permanent manner on operating side of the panel, Substations, Distribution Boards, Electric poles etc.. b) The danger notice plate shall indicate danger notice both in English and Odiya, English & Hindi and with a sign of skull and bones. c) The danger notice plate in general shall meet to requirements of local inspecting authorities. d) Dimension of the danger notice I) For display at 415 V installations 200x150mm II) For display at 11 KV / 33KV (or higher voltages) installations 250x200mm III) The corners of the plate shall be rounded off. e) The danger notice plate shall be made from minimum1.6 mm thick mild steel sheet and after due pre-treatment to the plate, the same shall be painted white with vitreous enamel paint on both front and rear surface of the plate. f) The letter, the figure, the conventional skull and bones shall etc. shall be positioned on the plate as per recommendations of IS : g) The said letter, the figure and the sign of skull and bones be painted in single red colour as per IS : h) Standards of Danger Plate: The Danger Notice Plates shall comply with IS: or the latest amendment. i) The danger notice plate, if possible, be of ISI certification mark. j) The danger plate should be as per drawing enclosed or better look. k) Tests of Danger Plate: The following tests shall be carried out : I) Visual examination as per IS: II) Dimensional check as per IS: III) Test for weather proofness as per IS: (or its latest version) GTP of LV/ 11KV/ 33 KV DANGER BOARD Sl.No. Particulars Specified Bidders Offer 1 Design of Danger plate shall be as per IS: 2551/ Letters and Bone skulls marks Red Vitreous Enameled

51 Background White Vitreous Enameled 4 Back Side Black Vitreous Enameled 5 Material 1.6mm Thick Mild Steel Plate 6 Letter Language Oriya / English / Hindi 7 2 nos of 2mm Thick lead washer and 2 nos of 6mm dia. Bolts and Nuts to be supplied with each number plate. 8 Drawing Enclosed 34. Barbed Wire TECHNICAL SPECIFICATION FOR G.I. BARBED WIRE 1.SCOPE: The specification covers design, manufacture, shop testing, packing and delivery of G.I. Barbed wire at the stores/ sites of NESCO 2.STANDARDS: Unless otherwise specified elsewhere in this specification, the rating as well as performance and testing of the G.I.Barbed wire shall conform to the latest revisions available at the time of placement of order of all the relevant standards but not limited to as listed below. IS:280:1978 IS:1340:1977 Mild steel wire for general engineering purposes (third revision) Code of practice for chromate conversion coating of zinc and cadmium coated articles and zinc base alloys (first revision) IS:1521:1972 Method for tensile testing of steel wire (first revision) IS:1755:1983 Method for wrapping test for metallic wire (first revision) IS:2633:1986 Method for testing uniformity of coating of zinc coated articles(second revision) IS:4826:1979 Hot dipped galvanized coating on round steel wires (first revision) IS:12753:1989 Electro galvanized coatings on round steel wire - Specification 3. GENERAL TECHNICAL REQUIREMENTS: GI Barbed wire shall be 2 PLY with a 2.5mm diameter. The barbs shall have a 2mm diameter and be 12.5mm in length. The barbs shall have four points and shall be formed by twisting two point wires, each two turns, tightly around both line wires making altogether four complete turns (see Fig. 1). G.I. Barbed wire shall be of type IOWA (Type A in the fig. below) with size and dimensions as under:- Line wire mm Point wire mm Distance between two bars shall be 75 mm ( + 12 mm ). Wire shall be medium However, other specific technical particulars shall be as per Annexure- I

52 ANNEXURE-I SPECIFIC TECHNICAL PARTICULARS FOR 2.5 MM X 2.0 MM G.I.BARBED WIRE Sl.No. Particulars Particulars Specified Bidders Offer 1 Size of wire- mm Line wire- 2.5 mm mm Point wire- 2.0 mm mm 2 Type of Barbed Wire Iowa Type 3 Tensile strength of line 390 to 590 N/mm² wire 4 Minimum breaking load 3.7 KN of completed Barbed wire 5 Mass of complete 115 gms / Mtr. Barbed wire (minimum) 6 Distance between two ( ) mm Barbs 7 No. of lays between the 4 Barbs ( minimum ) 8 Method of Galvanising Hot dipped according to IS:4826 /1979 with medium coating. 9 Mass of coating (minimum) Line wire- 110 gms/mtr² Point wire- 105 gms/mtr² ( testing after barbing ) 10 No. of dips the wire is ( testing after barbing ) able to withstand without copper coating A) For Line Wire 2 dip in Min B) For Point Wire 2 dip in Min