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Electrical Code Revisions

Code Revision and Interpretation Committee Code Interpretation For 2003

In an effort to help the electrical industry make a smooth transition into the new Electrical Code and ensure the continuity in the performance of electrical work, the Department of Buildings will be posting code interpretations on its website. Listed below are new code-related questions and corresponding interpretations by the Code Committee. The users of this list should have available the 1999 edition of the NEC and the associated NYC Amendments to the 1999 NEC (PDF) (Local Law 41/02), as well as Local Law 64/01 (PDF) (that went into effect on January 1, 2003.

To learn more about what each chapter / topic is about, click on the chapter number.
To find questions on the related topic, click on the topic or section code.

Chapter 1: General (Section 110-2/110-59)
Chapter 2: Wiring and Protection (Section 200-1/280-25)
Chapter 3: Wiring Methods & Materials (Section 300-1/384-37)
Chapter 4: Equipment for General Use (Section 400-1/490-74)
Chapter 5: Special Occupancies (Section 500-1/555-11)
Chapter 6: Special Equipment (Section 600-1/695-14)
Chapter 7: Special Conditions (Section 700-1/780-7)
Chapter 8: Communications Systems (Section 800-1/830-58)
Table: Requirements for conductors and conduits
Administrative: General Requirements (Local Laws 64/2001 and 81/2003)

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CHAPTER 1: GENERAL (Code Section 110-2 to 110-59)

SECTION 110

Q: How does the NY City Electrical Code define service and the associated service entrance disconnect(s)? Is it the point of connection to the utility (Con Ed)?(5/7/2003)

A: See Article 100 of the 1999 NEC for the appropriate definitions.

SECTION 110

Q: Are transformers, UPS systems, generators, generator paralleling equipment or other sources, outlined in the amended Article 110-2(b) of the 1999 NEC, considered to be services? If so, are they required to meet the density rating of the amended Article 230-42(a)? (5/7/2003)

A: These are components of separately derived systems. See Article 100 of the 1999 NEC.

SECTION 110-2 

Q: Is it permissible to use a NEMA 4X stainless steel box as a splice/pull box for a 4.16 KV feeder? (9/3/2003)

A: Yes, per Article 110-2. Stainless steel is not an issue.

SECTION 110-2 

Q: Is it permissible to use a NEMA 4X stainless steel box as a splice/pull box for a 4.16 KV feeder? (9/3/2003)

A: Yes, per Article 110-2. Stainless steel is not an issue.

SECTION 110-2 

Q: Does the NY City Electrical Code allow the use of enclosed Module Zone Distribution Wiring System for office furniture? (12/10/2003)

A: This product line is addressed in Articles 604 and 605 of the NEC as amended by NY City. All installations require Advisory Board approval. See Article 110-2.

SECTION 110-2 

Q: Are "under cabinet portable task lights", that are cord connected,acceptable for use in New York City? (11/10/2003)

A: Advisory Board approval is required. See Article 110-02.

SECTION 110-2 

Q: The elevators of a building run on DC power. The DC system will soon be converted to an AC system. The building service is over 1000 KVA. Could this installation be performed without the Advisory Board approval? (7/9/2003)

A: No. This installation requires Advisory Board filing. See amended Article 110-2.

SECTION 110-2(a) and 760

Q: Can THHN conductors in EMT be used for the normal and emergency power circuits of a Fire Alarm System? (9/3/2003)

A: Yes, provided that the materials used for all the job and environmental conditions, and that conductors of normal and emergency circuits are in separate conduit systems. See Articles 110-2(a) and 760 of the 1999 NEC including RS17-3 amended 4/13/03.

SECTION 110-3

Q: Are current density values in the 2001 NY City Electrical Code and previous codes applicable to the horizontal and vertical bus bars of motor control centers? If the current density values are applicable, what are the values? (3/12/2003)

A: No. Current density values of the MCC are specified in product listing. See Article 110-3 of the 1999 NEC. Current density values are not applicable.

SECTION 110-3 and 240-4

Q: Is it permissible to use relocatable power taps in NY City, when they are not used as a substitute for the fixed wiring of a structure?  (4/9/2003)

A: Relocatable power taps shall be approved for use as an extension to the branch circuit, use 12 AWG size wire and be approved by BEC. Use 14 AWG size wire where overcurrent protection is an integral component of the relocatable power tap. See Articles 110-3 and 240-4.

SECTION 110-3(b)

Q: Can a push-in plastic connector be used with Romex?  (9/3/2003)

A: Yes. See Article 110-3(b).

SECTION 110-14

Q: Is it permissible to use 90*C rated conductors, operating at 90*C ampacity, to connect a remote service end box with a CT cabinet installed in a switchboard? The termination lugs have a 90*C rating.  (4/9/2003)

A: Yes, if the entire system, including the switchboard, is suitable for use at 90*C. See Article 110-14.

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CHAPTER 2: WIRING AND PROTECTION (Code Section 200-1 to 280-25)

SECTION 210-6(d)

Q: Does the NY City Electrical Code allow the use of fluorescent lighting operating at 480V? (10/8/2003)

A: Yes, per Article 210-6(d).

SECTION 210-8

Q: What are the requirements for the installation of GFCI protected outlets in commercial buildings? (1/8/2003)

A: GFCI protected receptacles outlets, shall be installed in accordance with Article 210-8.

SECTION 210-8

Q: In an outdoor laundry space of a residential building, an electrical outlet is located next to the water pipe. Is there a space requirement between the electrical outlet and the water pipe? Should the outlet be weatherproof and have GFCI protection? (6/4/2003)

A: There is no space requirement between an electrical outlet and a water pipe. Receptacle outlets installed on the outside of a residential building are required to be weatherproof and be GFCI protected. See Article 210-8 of the 1999 NEC.

SECTION 210-8

Q: Does Article 210-8 require GFCI protected receptacles for an uninhabitable attic space? (9/3/2003)

A: No.

SECTION 210-8

Q: Article 210-8 requires GFCI personnel protection for 120V, 15A and 20A circuits in dwelling units, but does not identify the requirements for circuits higher than 30A, operating at 208V or non-dwelling occupancies. In a retail occupancy, does a 208V single phase 40A receptacle outlet serving an appliance, such as a coffee maker mounted 18 in above a sink, require GFCI protection?

a. If GFCI is required, how far away from the sink can the outlet be placed to avoid the need for GFCI?

b. How would ground fault be achieved for a 40A, 208V receptacle / circuit breaker? (10/8/2003)

A: a. & b. No. See Article 210-8 c. Not required.

SECTION 210-11(c)(2)

Q: The clothes dryer is connected to the same circuit as the other appliances. Does the dryer require a dedicated circuit? (6/4/2003)

A: The laundry receptacles require a dedicated circuit. See Article 210-11(c)(2) of the 1999 NEC.

SECTION 210-12

Q: The NY State Residential Construction Code has removed the requirement for Arc Fault Circuit Breakers (AFCB). Does the current NY City Electrical Code still require the AFCBs? (11/10/2003)

A: Yes. See Article 210-12.

SECTION 210-12(b)

Q: Two general purpose receptacles will be added in the bedroom of an existing dwelling unit. What are the code requirements, for the existing and the new receptacles, regarding AFCIs? (11/10/2003)

A: AFCIs are required for all new receptacles, as per Article 210-12(b).

SECTION 210-21(b)(3)

Q: How many 20 Amp receptacles are permitted on a 15 Amp circuit? (4/9/2003)

A: None, per table 210-21(b)(3).

SECTION 210-52(j)

Q: What is the definition for boiler controls on new applications? (9/3/2003)

A: See amended Article 210-52(j)

SECTION 210-70(a)(2)

Q: Does Article 210-70(a)(2) require a set of 3-way switches in the stairway of an unfinished basement with a single entrance and no exits? (9/3/2003)

A: No.

SECTION 220

Q: Is the method of calculating the demand load as described in Article 220 of the 1999 NEC? (10/8/2003)

A: Yes.

SECTION **220-3 and 220-13

Q: How many 15 Amp or 20 Amp receptacles are permitted on a 20 Amp circuit? Are two 20 Amp receptacles on a common yoke counted as one receptacle for this purpose? (4/9/2003)

A: For residential buildings there is no limit; for other than residential buildings, load assignments shall be based on Article 220-3 and 220-13 of the NEC. Two 20 Amp receptacles on a common yoke count as one receptacle.

SECTION **220-22 and 310-15(b)

Q: If the neural conductors are being considered as current carrying in a balanced 3 phase, 4 wire, 120/208V feeder, why (4) 500 KCMIL, rated for 400A, are not derated by 80% capacity? (3/12/2003)

A: If the neutral carries current, it must be derated, as per Articles 220-22 and 310-15(b) of the 1999 NEC.

SECTION 225-30, 225-31 and 225-32

Q: Is there a code violation for the following installation: Two buildings, one located in the front and the second in the rear of a property, have separate street addresses. The meter for the rear building is mounted on the outside of the front building, with the service conductors running underground. Each building has its own separate service. Can the service switch for the rear building be located in the rear or should it be grouped with the one for the front building? (12/10/2003)

A: A disconnect shall be installed in the rear building. Additionally, service disconnects for both buildings may be grouped at the front building. See Articles 225-30, 225-31 and 225-32.

SECTION 225-39

Q: Is the minimum feeder size requirement for a subpanel specified in Article 225-39? (9/3/2003)

A: Article 225-39 does not apply.

SECTION 230

Q: An electrical service has two 800Amp fused service switches fed from a standard Con-Ed service end box. Do the copper details in the service end box need to be changed to 2 laminations, due to the increase in electrical loads from 1600Amp to 2000Amp? Is a new service end box needed for the new load that will require 4 sets of feeders, in lieu of the existing 2 sets of 500 KCMIL? (3/12/2003)

A: The copper bus must be capable of carrying the load served and must be able to accommodate the connections, in accordance with Article 230 of the 1999 NEC.

SECTION 230-3 and 225-31

Q: Two adjoining buildings have separate points of entry and separate sets of meter banks.

   a. Can one point of entry be eliminated and feed both buildings from a single one?

   b. Can the two sets of meter banks be fed from one service switch?

   c. Are separate service switches required to be located in one building?  (4/9/2003)

A: a. Yes, if under the same ownership. Article 230-3.

    b. Yes.

    c. No. However, separate disconnecting means are required in each building. Article 225-31.

SECTION 230-42(a)

Q: Is the density rating chart in the amended Article 230-42(a) to be applied to all buswork within a switchboard, up to the main service disconnect(s)? (5/7/2003)

A: Yes.

SECTION 230-42(a)

Q: When a CT compartment is located ahead of the main disconnect, but not part of the same switchboard, (i.e.: within the 10 ft separation allowed), is the CT compartment required to have a density rated bus in accordance with the rating chart in the amended Article 230-42(a)? (5/7/2003)

A: Yes.

SECTION 230-42(a)

Q: Is a (4)1/4" x 6" service bus acceptable, when the total amperage of the service switches is 6000 Amp? (10/8/2003)

A: Yes. See amended Table 230-42(a).

SECTION 230-43

Q: Does Article 230-43 allow the use of PVC conduit supplied by Con Edison? (9/3/2003)

A: No. See amended Article 230-43.

SECTION 230-43

Q: Regarding the use of EMT, request interpretation of Article 230-43, line 4. (10/8/2003)

A: Article 230-43, allows the use of EMT for interior work only.

SECTION 230-70

Q: What is the maximum length of trough allowed between the P.O.E. box and the service switch? (5/7/2003)

A: The service switch must be located as close as possible to the P.O.E. Such installations are subject to case by case approval. Article 230-70 of the 1999 NEC.

SECTION 230-70(a)

Q: What constitutes the service disconnecting means for the point of service entrance? (5/7/2003)

A: The service disconnecting means is the first disconnect past the point of interface with the utility. See Article 230-70(a) of the 1999 NEC.

SECTION 230-79(c)

Q: In a one-family dwelling, does the power panel still need to be rated 125 Amp for a 100 Amp service?  (9/3/2003)

A: No. See Article 230-79(c).

SECTION 230-92

Q: Per Article 230-92, is a power panel in a tenant apartment of a two family dwelling required to have a main breaker of lower ampacity (derated)? (9/3/2003)

A: Yes.

SECTION 240-3(f) and 250-21

Q: In a large and tall building, due to the voltage drop, a step-up transformer Delta/Delta 208V to 480V is being used for the upper floors of the building, where a second step-down transformer Delta/Wye 480V to 120/208V is used to derive the working voltage.

    a. Does the new Electrical Code require a disconnect switch after the Delta/Delta step-up transformer?

    b. Does the secondary of the step-up transformer need to be grounded?(12/10/2003)

A: a. No. See Article 240-3(f).

    b. Yes. See Article 250-21.

SECTION **240-4(b) and (c)

Q: Are 500 KCMIL conductors acceptable for 400 Amp services or feeders? (1/8/2003)

A: Yes, up to 800 Amp. Above 800 Amp, full size feeder conductors must be used.

SECTION 240-21

Q: Is a local disconnect switch required for a 200 Amp electrical feeder that runs from the main service board, located in the basement, to the 1st floor ( approx 180 ft ) of a commercial building? (1/8/2003)

A: No, provided the overcurrent protective device at the service end properly protects the feeder and the panel served.

SECTION 240-21

Q: Should Article 240-21 of the 1999 NEC be used for sizing the tap conductors of a fire alarm system? (5/7/2003)

A: Article 240-21 of the 1999 NEC applies to feeder taps, not to service conductors.

SECTION 240-40

Q: An existing fire alarm system is supplied via a 3 phase 208 Volt, 200 Amp fused cut-out switch. The building service is being upgraded and the fire alarm system will now be fed from a 480/120-208 Volt transformer via the existing 200 Amp cut-outswitch. Is this permissible? (2/5/2003)

A: For 480 Volt installations, fire alarm systems shall be supplied with a fused service switch on the transformer primary and a listed fuse cut-out on the transformer secondary.

SECTION 250

Q: When a new service switch is added to an existing building service, who's grounding does not comply with Article 250 of the 1999 NEC, is it necessary to re-do the entire building grounding system to comply with the NEC? (5/7/2003)

A: New equipment must conform with the code in effect at the time of filing.

SECTION 250, 110-2 and 110-3

Q: Regarding 42 circuit 200 Amp power panel, where the main breaker is used as a service switch:

a. Do the primary ground (water main) and the secondary ground (driven rod) have to be attached to the same side of the split neutral bar as the service entrance neutral?

b. If the grounding conductors are too large for the neutral bar terminals, is it permissible to install a lug under the existing bolt joining the split neutral bar?

c. If the breaker capacity of the panel is full and it becomes necessary to install a sub-panel, is it permissible to tap the bus by installing a lug and using all of the existing hardware, while meeting all code requirements(distance and load)? (11/10/2003)

A: a. No. See Article 250.

b. No. See Article 110-2.

c. No, unless all provisions of Article 110-3 are met.

SECTION 250-28

Q: Service conductors (overhead or underground) are feeding 4-gang meters on the outside of a building, and individual conduits feed 4 service switches grouped inside the building. Is it permissible to bring grounding electrode conductors from the water main and from the grounding rod to the neutral bar of the largest or the closest service switch, to the point of entry, and only to bond the neutrals of the remaining 3 service switches with the manufacturer supplied ground strap or green grounding screw, without bringing grounding electrode conductor to the remaining service switches? (5/7/2003)

A: Yes, as long as all conduits and metallic enclosures are properly bonded. See Articles 250-28 and 250--30 of the 1999 NEC.

SECTION 250-50, 250-64(d), Table 250-66 and amended 347-2(1)

Q: For a new 200A service switch that is added to an existing 2000A service:

a. Is it required to make a cold compression connection between the new #4 grounding conductor and the existing 3/0 grounding conductors?

b. Is it permissible to use rigid non-metallic conduit when installing the grounding conductor to the new service switch?

c. Is a supplemental electrode required to be installed or can the existing building steel be used?

d. If a supplemental electrode is required, and considering that the building steel is within 40 inches of the ground clamp on the water main, what size bonding jumper should be used to connect to the building steel? (6/4/2003)

A: a. No, see Article 250-64(d).

b. No, see amended Article 347-2(1).

c. Either one is acceptable. Article 250-50.

d. The bonding jumper must be sized in accordance with Table 250-66.

SECTION 250-50

Q: In a building where the water main is 120 ft. from the main service disconnect, is it permissible to utilize the building steel as a grounding electrode conductor by installing jumpers from the building steel to the service switches and watermain? (12/10/2003)

A: No. See Article 250-50.

SECTION 250-50(a)(2) and 250-64

Q: a. What is the minimum and/or maximum size of a supplementary grounding electrode conductor to a grounding rod or building steel?

b. If the required size of the supplementary grounding electrode conductor is #6 AWG, what is the required size for a 100 Amp service switch? (12/10/2003)

A: a. The supplementary grounding electrode conductor is not required to be larger than #6 AWG. See Article 250-50(a)(2).

b. #8 AWG. For conductors smaller than #6 AWG, mechanical protection in the form of a raceway or cable armor is required. See amended Article 250-64(b).

SECTION 250-50(b)

Q: Is it permissible to use a sprinkler system pipe as the service ground in a steel building with no domestic water service?  (12/10/2003)

A: Yes, provided that ten feet of underground metallic piping is in place. Supplemental grounding electrode is also required. See Article 250-50(b).

SECTION 250-54

Q: An additional 100 Amp service switch will be installed in an existing service room with 1-600 Amp and 1-400 Amp service switches. What are the code requirements regarding the installation of supplementary grounding electrode (building steel or ground rod)? (11/10/2003)

A: Any addition to an existing service requires a supplementary ground. See Article 250-54.

SECTION 250-66

Q: A standpipe with 3/0 service conductors will be used to feed 3-100 Amp meters and 3-100 Amp service switches inside a building, via a trough. The service conductors will be tapped with

a. #3 AWG. What size grounding electrode conductor should be used? (12/10/2003)

A: #4 AWG. See Article 250-66.

SECTION 250-66

Q: Ten sets of 500 KCMIL service conductors will be run underground, from the endline box to the bottom fed service switchboard. The bottom of the switchboard is open and the conduits will be stubbed-up, while each conduit will have a bonding bushing and bonding wire. What table from the NEC should be used to determine the size of the bonding wire? (11/10/2003)

A: Article 250-102(c) references Table 250-66.

SECTION Table 250-102

Q: a. Does the NY City Electrical Code require to jump a water meter when the grounding conductor is connected before the water main valve?

b. If so, can two ground clamps with a single hole (no hub) and screw be used? (11/10/2003)

A: a. Yes, a jumper is required. See Article 250-102.

b. A minimum # 6 AWG conductor may be installed without mechanical protection by using 2 clamps.

SECTION 250-118

Q: Is an equipment grounding conductor required with EMT or metallic conduit? (1/8/2003)

A: EMT is acceptable as the required equipment grounding conductor, as is rigid metallic conduit or IMC.

SECTION 250-122(f)

Q: 11 sets of 500 KCMIL conductors (3 phase, 4 wire) run in separate conduits, fed at 120/208V by a 4000 Amp fused service switch. What is the minimum size of the equipment grounding conductor required in each conduit? (3/12/2003)

A: If installed in nonmetallic conduit, a 500 KCMIL conductor is required in each conduit, as per Article 250-122(f). If installed in metal raceway, no additional equipment ground is required. However, if an equipment ground is installed, the same rules for nonmetallic raceway would apply.

SECTION 250-30

Q: Is it allowed to obtain the neutral wire for a 208V, 3 phase apartment riser from a grounded step down transformer? All 4 wires will run in the same conduit, from the transformer to the apartment panel. (4/9/2003)

A: The derived neutral ground at the secondary of the 480-208/120V transformer may be used as the neutral wire.

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CHAPTER 3: WIRING METHODS AND MATERIALS (Code Section 300-1 to 384-37)

SECTION 300-22(b) and 300-22(c)

Q: A room that is used as an air mixing plenum contains air conditioning units. Is it permissible to install electrical panels, intended to serve lighting and appliance loads on the floor, within the air mixing plenum? (6/4/2003)

A: If the room is a mixing plenum, as defined in Article 100, Then Article 300-22(b) applies. If it is an air handling space, see Article 300-22(c).

SECTION 305

Q: Is it required to encase in concrete temporary (for 3 months) service conductors that exceed 10 ft in length? (2/5/2003)

A: Temporary service conductors do not require concrete encasement.

SECTION 310-15

Q: Is the neutral conductor allowed to be undersized and if so does it have to be derated? (1/8/2003)

A: When neutral current is anticipated, derating applies and shall be in accordance with the derating tables.

SECTION 310-15(b)(2)(a)

Q: Are the sections of conduit between switches and condulets considered nipples? (2/5/2003)

A: Conduit sections of 24 in or less, between switches and condulets, are considered nipples.

SECTION **336-20 and 370-3

Q: Is the use of nonmetallic boxes permitted in residential buildings? (3/12/2003)

A: Yes, when used in accordance with the product listing in residential buildings of 3 stories or less. See Articles 336-20 and 370-3 of the 1999 NEC.

SECTION 347

Q: Is it required for non-metallic conduits, installed under a concrete slab with rigid metal conduit elbows, to be encased in 2 inch of concrete? The question applies to residential occupancies exceeding 3 floors and non-residential occupancies. (5/7/2003)

A: Encasement in concrete is not required. See Article 347.

SECTION 347

Q: Is the new Section 347-2(2) of the NY City Amendments to be added immediately after paragraph 347-2(h) of the 1999 NEC? (5/7/2003)

A: Before paragraph (a), immediately following the new subsection 347-2(1).

SECTION Amended 347-1

Q: Is it permissible to use Schedule 40 PVC conduit on commercial underground lateral? (9/3/2003)

A: Yes. See amended Article 347-1.

SECTION 347-2

Q: Is it permissible to use PVC conduit to contain the down conductors of lighting protection systems? (5/7/2003)

A: The code does not allow the use of exposed PVC conduit in non-residential buildings, for any purpose. See amendment to Article 347-2.

SECTION 347-2

Q: Is it permissible to use PVC conduit for apartment communication wiring? (3/12/2003)

A: Yes, if installed in accordance with Article 347-2 of the 1999 NEC and associated NY City amendment.

SECTION 347-2(1)

Q: Is it permissible to use rigid non-metallic conduit (PVC) to protect the grounding electrode conductor against physical damage, in commercial or residential buildings? (7/9/2003)

A: No, for commercial buildings. For residential buildings, see amended Article 347-2(1) of the 1999 NEC.

SECTION Amendment 347-2(2)

Q: Is it permissible to use PVC conduit, encased in concrete and under a concrete slab, in a supermarket and retail space? (3/12/2003)

A: Yes.

SECTION 348-5(6)

Q: It is permissible to use EMT conduit for lighting in an above grade parking garage, that is open to the outside on two sides? The working height is approximately 7 feet, with no danger of physical damage or exposure to any corrosive elements. (3/12/2003)

A: No. The area described must be considered exterior and the possibility of physical damage can not be ruled out. See Article 348-5(6) of the 1999 NEC.

SECTION 350

Q: Is it permissible to use flexible metallic tubing in places of public assembly, as per Article 349-5 of the 1999 NEC? (5/7/2003)

A: The applicable NEC Article is 350.

SECTION 362-5

Q: Can the 40 conductors be installed in a feeder trough, between the service switch and the main distribution located about 55 feet away in another room? (5/7/2003)

A: Yes, subject to derating.

SECTION 362-5

Q: Can 40 conductors (10 sets) be installed, between the P.O.E. box and the service switch, if a major portion of the load is non-linear? Do they have to be derated in accordance with Article 362-5 Exception #1 of the New Code? (5/7/2003)

A: All conductors must be derated.

SECTION 362-5

Q: Would the derating apply to all 40 wires or would it apply to the number of conductors in excess of 30, as outlined in Article 362-5.  (5/7/2003)

A: All conductors must be derated.

SECTION 380-8(A)

Q: Is it permissible to install meter banks, plug-in circuit breakers or fuse pullouts with the bus bars 12 inches above finished floor? (9/3/2003)

A: The NYC Electrical Code does not impose a minimum mounting height for the mentioned equipment. See Article 380-8(a) of the 1999 NEC.

SECTION 384-31(a)(2)

Q: Do the current density rating requirements in the amended Article 384-31(a)(2) apply to all panelboards? (b) Can a manufacturer supply panelboards with the bus sized based on a UL temperature rise rating in lieu of density rating? (7/9/2003)

A: (a) Yes. The amended Article 384-31(a)(2) applies to service panelboards. (b) Yes, for other than service panelboards.

SECTION 384-37(a)

Q: a. How and where would an isolation barrier, between multiple service disconnects, be required to be mounted?

b. Is group mounting of multiple main disconnects in a chassis permissible or must each main be individually mounted and connected to the main horizontal bus (common service conductors)?

c. In what case, if any, is it permissible not to have these isolation barriers between multiple service disconnects? (6/4/2003)

A: a. Barriers are required at 460V and not required at 208V. Amended Article 384-37(a).

b. Above 800A, individual pressure switches are required. Amended Article 384-37(a).

c. See a. and b. above.

SECTION 384-37(b)

Q: Does amendment to Article 384-37(b) apply to all voltage levels? (6/4/2003)

A: The amendment applies to systems over 250V.

SECTION 384-37(c)

Q: a. Is a 12 inch transition section required between the main and feeder breakers in a single 480V incoming service arrangement?

b. Does this requirement pertain to spacing within a switchboard or switchgear lineup, sharing a common bus?

c. If so, where is the 12 inch transition section(s) required to be located?

d. If a UPS is considered to be a separate service, where is the 12 inch transition section(s) required to be located?  (6/4/2003)

A: a. No.

b. Only if energized from separate service take-offs.

c. Only one is required, and can be located on either side of the tie breaker.

d. N/A Amended Article 384-37(c) applies to a. through c. above.

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CHAPTER 4: EQUIPMENT FOR GENERAL USE (Code Section 400-1 to 490-74)

SECTION 410-76

Q: Is there a minimum mounting height for 277V fluorescent lighting fixtures? (12/10/2003)

A: No. See Article 410-76.

SECTION 424-12(b)

Q: Are enclosures for backflow preventers required to have heaters that could prevent the accumulation of water or other liquids in or on wired sections, electrical components or ductwork? Do the enclosures have to be listed as suitable for use in damp or wet locations? (4/9/2003)

A: Yes. All electrical components of the enclosures must be listed as suitable for use in damp or wet locations.

SECTION 424-12(b)

Q: Are the heaters for backflow preventer enclosures required to be wired to the power supply with liquidtight conduit, since they are subject to sprays of water? (4/9/2003)

A: This wiring method shall be suitable for wet locations.

SECTION 424-12(b)

Q: Can the heaters for backflow preventer enclosures be connected to the power supply by cord and plug? (4/9/2003)

A: No.

SECTION 424-12(b)

Q: Should the heaters for backflow preventer enclosures be installed at least six inches above the floor to prevent immersion? (4/9/2003)

A: Yes. They should be installed above the anticipated water level.

SECTION 430-109

Q: For a wheelchair lift, is a toggle switch with a lockable hasp acceptable as the disconnecting means at the unit? (11/10/2003)

A: The switch described is acceptable. See Article 430-109.

SECTION 450

Q: A high voltage electrical service is being considered for a new high rise office building, to be distributed via 13.8KV - 460/265V, 3 phase delta-wye transformers in customer owned multiple spot network installations. a. Would the spot networks, designed and built to Con Edison standards, be acceptable when maintained by the customer's qualified personnel? b. If so, please note the basis of the response. (10/8/2003)

A: a. No. Such installation would be subject to the amended Article 450 of the 1999 NEC and other applicable Articles.

b. Requires Advisory Board submittal for consideration.

SECTION 450-3 and 240-3(f)

Q: For power rectifiers rated 5KW and above, with input 208VAC and output 240VDC:

a. Does the output side require a disconnect means if the input side has one within sight?

b. Does the output side require an overload protection if the input side is fused at the proper size, not to allow overloading of the output side?

c. Is it acceptable to install a rectifier, for a DC elevator, that is not approved by a recognized testing lab (i.e. UL)? (2/9/2003)

A: a. & b. Yes in most cases. See Articles 450-3 and 240-3(f) of the 1999 NEC. c. No. See Article 110-2.

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CHAPTER 5: SPECIAL OCCUPANCIES (Code Section 500-1 to 555-11)

SECTION **500-3 and amendment

Q: What is the permissible type of wiring that can be used above a sheetrock ceiling of a hazardous material room? (1/8/2003)

A: All wiring within an area classified per Article 500-3 of the 1999 NEC and the associated amendment, shall be appropriate for hazardous locations.

SECTION 517-30

Q: Under the old code and per the committee's ruling of December 26, 2000 regarding hospital grade BX:

a. Is hospital grade armor clad (Type AC) cable approved for emergency branch circuit wiring?

b. Is hospital grade Type AC cable approved for normal branch circuit wiring? (11/10/2003)

A: On December 26, 2000 hospital grade BX (Type AC) was acceptable under the NY City Electrical Code in force at the time. NY City Electrical Code requires non-flexible conduit for emergency systems. See Article 517-30.

SECTION 517-30(c)(3)

Q: Can hospital grade BX, AC or MC cable be used for essential emergency branch circuit wiring in hospitals? (1/8/2003)

A: No. See Article 517-30(c)(3)

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CHAPTER 6: SPECIAL EQUIPMENT (Code Section 600-1 to 695-14)

SECTION 600-32(F)

Q: We are installing a fiberglass outdoor spectacular, with neon lights, in Time Square. Should PK housing be used for this application or turnbacks with rubber boots? (7/9/2003)

A: Insulators and bushing should be listed and approved for the purpose. See Article 600-32(f) of the 1999 NEC.

SECTION 605

Q: Request clarification of the requirements of amended Article 605 related to the connection of temporary desks which are equipped with receptacles and data outlets.

a. Is it permissible to cord & plug connect a duplex receptacle, permanently mounted on one such table, to a fixed receptacle on the wall or floor?

b. Same question with multiple duplex receptacles or surface metal raceway?

c. Is it permissible to interconnect multiple such tables with a single cord/plug connection to the fixed receptacle? (10/8/2003)

A: a. Yes b. No c. No

SECTION 605-4 and 605-6

Q: a. Is it permissible to use factory pre-wired office furnishing panels or partitions?

b. Is it permissible to use "quick connect" power entry accessories for free standing partitions?

c. Is it permissible to use "quick connect" power entry accessories for fixed partitions? (11/10/2003)

A: a. Yes. Advisory Board calendar # is still required for all equipment. See amended Article 605-4 and Section 27-3017 of the Administrative Code.

b. A "quick connect" is not considered permanent wiring. See amended Article 605-6.

c. Permanent wiring is required. Same as b.

SECTION 620-12(a)

Q: Is it permissible to continue using #14 AWG elevator traveling cable until the new required #12 AWG cable can be redesigned? (10/8/2003)

A: Indefinite continued use of #14 AWG cable for this purpose will be allowed, if it is properly protected by an overcurrent device. Voltage drop must be considered.

SECTION 695-3(a)

Q: Amendment 695-3(a)(1) requires that the fire pump service not be in the same cabinet or vertical section as the service disconnect. In 460/265V installations, there is a barrier between sections per other code requirements, while for 208/120V service installations there is no barrier between sections. Is a barrier or separate mounting required for the fire pump service? (6/4/2003)

A: A barrier or separation is required, as per Article 695-3(a).

SECTION 695-3(a)(1)

Q: (a)Where should the fire pump tap or disconnect be located when the power is fed to the service switchboard from a network vault located inside or outside the building? (b) Where should the fire pump tap lugs be located when the power is fed from a service end-box? (7/9/2003)

A: (a) & (b) In a separate enclosure, ahead of the main service switch. See amended Article 695-3(a)(1).

SECTION Amended 695-3(a)(1) & 695-4(b)(2), also 230-72(b)

Q: Is it permissible, per the NYC amendments to the 1999 NEC, to install the following: (a) More than one (Manual & Automatic) fire pump service switch in a switchboard section that is barried from other sections and from each other by Glastic barriers? (b) A fire pump service switch in the bottom part of a switchboard CT section if barried from other sections and from each other by Glastic barriers? (7/9/2003)

A: (a) & (b) No. See amended Articles 695-3(a)(1) and 695-4(b)(2), and Article 230-72(b).

SECTION 695-6

Q: A stand alone fire pump service switch is mounted within 5 ft of the line side tap of the main electric service switch and in the same room. What are the cable and conduit requirements between the tap and the fire pump service switch? (5/7/2003)

A: Threaded rigid conduit and THHN conductors or equivalent are required. Concrete encasement is not required if within the same room. See Article 695-6 0f the 1999 NEC.

SECTION 695-6(b)

Q: Is it permissible to use RHH type cable in EMT for fire pump wiring? (1/8/2003)

A: Any cable assembly in conformance with Article 695-6(b) of the 1999 NEC can be used for fire pump wiring.

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CHAPTER 7 SPECIAL CONDITIONS (Code Section 700-1 to 780-7)

SECTION 725-52  

Q: Is it permissible to utilize exposed thermostat, in a commercial building, from a Class II transformer with inherently limited power? The thermostat cable will be plenum rated, where required, and will not be subject to mechanical injury. (4/9/2003)

A: Yes, as per Article 725-52.

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CHAPTER 8 COMMUNICATIONS SYSTEMS (Code Section 800-1 to 830-58)

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TABLES (Detailed requirements for conductors and conduits)

SECTION Table, Note 4

Q: Are the conductors inside nipples subject to derating? (2/5/2003)

A: The conductors inside nipples are not subject to derating, but can not exceed 60% fill.

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ADMINISTRATIVE GENERAL REQUIREMENTS 

SECTION Local Law 64/01

Q: Is a low voltage installer allowed to perform installation of fire alarm wiring? (1/8/2003)

A: A low voltage installer is prohibited from performing fire alarm work.

SECTION Administrative

Q: How should the industry view all of the interpretations that the code committee made previously, having been based on another code? (2/5/2003)

A: In general, old interpretations will be superceded by the new code. Future interpretations will be based on the code in effect on the filing date.

SECTION Administrative

Q: Is the "old code" still valid for any work in progress or for work already designed but not yet installed? (2/5/2003)

A: For jobs filed through June 30, 2003, the old code may be applied.

SECTION Administrative

Q: Are there any conditions for which "old code" installations will be grand- fathered or allowed, e.g., installations made in buildings constructed prior to January 1, 2003? (2/5/2003)

A: The date of filing for each job will determine which code applies. For a short period of time after July 1, 2003, exceptions may be granted on a case by case basis.

SECTION Administrative

Q: Construction will start after December 31,2002 on jobs designed and awarded before December 31, 2002 but mobilization commences after December 31,2002. Is the 2001 New York City Electrical Code applicable to the work to be constructed? (2/5/2003)

A: The date of filing determines which code applies: prior to January 1,2003, the old code applies; between January 1, 2003 and June 30, 2003, either code applies; after June 30, 2003, the new code applies. Variances may be granted on a per case basis.

SECTION Administrative

Q: Design and bidding are complete before December 31, 2002 but award and mobilization occurs after December 31,2002. Is the 2001 New York City Electrical Code applicable to the work to be constructed? (2/5/2003)

A: The date of filing determines which code applies: prior to January 1,2003, the old code applies; between January 1, 2003 and June 30, 2003, either code applies; after June 30, 2003, the new code applies. Variances may be granted on a per case basis.

SECTION Administrative

Q: Work is in progress on jobs which were designed and awarded before December 31, 2002. Is the 2001 New York City Electrical Code applicable to the work areas to be constructed after December 31, 2002? (3/12/2003)

A: The date of filing determines which code applies: prior to January 1,2003, the old code applies; between January 1, 2003 and June 30, 2003, either code applies; after June 30, 2003, the new code applies. Variances may be granted on a per case basis.

SECTION Administrative

Q: We are manufacturers of architectural lighting products that are ETL listed. Do our standard (catalog) products still require Advisory Board calendar numbers? (7/9/2003)

A: No. Standard products that are listed by a Nationally Recognized Testing Laboratory (NRTL) do not require calendar numbers. Products must also meet construction requirements of the NYC Electrical Code.

SECTION Administrative

Q: (a)When do the provisions of the new 2003 NYC Code officially take effect? (b) Is the 180 Day extension, by the Commissioner, for new equipment to be applied within this period or on all applications for new work which are based on old NYC Code standards? (c) If a project was designed and begun prior to January 1, 2003, but construction has been delayed and will not be completed by the end of 2003, will the equipment supplied need to meet the Old NYC Code standards or the new NYC Code standards? (d) If the equipment is completed and delivered to the contractor or site but not installed, will it be required to be upgraded to meet the new NYC Code standards? (7/9/2003)

A: (a), (b), ( c) & (d) The 1999 NEC plus amendments is the 2003 NYC Electrical Code.

SECTION Administrative

Q: Can a Mineral-Insulated (MI) cable be installed in the fire tower of a building? (11/10/2003)

A: Type MI cable is suitable for such an installation subject to other jurisdictions.

SECTION Administrative

Q: What are the requirements for performing electrical maintenance and testing in NY City, and where can these requirements be found? (12/10/2003)

A: All electrical work, including invasive testing, requires a license. See Sections 27-3004, 27-3017 and 27-3018 of the Administrative Code.

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 *  All interpretations are based on the 1999 NEC and associated NY City amendments.

 ** Whenever there are a few sections referenced, the first one is the "lead section", and the rest are secondary sections. All the secondary sections are referenced with the purpose of offering additional clarifications.

The NYC 2011 Electrical Code – Administrative Provisions and 2008 NEC Amendments is now on sale on the CityStore.

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