1.1_KV PVC insulated PVC sheathed multicore Aluminium Cable (armoured & unarmoured)

Transcription

1 WEST BENGAL STATE ELECTRICITY DISTRIBUTION COMPANY LIMITED (A Govt. of West Bengal Enterprise) Office of the Chief Engineer, Procurement & Contracts Department Vidyut Bhavan, 4 th. floor, Bidhannagar, Kolkata Technical Specification for 1.1_KV PVC insulated PVC ed multicore Aluminium Cable (armoured & unarmoured) 1

2 Technical specification for 1.1_KV PVC insulated PVC ed multicore Aluminium Cable (armoured & unarmoured) 1.0 SCOPE : This specification covers design, manufacture, testing at manufacturer s works before despatch, transportation, supply and delivery of grade PVC insulated PVC ed multicore Aluminium Cable. 2.0 LOCATION : A. grade 2 Core 4 sq.. & 6 sq.. PVC unarmoured Cables The Cable are used for overhead service connection purpose under working voltage upto & including 1100 Volts suitable for LV side of distribution Transformer, any other LV use in 3 Phase earthed system. B. grade 4 Core PVC armoured Cables of all sizes The Cable shall be laid/buried directly in ground anywhere in West Bengal and terminated for outdoor connection. The Cables may be laid within covered Cable Trenches in Cable Racks/Ladder/open Air etc. for certain portion of length. The above mentioned cables will be used within the State of West Bengal under WBSEDCL area. 3.0 STANDARD The materials covered under this specification shall comply with the requirements of the latest version of the following standards as amended up to date, except where specified otherwise. i) IS: IS: IS : 1554(Part-I) : 1988 iv) IS: 3961(Part-II)-1967 v) IS: vi) v IS: IS: : Specification for Conductors for insulated electric cables and flexible cords : Specification for PVC insulation & of electric cables : Specification for PVC Insulated heavy duty Electric Cables for working Voltage upto & including 1100 Volt Recoended current rating for PVC insulated and PVC ed heavy duty Cables : Specification for Low Carbon Galvanized steel wires, Formed Wires and tapes for armouring of Cables. : Methods of test for Cables. : Specification for Drums for Electric Cables. 4.0 CLIMATIC AND ISOCERAUNIC CONDITIONS: Maximum ambient temperature C Minimum ambient temperature C Thermal resistance of soil C cm/watt Maximum daily average ambient temperature: 45 0 C Maximum relative humidity- 100% Average rainfall per annum-200 cm Maximum height above the sea level meter Maximum wind pressure/wind speed: 150 kg/sq. m/50m/sec Average no. of thunderstorm days per annum: RATED VOLTAGE: The rated voltage of the cables shall be 1100 V. 2

3 6.0 CABLE SIZE & DATA A) grade unarmoured PVC insulated PVC ed 2 Core Aluminium Cable Sl. No Item Description Aluminium Conductor Minimum No. of Strand Maximum DC Resistance of Conductor at 20 0 C (Ohm/KM) Nominal of Insulation Minimum of inner Nominal of outer Minimum of outer Continuous Current Carrying capacity in air at 40 0 C ambient Cable Code 1 PVC Cable 2 C X 4 sq. 2 2 Core 6 sq. (noncompacted), H4 grade with flexibility class A AYY A AYY B) Grade armoured PVC insulated PVC ed 4 Core Aluminium Cable Cable size Aluminium Conductor 4 Core 10 (noncompacted) sq., H4 grade with flexibility class 2 4 Core 25 sq. Minimun No. of Strand Maximum DC Resistance of Conductor at 20 0 C (Ohm/KM) Nominal of Insulation Minimum of inner Armour Galvanized Galvanized Nominal dimensions of Armour Maximum DC resistance of Armour of Cable at 20 0 C (Ohm/KM) Minimum of outer Continuous Current Carrying capacity in air at 40 0 C ambient Continuous Current Carrying capacity in ground at 30 0 C Cable Code A 46A AYFY A 76A AYFY 4 Core 50 sq Galvanized A 110 A AYFY 4 Core 120 sq. 4 Core 185 sq. compacted, H4 grade with flexibility class Galvanized Galvanized A 185 A AYFY A 235 A AYFY 4 Core 300 sq Galvanized A 305 A AYFY 4 Core 400 sq Galvanized A 335 A AYFY 7.0 CONDUCTORS : Aluminium conductors shall be H4 grade with flexibility class 2 complying with the requirements as specified in IS with latest amendments. The Conductors shall be (non-compacted) for Cross Section of 4 sq.., 6 sq.. & 10 sq.. Conductors shall be compacted for Cross Section above 10 sq.. The conductor shall be clean & reasonably uniform in size and shape and its surface shall be free from sharp edges. 3

4 8.0 INSULATION : The Conductor shall be provided with PVC insulation applied by extrusion. Type of insulation shall be A for general purpose PVC. Maximum permissible Conductor temperature should be 70 0 C under normal continuous operation & should be C under short circuit condition. 9.0 LAYING UP OF CORES In twin, three & multi core cables, the cores shall be laid up together with a suitable lay, the outermost layer shall have right hand lay and the successive layer shall be laid with opposite lay INNER SHEATH : The laid up cores shall be provided with Inner Sheath applied by extrusion. It shall be ensured that the shape of Cable is as circular as possible. Inner shall be so applied that it fits closely on the laid up cores and it shall be possible to remove it without damaging the insulation. For Cables with general purpose insulation, the inner shall be of type ST1 PVC Compound conforming to the requirements of IS: with latest amendments ARMOURING (for Armoured Cable only): The armour wires/strips shall be applied as closely as practicable. A binder tape may be provided on the armour. The joints in armour wire or strip shall be made by brazing or welding and the surface irregularities shall be removed. A joint in any wire/strip shall be at least 300 from the nearest joint in any other armour wire/flat strip in the completed cable. Where the calculated dia. below armouring does not exceed 13, the armour shall consist of round wires. Where the calculated dia. below armouring exceeds 13, the armour shall consist of flat strips. For flat strips armour nominal dimensions of armour should be 4. X 3.4. X OUTER SHEATH : The outer shall be applied by extrusion over the inner in case of unarmoured cable & over the armouring in case of armoured Cable. The colour of outer is black unless otherwise specified. Thickness of outer should be as per IS: 1554 (Part-I): 1988 with latest amendment. For Cables with general purpose insulation, the outer shall be of type ST1 PVC Compound conforming to the requirements of IS: with latest amendments CLASSIFICATION OF TESTS Type Test Report During bid submission, the bidder shall submit Type Test report for each offered item. Type Test should be carried out i) Within 5 years from the due date of opening of tender. From CPRI or ERDA or NABL accredited LAB bearing NABL Logo. Accreditation of NABL LAB should be displayed in the official website of NABL. As per IS: 1554(Part-1)-1988 and it latest amendment and other relevant IS. All the tests mentioned below are to be made as per details given in IS: The following shall constitute type Test: a) Resistance Test on Conductor b) Tests for armouring Wires/strips (for Armoured Cable). c) Test for of insulation and d) Physical tests for insulation and outer 4

5 i) Tensile strength and elongation at break iv) Ageing in air oven Shrinkage test Hot deformation v) Loss of mass in air oven vi) v Heat shock test Thermal stability test e) Insulation resistance Test f) High voltage test (water iersion test) g) High voltage test at room temperature h) Flaability test ACCEPTANCE TEST: The following shall constitute acceptance Test: a) Resistance Test on Conductor b) Test for of insulation and c) Tensile strength and elongation at break test of insulation &. d) Insulation resistance Test e) High voltage test at room temperature. ROUTINE TEST: The following shall constitute routine test: a) Resistance Test on Conductor b) High voltage test at room temperature 14.0 CABLE IDENTIFICATION & SEQUENTIAL LENGTH MARKING: Cable identification by embossing: The following shall be embossed on the outer of the cable throughout the length of cable at 1.0 meter spacing for identification: i) Manufacturer s Name or Trade Mark Name of the purchaser : WBSEDCL or WBSEDCL/DDUGJY or WBSEDCL/IPDS (as applicable) Voltage Grade of Cable (1100 V) iv) Type of insulation, material of conductor (PVC insulated Aluminium conductor) v) Number of cores & nominal cross sectional area of conductor vi) Cable Code v Marking Electric. v Month & Year of manufacture Sequential length marking by printing Sequential length shall be marked on the outer of the cable throughout the length by Printing in each meter length interval. 5

6 14.0 PACKING & DRUM DETAILS: The Cable shall be supplied in non-returnable wooden drums having drum length as mentioned below with tolerance of + 5% per drum subject to overall maximum minus (-) 1% on total quantity will be accepted. Cable Size A) grade unarmoured PVC insulated PVC ed 2 Core Aluminium Cable Drum Length 2 Core 4 sq % 2 Core 6 sq. B) grade armoured PVC insulated PVC ed 4 Core Aluminium Cable 4 Core 10 sq % 4 Core 25 sq. 4 Core 50 sq. 4 Core 120 sq. 4 Core 185 sq % 4 Core 300 sq. 4 Core 400 sq. The drums shall be proofed against attack by white ant or termite, conforming to IS:10418:1982. The clearance between the outermost layer of the cable & the edge of the flange should be at least 75 or equal to the diameter of the Cable whichever is less SEALING OF CABLE ENDS : The ends of the cable shall be sealed with heat shrinkable caps MARKING ON EACH DRUM The following information shall be stenciled on each drum: a) Reference to this Indian Standard, for example, Ref IS:1554(Part-I) b) Manufacturer s Name, brand name or Trade Mark c) Type of Cable and Voltage Grade Example - grade PVC insulated PVC ed Aluminium Cable (armoured/unarmoured) d) Number of cores e) Nominal cross sectional area of Conductor f) Cable Code g) Length of Cable on the Drum h) Number of length on the drum(if more than one) i) Direction of rotation of Drum by means of arrow. j) Approximate gross weight & tare weight k) Running end of Cable l) Country of Manufacture m) Month & Year of manufacture n) License Number o) Serial number of the Drum p) Name of the purchaser : WBSEDCL or WBSEDCL/DDUGJY or WBSEDCL/IPDS (as applicable). q) Purchase Order No. & Date 6

7 GUARANTEED TECHNICAL PARTICULARS for Grade of size 2Cx4 sq.. & 2Cx6 sq.. Sl. No. Name of the Article Guaranteed Particulars Name of the Manufacturer Factory Address 2 Core 4 sq. 2 Core 6 sq.. 1 CABLE Code AYY AYY 2 RATED VOLTAGE Working Voltage up to and including 1100 Voltage Working Voltage up to and including 1100 Voltage 3 Applicable Standard IS: , IS: , IS : 1554(Part-I) : 1988, IS: 3961(Part-II)-1967, IS: & IS: All the IS with latest amendments 4 Conductor i) Material H4 Grade Aluminium wires with flexibility Class 2 as per IS: 8130 H4 Grade Aluminium wires with flexibility Class 2 as per IS: 8130 Shape of Conductor non-compacted circular non-compacted circular Maximum DC Resistance of Conductor at 20 0 C (Ohm/KM) iv) Nominal Area of Cross Section (sq. ) v) No. of Strand vi) Strand Dia. in 5 Insulation 4 sq. 6 sq. i) Material Extruded PVC Type 'A' of IS: with latest amendment Extruded PVC Type 'A' of IS: with latest amendment Nominal of Insulation Suitability with regard to temp, moisture, Acid, Oil & Alkaline Surrounding Yes Yes 6. Inner Sheath i) Material Extruded PVC type (ST-1) as per IS: 5831 : 84 with latest Amendment Extruded PVC type (ST-1) as per IS: 5831 : 84 with latest Amendment Minimum of inner () Outer i) Material Extruded Black PVC type (ST-1) as per IS: 5831 : 84 with latest Amendment Extruded Black PVC type (ST-1) as per IS: 5831 : 84 with latest Amendment Minimum of outer Nominal of outer () 8 Overall minimum dia of Cable () 9 Method of Core identification As PER IS:1554 (Part-I) 1988 with latest amendments As PER IS:1554 (Part-I) 1988 with latest amendments 10 Maximum operating temperature of Conductor 70 0 C 11 Maximum temperature of conductor during short circuit C 7

8 12 Drum length & tolerance of each drum 13 Overall tolerance in total quantity 14 Continuous Current Carrying capacity in air at 40 0 C 500+5% -1% 27 A 35 A 15 Sealing of cable ends The ends of the cable shall be sealed with heat shrinkable caps 16 Approximate net weight of Cable (Kg./KM) 17 Cable identification & sequential length marking Cable identification by Embossing The following shall be embossed on the outer of the cable throughout the length of cable at 1.0 meter spacing for identification: i) Manufacturer s Name or Trade Mark iv) Name of the purchaser : WBSEDCL or WBSEDCL/DDUGJY or WBSEDCL/IPDS (as applicable) Voltage Grade of Cable Type of insulation, material of conductor v) Number of cores & nominal cross sectional area of conductor vi) v v Cable Code Marking Electric. Month & Year of manufacture Sequential length marking by printing Sequential length shall be marked on the outer of the cable throughout the length by Printing in each meter length interval. 18 Marking on each drum The following information shall be stenciled on each drum: a) Reference to this Indian Standard, for example, Ref IS:1554(Part-I) b) Manufacturer s Name, brand name or Trade Mark c) Type of Cable and Voltage Grade Example - grade PVC insulated PVC ed Aluminium Cable (armoured/unarmoured) d) Number of cores e) Nominal cross sectional area of Conductor f) Cable Code g) Length of Cable on the Drum h) Number of length on the drum(if more than one) i) Direction of rotation of Drum by means of arrow. j) Approximate gross weight & tare weight k) Running end of Cable l) Country of Manufacture m) Month & Year of manufacture n) License Number o) Serial number of the Drum p) Name of the purchaser : WBSEDCL or WBSEDCL/DDUGJY or WBSEDCL/IPDS (as applicable). q) Purchase Order No. & Date 8

9 GUARANTEED TECHNICAL PARTICULARS for Grade 4Core of size 10 sq..,25 sq.,50 sq., 120 sq., 185 sq., 300 sq.. & 400 sq. Sl. No. Name of the Article Guaranteed Particulars 4CX10 sq. 4CX25 sq. 4CX50 sq. 4CX120 sq. 4CX185 sq. 4CX300 sq. 4CX400 sq. Name of the Manufacturer Factory Address 1 CABLE Code AYFY AYFY AYFY AYFY AYFY AYFY AYFY 2 RATED VOLTAGE Working Voltage up to and including 1100 Voltage 3 Applicable Standard IS: , IS: , IS : 1554(Part-I) : 1988, IS: 3961(Part-II)-1967, IS: , IS: & IS: All the IS with latest amendments 4 Conductor i) Material H4 Grade Aluminium wires with flexibility Class 2 as per IS: 8130 Shape of Conductor non- Maximum DC Resistance of Conductor at 20 0 C (Ohm/KM) iv) Nominal Area of Cross Section (sq. ) v) No. of Strand vi) Strand Dia. in 5 Insulation i) Material Extruded PVC Type 'A' of IS: with latest amendment Nominal of Insulation Suitability with regard to temp, moisture, Acid, Oil & Alkaline Surrounding Yes 6. Inner Sheath i) Material Extruded PVC type (ST-1) as per IS: 5831 : 84 with latest Amendment Minimum of inner () Armour i) Armouring material Galvanized Steel Strip Nominal dimensions of Armour 4X3.4X0.8 Maximum DC resistance of Armour of Cable at 20 0 C (Ohm/KM) 8 Outer i) Material Extruded Black PVC type (ST-1) as per IS: 5831 : 84 with latest Amendment Minimum of outer 9 Overall minimum dia of Cable () Method of Core identification As PER IS:1554 (Part-I) 1988 with latest amendments 11 Maximum operating temperature of Conductor 70 0 C 9

10 12 Maximum temperature of conductor during short circuit 13 Drum length & tolerance of each drum 14 Overall tolerance in total quantity 15 Continuous Current Carrying capacity in air at 40 0 C 16 Continuous Current Carrying capacity in ground at 30 0 C C 500+5% 500+5% 250+5% 250+5% 250+5% 250+5% 250+5% -1% 40 A 70 A 105 A 180 A 240 A 315 A 375 A 46 A 76 A 110 A 185 A 235 A 305 A 335 A 17 Sealing of cable ends The ends of the cable shall be sealed with heat shrinkable caps 18 Approximate net weight of Cable 19 Cable identification & sequential length marking Cable identification by Embossing The following shall be embossed on the outer of the cable throughout the length of cable at 1.0 meter spacing for identification: i) Manufacturer s Name or Trade Mark iv) Name of the purchaser : WBSEDCL or WBSEDCL/DDUGJY or WBSEDCL/IPDS (as applicable) Voltage Grade of Cable Type of insulation, material of conductor v) Number of cores & nominal cross sectional area of conductor vi) v v Cable Code Marking Electric. Month & Year of manufacture Sequential length marking by printing Sequential length shall be marked on the outer of the cable throughout the length by Printing in each meter length interval. 20 Marking on each drum The following information shall be stenciled on each drum: a) Reference to this Indian Standard, for example, Ref IS:1554(Part-I) b) Manufacturer s Name, brand name or Trade Mark c) Type of Cable and Voltage Grade Example - grade PVC insulated PVC ed Aluminium Cable (armoured/unarmoured) d) Number of cores e) Nominal cross sectional area of Conductor f) Cable Code g) Length of Cable on the Drum h) Number of length on the drum(if more than one) i) Direction of rotation of Drum by means of arrow. j) Approximate gross weight & tare weight k) Running end of Cable l) Country of Manufacture m) Month & Year of manufacture n) License Number o) Serial number of the Drum p) Name of the purchaser : WBSEDCL or WBSEDCL/DDUGJY or WBSEDCL/IPDS (as applicable). q) Purchase Order No. & Date 10