2017 NEC Significant Code Changes Part 2

Transcription

1 2017 NEC Significant Cde Changes Part 2 Fur (4) Cntinuing Educatin Hurs Curse Apprval #EE1002 Apprved Cntinuing Educatin fr Prfessinal Engineers 2017 NEC Significant Cde Changes Part 2 i

2 Table f Cntents 2017 NEC Significant Cde Changes Part 2 Intrductin 1 Chapter 4 Equipment fr General Use... 2 Article 404 Switches... 2 Article 406 Receptacles, Crd Cnnectrs, and Attachment Plugs (Caps)... 3 Article 408 Switchbards, Switchgear, and Panelbards... 6 Article 409 Industrial Cntrl Panels... 7 Article 410 Luminaires, Lamphlders, and Lamps... 7 Article 411 Lighting Systems Operating at 30 Vlts r Less and Lighting Equipment Cnnected t Class-2 Pwer Surces8 Article 422 Appliances... 8 Article 424 Fixed Electric Space-Heating Equipment Article 425 Fixed Resistance and Electrde Industrial Prcess Heating Equipment Article 426 Fixed Outdr Electric Deicing and Snw- Melting Equipment Article 430 Mtrs, Mtr Circuits, and Cntrllers Article 440 Air-Cnditining and Refrigerating Equipment Article 445 Generatrs Article 480 Strage Batteries Access the Cde Quiz Questins NEC Significant Cde Changes Part 2 ii

3 2017 NEC Significant Cde Changes Part 2 LEARNING OBJECTIVES Upn cmpletin f this curse the student will be able t: 1. Becme familiar with sme f the significant changes including additins, deletins, and mdificatin t the 2017 Editin f NFPA 70: Natinal Electrical Cde (NEC) frm the 2014 Editin. 2. Cmprehend, after reviewing the significant changes and additins t the 2017 Editin f NFPA 70: Natinal Electrical Cde (NEC) the large scpe f the changes t the cde, thereby seeking additinal and mre thrugh reviews f the entire cde, fllwing cmpletin f this curse. INTRODUCTION Every three years, the Natinal Electrical Cde (NEC ) is revised and expanded. Initially the NFPA received 4,012 public suggestins fr changes, which resulted in 1,235 first revisins. There were 1,513 public cmments submitted in respnse t these 1,235 first revisins, resulting anyne participating in the electrical industry t get up t speed with all the changes. What t Expect In this curse the student will be presented an verview f the mst significant changes fund in the 2017 NEC. This is part 2 f a series f curses cvering the changes and will prgress thrugh each chapter and its articles presenting the many imprtant changes. The changes will be highlighted fr easy recgnitin and a shrt synpsis f the reasn fr the change is presented as well. in 559 secnd revisins. Changes included editrial clarificatin, expanded requirements, new requirements, deleted requirements, and the relcatin f ther requirements. Nine new articles were prpsed, and five new articles were added t the 2017 NEC. With the fast pace f technlgy, it s mre imprtant than ever fr 2017 NEC Significant Cde Changes Part 2 1

4 Large-Scale Phtvltaic (PV) Electric Pwer Prductin Facility (New Article 691) cvers systems that prduce at least 5 megawatts (MW) f pwer, r enugh t pwer 800+ U.S. hmes. Energy Strage Systems (New Article 706) gverns ESS installatin, discnnectin, shutdwn, and safety labeling. Stand-Alne Systems (New Article 710) cvers pwer prductin surces that are nt cnnected t the grid, including PV and wind-pwered systems. Direct Current Micrgrids (New Article 712) cncerns independent energy distributin netwrks that allw the utilizatin f pwer frm dc surces t direct-current lads. Micrgrids are n the rise wrldwide CHAPTER 4 EQUIPMENT FOR GENERAL USE ARTICLE 404 Switches 404.2(C) Switch Cnnectins (C) Switches Cntrlling Lighting Lads. The grunded circuit cnductr fr the cntrlled lighting circuit shall be prvided installed at the lcatin where switches cntrl lighting lads that are supplied by a grunded general-purpse branch circuit serving bathrms, hallways, stairways, r rms suitable fr human habitatin r ccupancy as defined in the applicable building cde. Where multiple switch lcatins cntrl the same lighting lad such that the entire flr area f the rm r space is visible frm the single r cmbined switch lcatins, the grunded circuit cnductr shall nly be required at ne lcatin. fr ther than the fllwing A grunded cnductr shall nt be required t be installed at lighting switch lcatins under any f the fllwing cnditins: (1) Where cnductrs enter the bx enclsing the switch thrugh a raceway, prvided that the raceway is large enugh fr all cntained cnductrs, including a grunded cnductr (2) Where the bx enclsing the switch is accessible fr the installatin f an additinal r replacement cable withut remving finish materials (3) Where snap switches with integral enclsures cmply with (E) (4) Where a switch des nt serve a habitable rm r bathrm [mved t parent text f 404.2(C)] (5) Where multiple switch lcatins cntrl the same lighting lad such that the entire flr area f the rm r space is visible frm the single r cmbined switch lcatins [mved t parent text f 404.2(C)] (6) (4) Where lighting in the area is cntrlled by autmatic means (7) (5) Where a switch cntrls a receptacle lad The grunded cnductr shall be extended t any switch lcatin as necessary and shall be cnnected t switching devices that require line-t-neutral vltage t perate the electrnics f the switch in the standby mde and shall meet the requirements f Exceptin: The cnnectin requirement shall becme effective n January 1, It shall nt apply t replacement r retrfit switches installed in lcatins prir t lcal adptin f 404.2(C) and where the grunded cnductr cannt be extended withut remving finish materials. The number f electrnic lighting cntrl switches n a branch circuit shall nt exceed five, and the number cnnected t any feeder n the lad side f a system r main bnding jumper shall nt exceed 25. Fr the purpse f this exceptin, a neutral busbar, in cmpliance with 200.2(B) and t which a main 2017 NEC Significant Cde Changes Part 2 2

5 r system bnding jumper is cnnected shall nt be limited as t the number f electrnic lighting cntrl switches cnnected. Infrmatinal Nte: The prvisin fr a (future) grunded cnductr is t cmplete a circuit path fr electrnic lighting cntrl devices. Reasn fr the Change The previus seven cnditins in which a grunded cnductr was nt required t be installed at lighting switch lcatins has been revised and reduced t nly five cnditins. Previus cnditins (4) and (5) were mved t the parent text f 404.2(C) and rewrded int psitive language. Enfrceable language was added t require the grunded cnductr t be cnnected and used by the switching device rather than simply be present at the switch enclsure. A new exceptin was als added t exclude replacement r retrfit switches installed in lcatins befre the lcal adptin f 404.2(C) where the grunded cnductr cannt be extended withut remving finish materials. This new exceptin als puts a limit t the number f electrnic lighting cntrl switches n a branch circuit r feeder Branch-Circuit Vltage Limitatins Electrnic Lighting Cntrl Switches. Electrnic lighting cntrl switches shall be listed. Electrnic lighting cntrl switches shall nt intrduce current n the equipment grunding cnductr during nrmal peratin. The requirement t nt intrduce current n the equipment grunding cnductr shall take effect n January 1, Exceptin: Electrnic lighting cntrl switches that intrduce current n the equipment grunding cnductr shall be permitted fr applicatins cvered by 404.2(C), Exceptin. Electrnic lighting cntrl switches that intrduce current n the equipment grunding cnductr shall be listed and marked fr use in replacement r retrfit applicatins nly. Reasn fr the Change In cnjunctin with revisins t 404.2(C), new text was added at stating that electrnic lighting cntrl switching devices are required t be listed and shall nt intrduce current n the equipment grunding cnductr during nrmal peratin. This prhibitin n intrducing current n the equipment grunding cnductr has a future effective date f January 1, ARTICLE 406 Receptacles, Crd Cnnectrs, and Attachment Plugs Receptacles, Crd Cnnectrs, and Attachment Plugs (Caps) Outlet Bx Hd. A husing shield intended t fit ver a faceplate fr flushmunted wiring devices, r an integral cmpnent f an utlet bx, r a faceplate fr flush-munted wiring devices. The hd des nt serve t cmplete the electrical enclsure; it reduces the risk f water cming in cntact with electrical cmpnents within the hd, such as attachment plugs, current taps, surge prtective devices, direct plug-in transfrmer units, r wiring devices. Reasn fr the Change A clear and expressive definitin fr the term utlet bx hd was added at (E) Receptacle Rating and Type (E) Cntrlled Receptacle Marking. All nnlcking-type, 125-vlt, 15- and 20-ampere receptacles that are cntrlled by an autmatic cntrl device, r that incrprate cntrl features that remve pwer frm the receptacle utlet fr the purpse f energy management r building autmatin, shall be marked with the symbl shwn in Figure 406.3(E) and the wrd cntrlled. Fr receptacles cntrlled by an autmatic cntrl device, the marking shall be lcated n 2017 NEC Significant Cde Changes Part 2 3

6 the cntrlled receptacle utlet face where and visible after installatin. In bth cases where a multiple receptacle device is used, the required marking f the wrd cntrlled and symbl shall dente which cntact device(s) are autmatically cntrlled. Figure 406.3(E) Cntrlled Receptacle Marking Symbl Exceptin: The marking is nt required fr receptacles cntrlled by a wall switch that prvide the required rm lighting utlets as permitted by Reasn fr the Change The wrd Cntrlled is nw required t be placed n the cntrlled receptacle alng with the previus symbl. The wrd Cntrlled was als added t Figure 406.3(E). The cntrlled receptacle symbl and the wrd Cntrlled are t be placed n the cntrlled receptacle face (nt the faceplate r cver) and visible after installatin (F) Receptacle Rating and Type (F) Receptacle with USB Charger. A 125-vlt 15- r 20-ampere receptacle that additinally prvides Class 2 pwer shall be listed and cnstructed such that the Class 2 circuitry is integral with the receptacle. Reasn fr the Change New prvisins were added pertaining t 125-vlt 15- r 20-ampere receptacle that additinally prvides Class 2 pwer in the frm f a USB charger. These new prvisins require these devices t be listed and cnstructed such that the Class 2 circuitry is integral with the receptacle (D)(4), Ex. N. 1 and Ex. N. 2 General Installatin Requirements (4) Arc-Fault Circuit-Interrupter Prtectin. Where a receptacle utlet is supplied by a branch circuit that requires arcfault circuit-interrupter prtectin as specified elsewhere in this Cde lcated in any areas specified in (A) r (B), a replacement receptacle at this utlet shall be ne f the fllwing: (1) A listed utlet branch-circuit type arc-fault circuit-interrupter receptacle (2) A receptacle prtected by a listed utlet branch-circuit type arc-fault circuit-interrupter type receptacle (3) A receptacle prtected by a listed cmbinatin type arc-fault circuit-interrupter type circuit breaker Exceptin N. 1: Arc-fault circuitinterrupter prtectin shall nt be required where all f the fllwing apply: (1) The replacement cmplies with 406.4(D)(2)(b). (2) It is impracticable t prvide an equipment grunding cnductr as prvided by (C). (3) A listed cmbinatin type arc-fault circuitinterrupter circuit breaker is nt cmmercially available. (4) GFCI/AFCI dual functin receptacles are nt cmmercially available. Exceptin N. 2: Sectin (B), Exceptin shall nt apply t replacement f receptacles. This requirement becmes effective January 1, Reasn fr the Change The main requirement f AFCI prtectin at replacement receptacles as described in the 2014 NEC hlds true with tw new exceptins added. The first new exceptin recgnizes applicatins where an existing tw-wire receptacle is replaced and n equipment grunding cnductr can be installed. The secnd new exceptin stipulates that the exceptin t (B) des nt apply when replacing existing receptacles NEC Significant Cde Changes Part 2 4

7 406.4(D)(5) General Installatin Requirements (5) Tamper-Resistant Receptacles. Listed tamper-resistant receptacles shall be prvided where replacements are made at receptacle utlets that are required t be tamper-resistant elsewhere in this Cde, except where a nn-grunding receptacle is replaced with anther nngrunding receptacle. Reasn fr the Change 406.4(D)(5) still requires listed tamperresistant receptacles where replacements are made at receptacle utlets that are required t be tamper-resistant elsewhere in the Cde except where a nn-grunding receptacle is replaced with anther nngrunding receptacle. The tamper-resistant receptacle requirements at remained basically the same fr dwelling units, guest rms and guest suites f htels and mtels, and fr a child care facility (D) Receptacle Faceplates (Cver Plates) (D) Receptacle Faceplate (Cver Plates) with Integral Night Light and/r USB Charger. A flush device cver plate that additinally prvides a night light and/r Class 2 utput cnnectr(s) shall be listed and cnstructed such that the night light and/r Class 2 circuitry is integral with the flush device cver plate. Reasn fr the Change New requirements were added at 406.6(D) abut receptacle faceplates with integral night lights and/r USB chargers. These faceplates must be listed and cnstructed such that the night light and/r Class 2 circuitry is integral with the flush device cver plate (B)(1) Receptacles in Damp r Wet Lcatins (1) Receptacles f 15 and 20 Amperes in a Wet Lcatin. Receptacles f 15 and 20 amperes, 125 and 250 vlts installed in a wet lcatin shall have an enclsure that is weatherprf whether r nt the attachment plug cap is inserted. An utlet bx hd installed fr this purpse shall be listed and shall be identified as extra duty. Other listed prducts, enclsures, r assemblies prviding weatherprf prtectin that d nt utilize an utlet bx hd need nt be marked extra duty. Infrmatinal Nte N. 1: Requirements fr extra-duty utlet bx hds are fund in ANSI/UL 514D , Cver Plates fr Flush-Munted Wiring Devices. Extra duty identificatin and requirements are nt applicable t listed receptacles, faceplates, utlet bxes, enclsures, r assemblies that are identified as either being suitable fr wet lcatins r rated as ne f the utdr enclsure-type numbers f Table that des nt utilize an utlet bx hd. Exceptin: 15- and 20-ampere, 125- thrugh 250-vlt receptacles installed in a wet lcatin and subject t rutine high-pressure spray washing shall be permitted t have an enclsure that is weatherprf when the attachment plug is remved. All 15- and 20-ampere, 125- and 250-vlt nnlcking-type receptacles shall be listed and s identified as the weather-resistant type. Infrmatinal Nte N. 2: The types cnfiguratin f weatherresistant receptacles cvered by this requirement are identified as 5-15, 5-20, 6-15, and 6-20 in ANSI/NEMA WD , Standard fr Dimensins f Attachment Plugs and Receptacles Wiring Devices Dimensinal Specificatins. Reasn fr the Change The previus requirements fr 15- and 20- ampere, 125- and 250-vlt receptacles installed in a wet lcatin still hlds true with language added t indicate that ther listed prducts, enclsures, r assemblies prviding weatherprf prtectin that d 2017 NEC Significant Cde Changes Part 2 5

8 nt utilize an utlet bx hd need nt be marked extra duty Tamper-Resistant Receptacles Tamper-Resistant Receptacles. Tamper-resistant receptacles shall be installed as All 15- and 20-ampere, 125- and 250-vlt nnlcking-type receptacles in the areas specified in (A) thrugh (C) (1) thrugh (7) shall be listed tamper-resistant receptacles. (1) Dwelling units in all areas specified in and (2) Guest rms and guest suites f htels and mtels (3) Child care facilities (4) Preschls and elementary educatin facilities (5) Business ffices, crridrs, waiting rms and the like in clinics, medical and dental ffices and utpatient facilities (6) Subset f assembly ccupancies described in Article t include places f waiting transprtatin, gymnasiums, skating rinks, and auditriums (7) Drmitries Infrmatinal Nte: This requirement wuld include receptacles identified as 5-15, 5-20, 6-15, and 6-20 in ANSI/NEMA WD , Wiring Devices Dimensinal Specificatins. Exceptin t (A), (B), and (C) (1), (2), (3), (4), (5), (6), and (7): Receptacles in the fllwing lcatins shall nt be required t be tamper-resistant: (1) Receptacles lcated mre than 1.7 m (51/2 ft) abve the flr (2) Receptacles that are part f a luminaire r appliance (3) A single receptacle r a duplex receptacle fr tw appliances lcated within the dedicated space fr each appliance that, in nrmal use, is nt easily mved frm ne place t anther and that is crd-and-plug-cnnected in accrdance with (A)(6), (A)(7), r (A)(8) (4) Nngrunding receptacles used fr replacements as permitted in 406.4(D)(2)(a) Reasn fr the Change Alng with the tamper-resistant receptacle requirements f the 2014 NEC, tamperresistant receptacle requirements were expanded t mbile and manufactured hmes, preschls and elementary educatin facilities, drmitries, business ffices, crridrs, waiting rms and the like in clinics, medical and dental ffices and utpatient facilities, assembly ccupancies including places f waiting, transprtatin, gymnasiums, skating rinks, and auditriums. The vltage rating at which tamper-resistant receptacle requirements are applicable was expanded t include bth 125 vlts and 250 vlts Dimmer-Cntrlled Receptacles Dimmer-Cntrlled Receptacles. A receptacle supplying lighting lads shall nt be cnnected t a dimmer unless the plug/receptacle cmbinatin is a nnstandard cnfiguratin type that is specifically listed and identified fr each such unique cmbinatin. Reasn fr the Change The requirements fr dimmer-cntrlled receptacles at have been deleted. This sectin sught t crrect incmpatibilities between certain types f dimmers and certain crd-and-plug cnnected lads. Such incmpatibilities are currently dealt with in the listing f specific lad types and the listing f specific dimmer types. ARTICLE 408 Switchbards, Switchgear, and Panelbards 408.3(A)(2) Supprt and Arrangement f Busbars and Cnductrs. (Switchbards, Switchgear, and Panelbards) 2017 NEC Significant Cde Changes Part 2 6

9 (2) Service Switchbards and Switchgear. Barriers shall be placed in all service panelbards, switchbards, and switchgear such that n uninsulated, ungrunded service busbar r service terminal is expsed t inadvertent cntact by persns r maintenance equipment while servicing lad terminatins. Exceptin: This requirement shall nt apply t service panelbards with prvisins fr mre than ne service discnnect within a single enclsure as permitted in , Exceptins N. 1, 2, and 3. Reasn fr the Change The barrier requirements f 408.3(A)(2) were expanded t all service panelbards as well as service switchbards and switchgear. An exceptin als was added eliminating the barriers at panelbards installed t cmply with the requirements f , Ex. N. 1, 2, and 3. ARTICLE 409 Industrial Cntrl Panels (B) Shrt-Circuit Current Rating. (Industrial Cntrl Panels) (A) Installatin. An industrial cntrl panel shall nt be installed where the available fault shrt-circuit current exceeds its shrt-circuit current rating as marked in accrdance with (4). (B) Dcumentatin. If an industrial cntrl panel is required t be marked with a shrtcircuit current rating in accrdance with (4), the available shrt-circuit current at the industrial cntrl panel, and the date the shrt-circuit current calculatin was perfrmed shall be dcumented and made available t thse authrized t inspect the installatin. Reasn fr the Change The missing cmpanin cmpnent fr dcumentatin f the available shrt-circuit current (fault current) at industrial cntrl panels was added at (B). This new requirement als required dcumentatin f the date the shrt-circuit current calculatin was perfrmed. ARTICLE 410 Luminaires, Lamphlders, and Lamps (C)(1) Crd-Cnnected Lamphlders and Luminaires (C) Electric-Discharge and LED Luminaires. Electric-discharge and LED luminaires shall cmply with (1), (2), and (3) as applicable. (1) Crd-Cnnected Installatin. A luminaire r a listed assembly in cmpliance with any f the cnditins in (a) thrugh (c) shall be permitted t be crd cnnected if the fllwing cnditins apply:prvided the luminaire is lcated directly belw the utlet r busway, the flexible crd meets all the fllwing: is nt subject t strain r physical damage, and the crd is visible ver its entire length utside the luminaire except at terminatins. (a) A luminaire shall be permitted t be cnnected with a crd terminating terminated in a grunding-type attachment plug r busway plug. (b) A luminaire assembly equipped with a strain relief and canpy shall be permitted t use a crd cnnectin between the luminaire assembly and the canpy. The canpy shall be permitted t include a sectin f raceway having a maximum nt ver 152 mm 150 mm (6 in.) in length and intended t facilitate the cnnectin t an utlet bx munted abve a suspended ceiling. (c) Listed luminaires cnnected using listed assemblies that incrprate manufactured wiring system cnnectrs in accrdance with 604.6(C) (C) shall be permitted t be crd cnnected. Reasn fr the Change The same basic requirements still apply t crd-cnnected electric-discharge and LED luminaires with the infrmatin re-rganized int an easier t understand list frmat that imprves the clarity f the cntent NEC Significant Cde Changes Part 2 7

10 ARTICLE 411 Lighting Systems Operating at 30 Vlts r Less and Lighting Equipment Cnnected t Class-2 Pwer Surces Article 411 Lw-Vltage Lighting Article 411 Lw- Vltage Lighting Systems Operating at 30 Vlts r Less and Lighting Equipment Cnnected t Class 2 Pwer Surces Scpe. This article cvers lighting systems and their assciated cmpnents perating at n mre than 30 vlts r less and their assciated cmpnents. This article als cvers lighting equipment cnnected t a Class 2 pwer surce ac r 60 vlts dc. Where wet cntact is likely t ccur, the limits are 15 vlts ac r 30 vlts dc. Infrmatinal Nte: Refer t Article 680 fr applicatins invlving immersin Lw-Vltage Lighting Systems Listing Required Specific Lcatin Requirements Secndary Circuits Hazardus (Classified) Lcatins. Reasn fr the Change The limitatins f 411.3(A) and (B) fr lwvltage lighting systems perating at 30 vlts r less and the limitatins f Class 2 lwvltage lighting systems cnfrming t NEC Chapter 9, Table 11(A) r Table 11(B) was remved fr the 2017 NEC. These lwvltage lighting systems addressed by Article 411 are nw basically limited by the maximum rating f 25 amperes fr the utput circuits f the pwer supply under all lad cnditins. ARTICLE 422 Appliances Definitin. (Appliances) Vending Machine. Any self-service device that dispenses prducts r merchandise withut the necessity f replenishing the device between each vending peratin and is designed t require insertin f cin, paper currency, tken, card, key, r receipt f payment by ther means. Reasn fr the Change Vending machines are still required t be GFCI-prtected, but the requirement has been relcated t 422.5(A)(5). All appliances perating at 50 vlts r mre are nw required be listed (see new 422.6). In determining what cnstitutes a vending machine, the user f the Cde will need t rely n the listing and the prduct standards fr vending machines Grund-Fault Circuit- Interrupter (GFCI) Prtectin fr Persnnel Grund-Fault Circuit- Interrupter (GFCI) Prtectin fr Persnnel. The device prviding GFCI prtectin required in this article shall be readily accessible. (A) General. Appliances identified in 422.5(A)(1) thrugh (5) rated 250 vlts r less and 60 amperes r less, single- r 3-phase, shall be prvided with GFCI prtectin fr persnnel. Multiple GFCI prtective devices shall be permitted but shall nt be required. (1) Autmtive vacuum machines prvided fr public use (2) Drinking funtains water clers (3) High-pressure spray washing machines crd- and plug-cnnected (4) Tire inflatin machines prvided fr public use (5) Vending machines 2017 NEC Significant Cde Changes Part 2 8

11 (B) Type. The GFCI shall be readily accessible, listed, and lcated in ne r mre f the fllwing lcatins: (1) Within the branch circuit vercurrent device (2) A device r utlet within the supply circuit (3) An integral part f the attachment plug (4) Within the supply crd nt mre than 300 mm (12 in.) frm the attachment plug (5) Factry installed within the appliance Reasn fr the Change The five appliances requiring GFCI prtectin in Article 422 were gruped tgether, and the GFCI requirements fr these appliances were relcated t ne lcatin at 422.5(A). A new 422.5(B) was als added allwing five ptins fr the lcatin and type f GFCI prtective device prvided t deliver GFCI prtectin t the specific appliances listed at 422.5(A) Listing Required. (Appliances) Listing Required. (Appliances) All appliances perating at 50 vlts r mre shall be listed. Reasn fr the Change A new sectin has been added t Article 422 requiring that all appliances perating at 50 vlts r mre must be listed Infrared Lamp Industrial Heating Appliances Infrared Lamp Industrial Heating Appliances. In industrial ccupancies, infrared heating appliance lamphlders shall be permitted t be perated in series n circuits f ver 150 vlts t grund, prvided the vltage rating f the lamphlders is nt less than the circuit vltage. Each sectin, panel, r strip carrying a number f infrared lamphlders (including the internal wiring f such sectin, panel, r strip) shall be cnsidered an appliance. The terminal cnnectin blck f each such assembly shall be cnsidered an individual utlet. Reasn fr the Change Sectin titled, Infrared Lamp Industrial Heating Appliances, was deleted and the infrmatin relcated t new Article 425 at (B)(2) Flexible Crds. (Appliances) (2) Built-in Dishwashers and Trash Cmpactrs. Built-in dishwashers and trash cmpactrs shall be permitted t be crd- and plug-cnnected with a flexible crd identified as suitable fr the purpse in the installatin instructins f the appliance manufacturer where all f the fllwing cnditins are met: (1) The flexible crd shall be terminated with a grunding-type attachment plug. Exceptin: A listed dishwasher r trash cmpactr distinctly marked t identify it as prtected by a system f duble insulatin, r its equivalent, shall nt be required t be terminated with a grunding-type attachment plug. (2) Fr a trash cmpactr, Tthe length f the crd shall be 0.9 m t 1.2 m (3 ft t 4 ft) measured frm the face f the attachment plug t the plane f the rear f the appliance. (3) Fr a built-in dishwasher, the length f the crd shall be 0.9 m t 2.0 m (3 ft t 6.5 ft) measured frm the face f the attachment plug t the plane f the rear f the appliance. (4) Receptacles shall be lcated t avid prtect against physical damage t the flexible crd. (5) The receptacle fr a trash cmpactr shall be lcated in the space ccupied by the appliance r adjacent theret. (6) The receptacle fr a built-in dishwasher shall be lcated in the space adjacent t the space ccupied by the dishwasher. (7) The receptacle shall be accessible. Reasn fr the Change Dishwashers are nw nly permitted t have the receptacle utlet fr a crd- and plugcnnected built-in dishwasher t be lcated in the space adjacent t the space ccupied 2017 NEC Significant Cde Changes Part 2 9

12 by the dishwasher. The maximum length f a crd fr a built-in dishwasher was extended frm the previus maximum length f 1.2 m (4 ft) t 2.0 m (6.5 ft) measured frm the face f the attachment plug t the plane f the rear f the appliance. Other requirements fr dishwashers and trash cmpactrs remain the same as in the 2014 NEC (B)(4) Flexible Crds. (Appliances) Range Hds (4) Range Hds. Range hds shall be permitted t be crd- and plug-cnnected with a flexible crd identified as suitable fr use n range hds in the installatin instructins f the appliance manufacturer, where all f the fllwing cnditins are met: (1) The flexible crd is terminated with a grunding-type attachment plug. Exceptin: A listed range hd distinctly marked t identify it as prtected by a system f duble insulatin, r its equivalent, shall nt be required t be terminated with a grundingtype attachment plug. (2) The length f the crd is nt less than 450 mm (18 in.) and nt ver 900 mm (36 in.) 1.2 m (4 ft). (3) Receptacles are lcated t avid prtect against physical damage t the flexible crd. (4) The receptacle is accessible. (5) The receptacle is supplied by an individual branch circuit. Reasn fr the Change The requirements fr a crd- and plugcnnected range hd are much the same as the 2014 NEC with the length f the flexible crd expanded t 1.2 m (4 ft). The language pertaining t the receptacle needing t be lcated t avid physical damage was changed t prtect against physical damage t incrprate mre enfrceable language. ARTICLE 424 Fixed Electric Space-Heating Equipment Article 424 Part V Fixed Electric Space-Heating Equipment The fllwing article title texts have been updated: Ceiling Installatin f Heating Cables n Dry Bard, in Plaster, and n Cncrete Ceilings Inspectin and Tests. Installatin f Cables Under Flr Cvering Inspectin and Test Label Prvided by Manufacturer. Reasn fr the Change Part V f Article 424 was revised fr simpler interpretatin and applicatin. Tw new sectins were added. These sectins ( and ) address prper installatins f cables under flr cverings and labels prvided by the manufacturer. The previus editin f the Cde did nt prperly address these added items in Part V Installatin f Cables Under Flr Cverings Installatin f Cables Under Flr Cverings. (A) Identificatin. Heating cables fr installatin under flr cvering shall be identified as suitable fr installatin under flr cvering. (B) Expansin Jints. Heating cables shall nt be installed where they bridge expansin jints unless prvided with expansin and cntractin fittings applicable t the manufacture f the cable. (C) Cnnectin t Cnductrs. Heating cables shall be cnnected t branch-circuit and supply wiring by wiring methds described in the installatin instructins r as recgnized in Chapter NEC Significant Cde Changes Part 2 10

13 (D) Anchring. Heating cables shall be psitined r secured in place under the flr cvering, per the manufacturer s instructins. (E) Grund-Fault Circuit-Interrupter Prtectin. Grund-fault circuit-interrupter prtectin fr persnnel shall be prvided. (F) Grunding Braid r Sheath. Grunding means, such as cpper braid, metal sheath, r ther apprved means, shall be prvided as part f the heated length. Reasn fr the Change New requirements were added at (Part V f Article 424) t give directin fr the installatin f heating cables installed under flr cverings Label Prvided by Manufacturer Label Prvided by Manufacturer. The manufacturers f electric space-heating cables shall prvide marking labels that indicate that the space-heating installatin incrprates electric space-heating cables, and instructins that the labels shall be affixed t the panelbards t identify which branch circuits supply the circuits t thse space-heating installatins. If the electric space-heating cable installatins are visible and distinguishable after installatin, the labels shall nt be required t be prvided and affixed t the panelbards. Reasn fr the Change New requirements fr manufacturer s labels were added at in Part V f Article 424 fr applicatin t electric space-heating cables. The manufacturer s label requirements fr heating panels and panel sets at (D) remained the same. Article 424 Part X Fixed Electric Space-Heating Equipment Part X. Lw-Vltage Fixed Electric Space-Heating Equipment Scpe. Lw-vltage fixed electric space-heating equipment shall cnsist f an islating pwer supply, lw-vltage heaters, and assciated equipment that are all identified fr use in dry lcatins Energy Surce. (A) Pwer Unit. The pwer unit shall be an islating type with a rated utput nt exceeding 25 amperes, 30 vlts (42.4 vlts peak) ac, r 60 vlts dc under all lad cnditins. (B) Alternate Energy Surces. Listed lw-vltage fixed electric space-heating equipment shall be permitted t be supplied directly frm an alternate energy surce such as slar phtvltaic (PV) r wind pwer. When supplied frm such a surce, the surce and any pwer cnversin equipment between the surce and the heating equipment and its supply shall be listed and cmply with the applicable sectin f the NEC fr the surce used. The utput f the surce shall meet the limits f (A) Listed Equipment. Lw-vltage fixed electric space-heating equipment shall be listed as a cmplete system Installatin. (A) General. Equipment shall be installed per the manufacturer s installatin instructins. (B) Grund. Secndary circuits shall nt be grunded. (C) Grund-Fault Prtectin. Grundfault prtectin shall nt be required Branch Circuit. (A) Equipment shall be permitted t be supplied frm branch circuits rated nt ver 30 amperes. (B) The equipment shall be cnsidered a cntinuus duty lad. Reasn fr the Change T address prducts identified as lwvltage fixed electric space-heating equipment, a new Part X was added t Article 424 fr the 2017 NEC NEC Significant Cde Changes Part 2 11

14 ARTICLE 425 Fixed Resistance and Electrde Industrial Prcess Heating Equipment Nte: Article 425 is ne f the majr additins t the 2017 NEC. The entire article is as fllws. Part I. General Scpe. This article cvers fixed industrial prcess heating emplying electric resistance r electrde heating technlgy. Fr the purpse f this article, heating equipment shall include bilers, electrde bilers, duct heaters, strip heaters, immersin heaters, prcess air heaters, r ther apprved fixed electric equipment used fr industrial prcess heating. This article shall nt apply t heating and rm air cnditining fr persnnel spaces cvered by Article 424, fixed heating equipment fr pipelines and vessels cvered by Article 427, and inductin and dielectric heating equipment cvered by Article 665, and industrial furnaces incrprating silicn carbide, mlybdenum, r graphite prcess heating elements Other Articles. Fixed industrial prcess heating equipment incrprating a hermetic refrigerant mtr-cmpressr shall als cmply with Article Branch Circuits. (A) Branch-Circuit Requirements. Individual branch circuits shall be permitted t supply any vlt-ampere r wattage rating f fixed industrial prcess heating equipment fr which they are rated. (B) Branch-Circuit Sizing. Fixed industrial prcess heating equipment and mtrs shall be cnsidered cntinuus lads Listed Equipment. Fixed industrial prcess heating equipment shall be listed. Part II. Installatin General. (A) Lcatin. Fixed industrial prcess heating equipment shall be lcated with respect t building cnstructin and ther equipment s as t permit access t the equipment. Sufficient clearance shall be maintained t permit replacement f cntrls and heating elements and fr adjusting and cleaning f cntrls and ther parts requiring such attentin. (B) Wrking Space. Wrking space abut electrical enclsures fr fixed industrial prcess heating equipment that require examinatin, adjustment, servicing, r maintenance while energized shall be accessible, and the wrk space fr persnnel shall cmply with and , based upn the utilizatin vltage t grund. Exceptin: With special permissin, in industrial establishments nly, where cnditins f maintenance and supervisin ensure that nly qualified persns will service the installatin, wrking space less than that required in r shall be permitted. (C) Abve Grade Level, Flr, r Wrk Platfrm. Where the enclsure is lcated abve grade, the flr, r a wrk platfrm, all f the fllwing shall apply: (1) The enclsure shall be accessible. (2) The width f the wrking space shall be the width f the enclsure r a minimum f 762 mm (30 in.), whichever is greater. (3) The depth f the wrkspace shall cmply with (A) r based upn the vltage t grund. (4) All drs r hinged panels shall pen t at least 90 degrees Apprval. All fixed industrial prcess heating equipment and systems installed by methds ther than cvered by this article shall be permitted nly be special permissin Special Permissin. Fixed industrial prcess heating equipment and systems installed by methds ther than cvered by this article shall be permitted nly by special permissin NEC Significant Cde Changes Part 2 12

15 Supply Cnductrs. Fixed industrial prcess heating equipment requiring supply cnductrs with ver 60 C insulatin shall be clearly and permanently marked. This marking shall be plainly visible after installatin and shall be permitted t be adjacent t the field cnnectin bx Lcatins. (A) Expsed t Physical Damage. Where subject t physical damage, fixed industrial prcess heating equipment shall be prtected in an apprved manner. (B) Damp r Wet Lcatins. Fixed industrial prcess heating equipment installed in damp r wet lcatins shall be listed fr such lcatins and shall be cnstructed and installed s that water r ther liquids cannt enter r accumulate in r n wired sectins, electrical cmpnents, r ductwrk. Infrmatinal Nte: See fr equipment expsed t deterirating agents Spacing frm Cmbustible Materials. Fixed industrial prcess heating equipment shall be installed t prvide the required spacing between the equipment and adjacent cmbustible material, unless it is listed t be installed in direct cntact with cmbustible material Infrared Lamp Industrial Heating Equipment. In industrial ccupancies, infrared industrial prcess heating equipment lamphlders shall be permitted t be perated in series n circuits f ver 150 vlts t grund, prvided the vltage rating f the lamphlders is nt less than the circuit vltage. Each sectin, panel, r strip carrying a number f infrared lamphlders, including the terminal wiring f such sectin, panel, r strip, shall be cnsidered as infrared industrial heating equipment. The terminal cnnectin blck f each assembly shall be cnsidered an individual utlet. Part III. Cntrl and Prtectin f Fixed Industrial Prcess Heating Equipment Discnnecting Means. Means shall be prvided t simultaneusly discnnect the heater, mtr cntrller(s), and supplementary vercurrent prtective device(s) f all fixed industrial prcess heating equipment frm all ungrunded cnductrs. Where heating equipment is supplied by mre than ne surce, feeder, r branch circuit, the discnnecting means shall be gruped and identified as having multiple discnnecting means. Each discnnecting means shall simultaneusly discnnect all ungrunded cnductrs that it cntrls. The discnnecting means specified in (A) and (B) shall have an ampere rating nt less than 125 percent f the ttal lad f the mtrs and the heaters and shall be lckable in accrdance with (A) Heating Equipment with Supplementary Overcurrent Prtectin. The discnnecting means fr fixed industrial prcess heating equipment with supplementary vercurrent prtectin shall be within sight frm the supplementary vercurrent prtective device(s), n the supply side f these devices, if fuses, and, in additin, shall cmply with either (A)(1) r (A)(2). (1) Heater Cntaining N Mtr Rated ver 1/8 Hrsepwer. The discnnecting means specified in r unit switches cmplying with (C) shall be permitted t serve as the required discnnecting means fr bth the mtr cntrller(s) and heater under either f the fllwing cnditins: (1) The discnnecting means prvided is als within sight frm the mtrcntrller(s) and the heater. (2) The discnnecting means is lckable in accrdance with (2) Heater Cntaining a Mtr(s) Rated ver 1 8 Hrsepwer. The abve discnnecting means shall be permitted t serve as the required discnnecting means fr bth the mtr cntrller(s) and heater under either f the fllwing cnditins: (1) The discnnecting means is in sight frm the mtr cntrller(s) and the heater and cmplies with Part IX f Article NEC Significant Cde Changes Part 2 13

16 (2) Mtr(s) f mre than 1 8 hp and the heater are prvided with a single unit switch that cmplies with (A), (B), (C), r (D), the discnnecting means shall be permitted t be ut f sight frm the mtr cntrller. (B) Heating Equipment Withut Supplementary Overcurrent Prtectin. (1) Withut Mtr r with Mtr Nt ver 1 8 Hrsepwer. Fr fixed industrial prcess heating equipment withut a mtr rated ver 1 8 hp, the branch-circuit switch r circuit breaker shall be permitted t serve as the discnnecting means where the switch r circuit breaker is within sight frm the heater r is lckable in accrdance with (2) Over 1 8 Hrsepwer. Fr mtrdriven fixed industrial prcess heating equipment with a mtr rated ver 1 8 hp, a discnnecting means shall be lcated within sight frm the mtr cntrller r shall be permitted t cmply with the requirements in (A)(2). (C) Unit Switch(es) as Discnnecting Means. A unit switch(es) with a marked ff psitin that is part f a fixed heater and discnnects all ungrunded cnductrs shall be permitted as the discnnecting means required by this article. The branch circuit switch r circuit breaker, where readily accessible fr servicing f the fixed heater, shall be permitted as the ther discnnecting means Switch and Circuit Breaker t Be Indicating. Switches and circuit breakers used as discnnecting means shall be f the indicating type (A) Branch-Circuit Devices. Fixed industrial prcess heating equipment ther than such mtr perated equipment as required by Articles 430 and 440 t have additinal vercurrent prtectin shall be permitted t be prtected against vercurrent where supplied by ne f the branch circuits in Article 210. (B) Resistance Elements. Resistance-type heating elements in fixed industrial prcess heating equipment shall be prtected at nt mre than 60 amperes. Equipment rated mre than 48 amperes and emplying such elements shall have the heating elements subdivided, and each subdivided lad shall nt exceed 48 amperes. Where a subdivided lad is less than 48 amperes, the rating f the supplementary vercurrent prtective device shall cmply with 425.3(B). A biler emplying resistance-type immersin heating elements cntained in an ASME-rated and stamped vessel shall be permitted t cmply with (A). (C) Overcurrent Prtective Devices. The supplementary vercurrent prtective devices fr the subdivided lads specified in (B) shall be (1) factry installed within r n the heater enclsure r supplied fr use with the heater as a separate assembly by the heater manufacturer; (2) accessible, but shall nt be required t be readily accessible; and (3) suitable fr branch-circuit prtectin. Infrmatinal Nte N. 1: See Where cartridge fuses are used t prvide this vercurrent prtectin, a single discnnecting means shall be permitted t be used fr the several subdivided lads. Infrmatinal Nte N. 2: Fr supplementary vercurrent prtectin, see Infrmatinal Nte N. 3: discnnecting means fr cartridge fuses in circuits f any vltage, see (D) Branch-Circuit Cnductrs. The cnductrs supplying the supplementary vercurrent prtective devices shall be cnsidered branch-circuit cnductrs. Where the heaters are rated 50 kw r mre, the cnductrs supplying the supplementary vercurrent prtective devices specified in (C) shall be permitted t be sized at nt less than 100 percent f the nameplate rating f the heater, prvided all f the fllwing cnditins are met: (1) The heater is marked with a minimum cnductr size NEC Significant Cde Changes Part 2 14

17 (2) The cnductrs are nt smaller than the marked minimum size. (3) A temperature-actuated device cntrls the cyclic peratin f the equipment. (E) Cnductrs fr Subdivided Lads. Field-wired cnductrs between the heater and the supplementary vercurrent prtective devices fr fixed industrial prcess heating equipment shall be sized at nt less than 125 percent f the lad served. The supplementary vercurrent prtective devices specified in (C) shall prtect these cnductrs in accrdance with Where the heaters are rated 50 kw r mre, the ampacity f fieldwired cnductrs between the heater and the supplementary vercurrent prtective devices shall be permitted t be nt less than 100 percent f the lad f their respective subdivided circuits, prvided all f the fllwing cnditins are met: (1) The heater is marked with a minimum cnductr size. (2) The cnductrs are nt smaller than the marked minimum size. (3) A temperature-activated device cntrls the cyclic peratin f the equipment. Part IV. Marking f Heating Equipment Nameplate. (A) Marking Required. Fixed industrial prcess heating equipment shall be prvided with a nameplate giving the identifying name and the nrmal rating in vlts and watts r in vlts and amperes. Fixed industrial prcess heating equipment intended fr use n alternating current nly, direct current nly, r bth shall be marked t s indicate. The marking f equipment cnsisting f mtrs ver 1 8 hp and ther lads shall specify the rating f the mtr in vlts, amperes, and frequency and the heating lad in vlts and watts r in vlts and amperes. (B) Lcatin. This nameplate shall be lcated s as t be visible r easily accessible after installatin Marking f Heating Elements. All heating elements that are replaceable in the field and are part f industrial prcess heating equipment shall be legibly marked with the ratings in vlts r watts r in vlts r amperes Cncealed Fixed Industrial Heating Equipment Inspectin and Tests. Cncealed fixed industrial heating equipment installatins shall be made with due care t prevent damage t the heating equipment and shall be inspected and apprved befre heating equipment is cvered r cncealed. Part V. Fixed Industrial Prcess Duct Heaters General. Part V shall apply t any heater munted in the airstream f a frced-air system where the air-mving unit is nt prvided as an integral part f the equipment Identificatin. Heaters installed in an air duct shall be identified as suitable fr the installatin Airflw. Means shall be prvided t ensure unifrm airflw ver the face f the heater in accrdance with the manufacturer s instructins. Infrmatinal Nte: Sme heaters installed within 1.2 m (4 ft) f the utlet f an air-mving device, elbws, baffle plates, r ther bstructins in ductwrk use turning vanes, pressure plates, r ther devices n the inlet side f the duct heater t ensure an even distributin f air ver the face f the heater Elevated Inlet Temperature. Duct heaters intended fr use with elevated inlet air temperature shall be identified as suitable fr use at the elevated temperatures Fan Circuit Interlck. Means shall be prvided t ensure that the fan circuit, where present, is energized when any heater circuit is energized. Hwever, time- r temperature cntrlled delay in energizing the fan mtr shall be permitted NEC Significant Cde Changes Part 2 15

18 Limit Cntrls. Each duct heater shall be prvided with an apprved, integral, autmatic-reset temperature limiting cntrl r cntrllers t de-energize the circuit r circuits. In additin, an integral independent supplementary cntrl r cntrllers shall be prvided in each duct heater that discnnects a sufficient number f cnductrs t interrupt current flw. This device shall be manually resettable r replaceable Lcatin f Discnnecting Means. Duct heater cntrller equipment shall be either accessible with the discnnecting means installed at r within sight frm the cntrller r as permitted by (A). Part VI. Fixed Industrial Prcess Resistance-Type Bilers Scpe. The prvisins in Part VI f this article shall apply t bilers emplying resistance-type heating elements. Electrdetype bilers shall nt be cnsidered as emplying resistance-type heating elements. See Part VII f this article Identificatin. Resistance-type bilers shall be identified as suitable fr the installatin Overcurrent Prtectin. (A) Biler Emplying Resistance-Type Immersin Heating Elements in an ASME-Rated and Stamped Vessel. A biler emplying resistance-type immersin heating elements cntained in an ASME-rated and stamped vessel shall have the heating elements prtected at nt mre than 150 amperes. Such a biler rated mre than 120 amperes shall have the heating elements subdivided int lads nt exceeding 120 amperes. Where a subdivided lad is less than 120 amperes, the rating f the vercurrent prtective device shall cmply with 425.3(B). (B) Biler Emplying Resistance-Type Heating Elements Rated Mre Than 48 Amperes and Nt Cntained in an ASME-Rated and Stamped Vessel. A biler emplying resistance-type heating elements nt cntained in an ASME-rated and stamped vessel shall have the heating elements prtected at nt mre than 60 amperes. Such a biler rated mre than 48 amperes shall have the heating elements subdivided int lads nt exceeding 48 amperes. Where a subdivided lad is less than 48 amperes, the rating f the vercurrent prtective device shall cmply with 425.3(B). (C) Supplementary Overcurrent Prtective Devices. The supplementary vercurrent prtective devices fr the subdivided lads as required by (A) and (B) shall be as fllws: (1) Factry-installed within r n the biler enclsure r prvided as a separate assembly by the biler manufacturer. (2) Accessible, but need nt be readily accessible. (D) Suitable fr Branch-Circuit Prtectin. Where cartridge fuses are used t prvide this vercurrent prtectin, a single discnnecting means shall be permitted fr the several subdivided circuits. See (E) Cnductrs Supplying Supplementary Overcurrent Prtective Devices. The cnductrs supplying these supplementary vercurrent prtective devices shall be cnsidered branch circuit cnductrs. Where the heaters are rated 50 kw r mre, the cnductrs supplying the vercurrent prtective device specified in (C) shall be permitted t be sized at nt less than 100 percent f the nameplate rating f the heater, prvided all f the fllwing cnditins are met: (1) The heater is marked with a minimum cnductr size. (2) The cnductrs are nt smaller than the marked minimum size. (3) A temperature- r pressure-actuated device cntrls the cyclic peratin f the equipment. (F) Cnductrs fr Subdivided Lads. Field-wired cnductrs between the heater and 2017 NEC Significant Cde Changes Part 2 16