2017 Code Revision and Interpretation Committee Code Interpretation
(Last Updated: May 23, 2019)


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 2008 edition of the NEC and the associated NYC Amendments to the 2008 NEC , as well as (Local Law 39/11) that went into effect on March 1, 2012.

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 110.1 to 110.79)
CHAPTER 2: Wiring and Protection (Code Section 200.1 to 285.28)
CHAPTER 3: Wiring Methods and Materials (Code Section 300.1 to 398-104)
CHAPTER 4: Equipment for General Use (Code Section 400.1 to 490.74)
CHAPTER 5: Special Occupancies (Code Section 500.1 to 590.7)
CHAPTER 6: Special Equipment (Code Section 600.1 to 695.14)
CHAPTER 7: Special Conditions (Code Section 700.1 to 770.182)
CHAPTER 8: Communications Systems (Code Section 800.1 to 830.179)
CHAPTER 9: Tables (Table 1 to 12(B))
Articles: A subdivision of a Chapter, comprised of a certain number of Sections
Administrative: General Requirements

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.**

 

Chapter 1: General (Section 110.1 to 110.79)

Sections 110.25 & 110.26 - (4/13/2017)

Section 110.25 of the NYC 2011 Electrical Code Technical Provisions states, "Electrical Closets ... shall be sized to provide the applicable working space requirements ... " If I have a 4000A Switchboard located in a new buildings electrical room and a working clearance that is twice the required space in front (front only) of the Switchboard, as stated in the 2014 NEC ArticaI110.26(C)(2)(b); Will a single entrance be acceptable for this space?

Section 110.26 of the NYC 2011 Electrical Code Technical Provisions states, "Add new Subsection 11 0.26(H); All new network compartments shall have at least two means of access." What is the definition of a network compartment? Is it referring to a communication network closet?

Yes, where double the 1000kVA clearance is provided and a person will not be required to walk in front of electrical equipment to reach all service switches.

No, it is not referring to communication network closet. Network compartment (Network Protector Compartment): Is structure containing a network protector and paralleling bus. A service take-off and/or a 460 Volt disconnect switch may also be included. Construction requirements for transformer vaults and network protector compartments, on 265/460 Volt installations, are described in Con Edison Specification EO-5023 of Construction Standards Manual No. 3.

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Section 110.26 - (4/13/2017)

There is a new residential high rise building with two electrical closets located in the corridor of every floor (43 floors). Electrical panelboards serving the apartments will be installed every third floor in each electrical closet.

Electrical work space for these panels is achieved when the electrical closet door is opened. The top of the panelboards are 8'-0" AFF. The top of the door opening is 7'-0" AFF. The panelboard will be provided with a non-removable cover 1'-6" from the top of the panelboard. The removable door cover will be entirely within the door opening. Refer to the attached sketch: 20170208-QPRD-SKETCH-PANELBOARD.

There is 6" from the non-removable cover of the panelboard to the inside wall of the electrical closet. There is 5' working space in front of the removable cover when the electrical closet door is open.

Does this installation violate section 110.26 Spaces About Electrical Equipment of the NYCEC? In particular, the non-removable cover above the door head jamb.

No. This installation is in violation of section 110.26(A)(3) and 110.26(E) where the minimum headroom shall not be less than the height of the equipment.

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Section 110.34(A) - (4/13/2017)

There is a question as to the physical dimensions of what constitutes Front Accessible Standards. The "rule of thumb' has been 36" or less in depth, with connections & cable terminations within 30" of the front of the enclosure.

Nema Standards Publication PB-2-20 11 defines the following [See Attached, Definitions, Page 3];
"An enclosure in which incoming and outgoing field termination points are accessible from the front. Other connections shall be permitted to be rear or side accessible. If necessary, a limited number of barriers or covers shall be permitted to be removed to achieve this accessibility."

UL's Marking and Application Guide for Dead-Front Switchboards, January 2012 states in the glossary [See Attached Glossary, Page 6];

"Accessible, Front- An enclosure in which all bus and device connections are accessible from the front. If Necessary, a limited number of devices shall be permitted to be removed to achieve this accessibility.

The National Electric Code and NYC Amendments, 110.34, Table A, have quantitative values for side and rear clearances, both for service and distribution equipment. The allowable depth of a service switchboard impacts all the clearances in a service room. Can the ECRIC issue a definitive measurement, as a new amendment to 110.34, defining the depth of equipment installed as front accessible?

The electric code does not specify a maximum depth for front accessible assemblies. And where incoming line termination, main device connection and all bolts used to join current-carrying parts shall be installed so as to permit servicing from the front only so that no rear access is required.

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Section 110.26 - (6/8/2017)

Bollards installed in front of electrical equipment must be removable.
Question: Please clarify if the listed below is considered removable.

  1. Bolt down bollard. The bollards would have to be unbolted to be removed.
  1. Working space for equipment shall be provided and maintained per subsection 110.26(A) to permit ready and safe operation of such equipment. The placement of bollards within working space, even if they are removable is prohibited, since they don’t permit ready access to the equipment.

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Section 110.2(B) - (8/3/2017)

We have a project that requires the installation of a temporary (rental) 480V, 1500KW standby rated / 1350KW prime rated diesel generator for the powering of temporary remediation equipment for a period of approximately 9 months. This generator will be the primary power source for the remediation equipment. Does this installation require a submission for approval with the Electrical Advisory Board based upon section 110.2(B) in the electrical code NYC amendments?

Yes. The above proposed installation is included and listed in the intent of subsection 110.2(B).

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Section 110.26 and 110.34 - (8/3/2017)

A hospital is proposing installing new lavatories above rooms listed below with waste piping run in the following electrical rooms. All piping would be run at a minimum of 6 1/2' above any electrical equipment.

A) A 2500kVA 4160V to 277/480V double ended substation and distribution room.

As this installation is in excess of 600V does it comply with 110.34(F)?

B) An emergency distribution room containing a 6000A 277/480V paralleling switchboard and associated ATS. All building loads except for normal lighting are fed thru ATSs.

Does this installation comply with 110.26(F) or as it is in excess of 1000kVA is there another controlling section?

A) No. Subsection 110.34(F) prohibits foreign systems which require periodic maintenance or whose malfunction could endanger the operation of the electrical system shall not be installed in the vicinity of such equipment. Additionally, since the building is a hospital, which is considered critical facility, such aforedescribed installation might compromise the hospital operation and patients’ safety.

B) Subsection 110.26(F) permits foreign systems above 6 ft. of the 600V electrical equipment where protection is provided but such installation still poses a hazard to patients’ safety. Additionally, NYC Building Code, section 2702.1.7.2.1 prohibits foreign systems in ATS and emergency power system rooms if such systems are not associated with the emergency or standby power system. Based on the foregoing, your described installation doesn’t comply with codes and is hereby prohibited.

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Sections 110.34(A) - (8/3/2017)

Problem: Confusion between definitions Article 100 and 110.34.(A)

Article 100
Dead Front. Without live parts exposed to a person on the operating side of the equipment.

Exposed (as applied to live parts). Capable of being inadvertently touched or approached nearer than a safe distance by a person.
Informational Note: This term applies to parts that are not suitably guarded, isolated, or insulated.
Today all equipment is built as “dead front” type. It means at least for me that energized parts are not visible and are “guarded, isolated or insulated”.

Article 110.34
Distances shall be measured from the live parts, if such are exposed, or from the enclosure front or opening if such are enclosed.

Then this article should look for the distance between the enclosures! Does not matter where are the “live parts”!
In addition sheetrock, stone and other construction materials should be considered as “grounded”, especially for High voltage installations.
Attached are relevant copies of the Code.

The measurement shall apply from the front of equipment’s enclosure, or the furthest intruding point at the enclosure such as handles of switches. Walls of construction type as you have described are considered grounded surfaces.

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Section 110.26 - (12/7/2017)

A school project for Electrical service upgrade is being design. The building was built in 1939. The service capacity has to be upgraded for additional loads. The existing service equipment location doesn't have enough space to accommodate the new equipment. An available space in existing Fan Room is being proposed to locate the new service equipment. The room housed the motors for HVAC fans located above the Mezzanine.

  1. Are the new service equipment and main distribution board for existing building with limited space are required to be in dedicated electrical room or closet?
  2. A proposed 1600A, 208V, 3Ph, new service equipment (less than 1000KVA) will be located in a corner space of the Fan room and provided with required working space. Fan Room doors are provided with panic bar.  To protect the equipment, a wire mesh fence with two personnel doors at each end will be provided. Are these acceptable?  Attached is the proposed layout.
  1. Dedicated electrical equipment room is not required; the proposed electrical space shall be in accordance with section 110.26.
  2. No. The attached proposed layout violated section 110.26(C)(3) and ladders are not permitted as a legal egress means.

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Section 110.26(C)(3) - (12/7/2017)

NEC-2008, section 110-26 (C), (3) requires that personnel doors for entrance to electrical rooms housing equipment rated 1200A and greater open in the direction of the egress and be provided with panic hardware.

Question: When performing work on existing electrical equipment rated 1200A and greater installed inside existing electrical rooms not in compliance with the above mentioned code section, under which of the following scopes of work would the existing electrical room doors need to be replaced to conform to the requirements of the above mentioned code section:

  1. Existing electrical equipment will remain but it will be modified to accept new building loads. This includes modifications such as using spare over-current protection devices, replacing or adding over-current protection devices, replacing or adding distribution sections, etc.
  2. Existing electrical equipment will remain but new electrical equipment is being added inside the existing electrical room. Equipment additions such as new meters, new distribution panels, new lighting and appliance panels, etc.
  3. Existing electrical equipment will be replaced in kind (same rating) due to water damage.
  4. Existing electrical equipment will be replaced with new equipment of larger capacity (power upgrade work).
  1. No. Existing electrical equipment closet is not subject to section 110.26(C)(3)
  2. No. Existing electrical equipment closet is not subject to the above provision as long as the new equipment is rated less than 1200 amps.
  3. Yes. Installation shall comply.
  4. Yes. Installation shall comply.

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CHAPTER 2: Wiring and Protection (Code Section 200.1 to 285.28)

Section 210.19 – (2/2/2017)

Is 14 Gauge wire allowed to be used for the elevator hoist way and machine room. Section 210.19 (A)(4) references table 210.2 where an elevator would be excluded from the minimum 12 Gauge requirement?

Unless otherwise amended by other articles, No. #14 AWG is not permitted to be used under subsection 210.19(A)(4) as amended by 2011 NYC Electrical Code.

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Section 240.24(E) - (2/2/2017)

Subsection 240.24(E) doesn’t permit overcurrent devices to be located in bathrooms. If we are to install an electrical panel in millwork or recess inside a wall provide with access door in such a space, would this satisfy the code and the panel is considered outside the bathroom area?

No, the electrical panel is still considered in the bathroom space.

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Section 250.146(B) - (2/2/2017)

Is it required to install a bonding jumper from the receptacle grounding terminal to the outlet box when using self-grounding receptacles with flush type metal boxes and BX or MC Cable?

No, self-grounding receptacle is not required to be connected with bonding jumper where the installation complies with subsection 250.146(B), additionally; MC equipment grounding conductor shall be bonded to the box.

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Sections 220.54 – (4/13/2017)

Can the combo washer/dryer unit, LG WM3997HWA, be counted as a washer, instead of as a dryer, while calculating the load of a residential unit?

Support: The question is how to characterize the above mentioned electrical washer/dryer unit when calculating the load requirements. The co-op's reviewing electrician (lP Group Engineers, 648 Broadway, No 400. NY, NY 10012) is counting the unit as an electrical dryer and using a 5000VA load (section 220.54 of NEC 2008).

We feel that this unit can be designated as a washer (and does not require section 220.54) based on the following information:

  1. The unit only requires a standard, 3 pronged (grounded) plug and outlet instead of a 30A, 240V, 3 wire or 4 wire #10 AWG copper conductor wire connected to a 4 wire outlet
  2. lt only requires a 120 VAC, 60Hz outlet instead of the need for a 240 VAC, 60Hz single phase circuit fused at 30A at both sides of the line
  3. An electrician is NOT required for installation of the unit

l've included the instruction manual for the LG WM3997HWA.

Yes, this appliance is permitted to be calculated as a washer where 1500 VA has been provided for laundry circuit.

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Section 230.6 – (4/13/2017)

If installing service entrance conductors from the service entrance box in the basement to switchgear on the 4th Fl can FRE be used encased in concrete?

Yes. Since the proposed installation considers the conductor outside the building.

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Sections 250.24(A) &(C) - (4/13/2017)

Does a 30 amp fused disconnect switch for a Pre·Action fire alarm system require a #10 AWG neutral conductor or a # 8 awg that matches the the #8 grounding conductor as per article 250-66. The FDNY Inspector has stated that the grounded conductor must match the grounding conductor per article 250-66.

No. Section 760.33(A) permits #10 for grounding electrode conductor, and the grounded conductor is governed by section 250.32

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Section 240.24(B) – (4/13/2017)

Article 240.24B: Each occupancy shall have ready access to all overcurrent devices.

B2: This is an exception that applies to Hotel Guest Suites without provisions for cooking.

We are asking special permission for the following:
In a new multi-apartment building, the Developer wishes to utilize an emergency receptacle controlled by an overcurrent device (that is not located within the residence) as one of the kitchen appliance receptacles. These are condominium apartments with cooking facilities and full-time maintenance personnel.

Please forward all electrical special permission requests to NYC Electrical Advisory Board with documented hardship and proposed safe alternative meeting code intent.

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Sections 250.66 & 250.122 - (4/13/2017)

DLO/ Welding cable when dual listed as RHW/ RHH and UL 854. The cable is used as general building wiring;

  1. Is this cable in conduit permitted to be used at 90 deg. temperature rating in accordance with T310.16 as RHH?
  2. Is this cable permitted to be used in accordance with T310.18 ampacity as TC?
  3. When used as a Service Entrance Cable and bonding is required, is the 90 deg. temperature rating is permitted to be used, or bonding must be provided per T250.66 using wire gauge size?
  4. When used as feeders with equipment grounding conductor, is 90 deg. temperature rating is permitted EGC or wire gauge per T250.122?
  1. Yes, and in accordance with the provisions of subsection 110.14(C).
  2. Yes. Where listed as TC and used in cable tray application and installed in accordance with section 392.11(A) or (B).
  3. No. Service ground electrode and service switch line side bonding shall be in accordance with T250.66. Temperature rating of insulation is irrelevant.
  4. No. Equipment grounding conductor and service switch load side bonding shall be in accordance with T250.122. Temperature rating of insulation is irrelevant.

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Section 210.52 - (6/8/2017)

As per NEC 2008 210.52(C)(5) Receptacle outlets shall be located above, but not more than 20in above the counter top.
Exception to (5): receptacle outlets shall be permitted to be mounted not more than 12in. below the counter top could be applied with the conditions

  1. Construction for the physically impaired
  2. On island and peninsular counter tops.

As per Architect request kitchen small appliance outlets for new apartment building in NYC should be accessible for physically impaired persons for all apartment's kitchens (even if they are not designated specifically for physically impaired persons at floor plans) and located below counter top.
Please see the attached sketch as example and advise if this installation is compliant with 2008 NEC 210.52(C)(5).

No. As per the provided sketch of the typical kitchen layout, it is in violation of ICC/ ANSI A117.1-2, Accessible and Usable Buildings and Facilities, where the counter top is required to be equal or less than 34”, also, the microwave is not a code compliant too.

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Section 230.64(B)(5) - (6/8/2017)

We would like to inquire about the egress door requirement for electrical service room with equipment more than 1200 Amps. Is it possible to have one exit door in the hallway and the other through another room? The other room could be a mechanical room or a storage. Please explain.

Yes, as long the other room leads to a legal egress and a person will not be trapped in such space. Where such equipment is part of 1000kVA Service Equipment Room, the installation shall comply subsection 230.64(B)(5).

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Section 220.14 - (6/8/2017)

I am preparing a Load Letter to determine the size of a new riser wire for an apartment.
Can 2 central Air conditioning units be included in the small appliance branch circuit demand factor as stated in Article 220 section 14 Subsection (M)?

No.

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Section 220.42, 2008 NYC EC & Paragraph B30-157.5, 1987 NYC EC - (8/3/2017)

The firm of Lawless & Mangione is designing an electrical system upgrade to a fourteen building multi-family residential complex in upper Manhattan. The complex was built in 1962 and at some time during the 80’s, Elect. risers were installed throughout for room type A/C units with small CB load centers in each apt. Each building has a master Con Ed meter. The riser and panels are in good condition. L&M would like to keep the risers as is. My question is can we use para B30-157.5 of the old NYC electrical code to analyze the risers to confirm how many bedroom A/C units in addition to a LvRm A/C units can be accommodated on the risers.

No. The application of previous codes is not permitted per administrative EC section 27-3024(a). The current NYC EC mandates 1500VA per individual circuit servicing AC unit, and permits adding the allowance to the general lighting load and subject to demand factor of section 220.42.

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Sections 210.5, 200.6 & 250 - (10/12/2017)

A sprawling four city block facility undergoing a multiple phased switchboard replacement project may require the re-tasking of existing feeders 350 MCM or larger from 208V to 480V to shift capacity to parts of the building. Separation of systems in common pull boxes will be achieved either by barriers (flexible conduit sleeves or solid panels). There will be no article 695, 700, 701, or 702 feeders in the raceway system.

  1. Can 600V THHN ungrounded conductors formally operating at 208V with black, red, and blue jackets installed within raceway be re-identified with colored tape at all pull boxes, splices, and termination points utilizing brown, orange, and yellow color system for use as 480V, given this is the identification system in use at the facility?
  2. Can the 600V THHN grounded conductor (neutral) be re-identified from white to gray via colored tape at all pull boxes, splices, and termination points?
  3. Can the 600V THHN insulated equipment grounding conductor, larger than #6 in size, remain green without yellow stripe?
  1. Yes
  2. Yes and where different systems are in the same conduit, cable, box or other type of enclosure, each grounded conductor shall be identified per section 200.6(D).
  3. Either identification is acceptable. Please note equipment grounding conductors are only required to be marked at accessible locations only, see 250.19(A)

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Section 210.52(A)(1) - (10/12/2017)

210.52(A)(1) states that receptacles in a dwelling unit are to be placed such that no point measured horizontally along the floor line in any wall space is more than 6ft from a receptacle outlet.

In the image attached, receptacle 'C' is separated from receptacle 'B' by a full height glass window. The wall containing the glass window and the adjacent southern wall meet at approximately 60 degrees. Receptacle 'B' is 4ft. west of the receptacle labeled as 'A', giving a total linear separation of receptacles 'A' and 'C' along the wall of 12'-1" + 4'-6" = 16'-7".

  1. In reference to the receptacle labeled as 'B' in the image attached, is it true to say that this receptacle is not required by the Code as long as receptacles 'A' and 'C' alone are placed as noted, because in their current positions, they capture all points along the wall space dimensioned with 12'-1" and even overlap their coverage at some points (indicated by the hatched portion of the two circles), ensuring that there is no position along said wall space more than 6ft. away from a receptacle?

The measurement is taken linearly along the wall. Cords placed away from the wall are a tripping hazard and subject to physical damage, hence the radius coverage is not the intent of this provision.

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Section 220.84(A) - (10/12/2017)

Per NEC Art. 220.84 (A), the Optional Method may be used to calculate the load on a feeder serving three or more dwelling units if the following three conditions are met:

  1. No Dwelling Unit is supplied with more than one feeder.
  2. Each dwelling unit is equipped with electric cooking equipment.
  3. Each dwelling unit is fitted with either electric space heating, or air conditioning, or both.

We are currently designing a residential high-rise and are in compliance with condition 1 and 2.

In regards to Condition 3: all Apartments are heated via FCU's, Electric Radiators, and Heat Mats. Electric Radiators and Heat Mats are not the primary form of heating, they are supplemental to the hermetic system. In qualifying for the optional calculation, the NEC does not specify whether electric space heating is supplemental or is the primary means of heating the space, just that it is permanent, and Electric Radiators and Heat Mats are referenced as Electric Space Heating.

Can we use the Optional Method to calculate the load on a feeder in this case?

Yes, where the supplemental electrical heating is connected to the dwelling’s electrical feeder (electrical panels).

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Subsections 230.82(6) & 690.14(A) - (10/12/2017)

  1. Do solar system when is connected to the line side of utility (Con Edison) become a separate service and we need to comply with Grouping the service switches and the ruling of running service wires in hollow spaces?
  2. Do we need a Safety switch (fused or unfused) outside the house for the solar system on the roof, If the system is connected on a back feed breaker in the main service panel of the house?
  3. When installing solar system, do we need to install a jumper wire across water meter when the existing house water ground is in good condition?
  1. PV disconnecting means is permitted to be connected to the supply side of service disconnect, 230.82(6), and not be required to be suitable as a service equipment, 690.14(A); hence not required to be grouped and installed either on the outside or inside nearest the point of entrance of the system conductors, 690.14(C)(1).
  2. See answer to above.
  3. Where the grounding system is code compliant and not modified, it shall be permitted to remain. The PV disconnect is not a service disconnecting means.

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Subsection 210.52(C)(3) - (12/7/2017)

Peninsular counter space separated by range top with depth of counter behind the range top is less than 12” is considered to be two separate counter spaces [Section 210.52(C)(4)]. However in our case, the depth of counter space behind the ranger top is more than 12” hence we are considering this peninsula to be a single peninsular space and providing one outlet at the connecting edge of the peninsula as per section 210.52(C)(3).

Please advise if one receptacle acceptable per the referenced code section and installation shown in the photos? Two photographs have been attached for your review.

At least one receptacle outlet is required, however, the receptacle shown in the photo is located more than 12” from the counter top and more than 6” of overhang. See Exception to 210.52(C)(5), receptacle outlet location.

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Section 240.21 - (12/7/2017)

Inquiry: Gentlemen, please see question below regarding Article 240.21
Comment: We recently received an objection on our DOB inspection regarding to 240.21. We have a 75KVA transformer 3wire 460 primary/ 4Wire 208/120 secondary. (see attached diagram) The secondary conductors (4 # 3/0 copper) are 6' long and feed a 200 amp main breaker panel. The inspector stated that the secondary conductors need to be upsized to 4/0.

  1. Do the secondary conductors need to be upsized to 4/0?
  2. If so, why would this be needed if the conductors are going to a main breaker?
  1. No.
  2. N/A

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CHAPTER 3: Wiring Methods and Materials (Code Section 300.1 to 398-104)

Section 312.8 - (2/2/2017)

I have a 2,500 Amp Con Edison End of Line Box.
A 2,000 Amp Service Switch is mounted next to it.
The 2,000 Amp Service Switch was used as a "Pull Box " for a 400 Amp ground floor store Service Switch and a 30 Amp fire Alarm signal service switch.
Can service conductors pass though service equipment?

Yes, where the service conductors are grouped together and the service switch has adequate gutter space in accordance with section 312.8.

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Section 332.80(B) - (2/2/2017)

If single MI conductors are grouped together as per article 332.31 and 332.80(B) and ran in an enclosed riser shaft without fresh air, would that shaft still be considered "Free Air"?

Yes, where the installation complies with 332.31 and the required space in subsection 332.80(B) is provided, then Table 310.17 can be used for the MI amapcity.

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Sections 352.10(I) & (J) - (2/2/2017)

In reviewing code articles 352.10(I) & (J) in the 2011 Technical Provisions it seems to contradict itself regarding the use of PVC in a residential building. 352.10(I) states that you are permitted to use PVC in a residential building or dwelling unit not exceeding 3 floors. Then directly under it in (J) Non-Residential Use it says it is permitted in residential buildings over 3 stories unless prohibited elsewhere by other articles of this code. That seems to point to 352.10(I) that states it is not permitted under these some conditions.

Is PVC conduit permitted to be run concealed within non-plenum walls, floors & ceilings where the walls, floors and ceilings provide a thermal barrier of material that has at least 1 hour rates assembly as identified in listings of fire rated assemblies?

Yes. PVC is allowed to be installed in buildings over 3 stories when provided with one hour thermal barrier.

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Section 300.3 – (6/8/2017)

Can conductors of low voltage DC power, typically below 48V, share a common conduit with AC power conductors at 240V AC?

In NYC Electrical Code, Local Law SECTION 300.3
Subsection 300.3(C)(1)(a) – Add a new subsection 300.3(C)(1)(a) to read as follows:

  1. Barriers shall be provided to isolate conductors energized from different sources when system voltage exceeds 250 volts nominal and conductors are protected by first or second level overcurrent protective devices. Sources include service entrance points, secondaries of different transformers, generators and UPS systems.

So can Solar PV DC conductors be run along with 120V AC lighting conductors, in the same conduit, for instance?

No. This section is irrelevant to the question. PV source circuits and PV output circuits shall not be installed in the same raceway, cable tray, cables etc. unless the conductors of different systems are separated by a partition, see Subsection 690.4(B).

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Sections 300.1(B), 2014 NEC – (8/3/2017)

Article 300.1(B)
Problem-the manufacture is using conductors listed in table 310.13(A), claiming that they (conductors) are part of integral part of equipment, such as motors, controllers, motor control centers, or factory assembled control equipment or listed utilization equipment.” This problem I had with Sq D and ABB transformers. It took many months for them to change the wiring and to comply with the Code.

Integral parts of Equipment are not covered in this code. Where a manufacturer has defective or wrong parts, you may file a field complaint with the listing lab against the manufacturer.

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Section 314.3 – (8/3/2017)

We are planning to install floor boxes PVC non-metallic in apartments that are located from 5th floor up to 64th, due to curtain wall installation and no wall space. These boxes will be above Slab in a little niche, Finish Floor will take 2-1/2" this will cover required depth for the box.
Please advise if we can install them.

No. The product instructions provided in the catalogue sheets are contrary to the listing of the product use, and shall comply with subsection 652.10(J).

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Subsections 310.15(B)(4)(a) & (b) – (10/12/2017)

NEC Sec. 310.15(B)(4) states: (a) A neutral conductor that carries only the unbalanced current from other conductors of the same circuit shall not be required to be counted when applying the provisions of 310.15(B)(2)(a).
(b) In a 3-wire circuit consisting of two phase conductors and the neutral conductor of a 4-wire, 3-phase, wye-connected system, a common conductor carries approximately the same current as the line-to-neutral load currents of the other conductors and shall be counted when applying the provisions of 310.15(B)(2)(a).

I am designing a high-rise residential building fed via a 7-wire residential distribution system where a common neutral conductor is shared between three apartments and tapped to feed each Apartment Panel with a full sized neutral.

The common riser contains:
(6) Phase Conductors
(1) Over-sized Neutral Conductor

Do we consider the Neutral a CCC when in the common riser? It seems that since all six phases are present that the neutral would only be carrying the imbalance from the three phase circuit and therefore not be included. As a note when the neutral is tapped to feed each individual apartment panel we are considering it a CCC as per 310.15(B)(4)(b).

Neutral conductor is not considered a current carrying conductor in your proposed installation.

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Section 330.12 – (10/12/2017)

I have situation where the client is requesting floor outlets in the Gym (2nd fl) of multifamily building. Rouging is to be retrofitted in to existing concrete slab. Problem is that there is not enough depth to galvanized conduit without removal of the steal re-bars - Because of this condition building’s engineer specified PVC jacketed 12/2 MC cable to be used for this application. Fortunately we had an inspector on site and he told us that this installation will never pass (according to his interpretation of the NEC section 330.12) so I have done some research and according to the Q-A from DOB site it seems it would be OK to use it. This is what it says:

Section 330.12 - (10/3/2012)

  1. We reference the NYC Electrical Technical Provisions and Amendments of 2011, Article 330, Metal-Glad Cable, Type MC.

    As stated in these paragraphs 330.12, (4) and (5), "Uses Not Permitted":
    Paragraph (4): Where the cable has an outer jacket of PVC, in residential buildings exceeding 3 floors above grade.
    Paragraph (5): Where the cable has and outer jacket of PVC, in any nonresidential building unless concealed within non-plenum walls, floors and ceilings where the walls, floors and ceilings provide a thermal barrier of material that has at least a 1 hour rated assembly as identified in listings of fire rated assemblies.

    a. Is use of MC cable with outer PVC jacket permitted in concrete slabs of a multi dwelling building over 3 stories, provided cable does not extend beyond concrete slab?

    Yes, with concrete cover that provides 1-hour fire rating.

Yes. Interpretation is valid.

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Subsection 300.3(C)(1)(a) - (12/7/2017)

We have a condition where we are installing a transformer to step up voltage from 208/120 to 480/277. The 480V conductors will be entering an existing raceway system that leaves the service room. 10 of the feeders in the existing raceway system will be 208 volt supplied by second level OCPD via two 1600A switches. 4 of the feeders will be from our 750 KVA transformer. The transformer will be also fed from a second level OCPD in the service room and will be provided with secondary OCP. Two of the second level switches are fed from one 1st level 4000A SSW, and the other is fed from another 4000A service takeoff in the room. All wire is 600V THHN/THWN. See image.

Are barriers necessary?

We researched previous interpretations and found one in 2012 that stated 300.3(C)(1)(a) only applied to conductors at incoming services and between 1st and second level devices. After the second device there are no issues, which in our case all feeders running in same enclosures are downstream of second level devices.

Yes, barriers are required in accordance with 300.3(C)(1)(a).

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CHAPTER 4: Equipment for General Use (Code Section 400.1 to 490.74)

Section 408.20 – (4/13/2017)

I am currently designing the electrical service for a new 4-story medical office building. The electrical switchgear room is located on the ground floor, in a flood plain area. The electric service room is being designed to be water-tight, with ship's doors. Must the electrical equipment (end service box, service switches, current transformers, meters, switchgear, transformers, panels) be installed at a level above the flood plain? If so, how high above the flood plain?

The building is new construction and will include an outpatient surgical suite, an imaging suite, a primary care suite and several medical offices.

No. Per Building Code, Appendix G304.1.2, Item 2.3, nonresidential buildings are permitted to have utilities located below the design flood elevation (DFE) with dry-flood-proofed enclosures with the exception to equipment listed in G304.1.1, Items 5.1 thru 5.4.

Please note that the use of ship’s doors may not allow access to the main service room where flood water hasn’t receded. In addition, such door shall comply with egress and be provided with panic hardware.

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Sections 450, 240, 250 – (6/8/2017)

A 480v to 208/120v 45kva step down transformer is installed in an electric closet. The line side is fed with #4 THHN fused at 70 amps. The load side of the transformer has 3/0 THHN conductors. These conductors enter a trough and are then tapped with 2 sets of #6 conductors; each set goes to the line side of a 60 amp main breaker of a branch circuit panel. The total length of the conductors, including the smaller tapped conductors, from the load side of the transformer to the line side of the main breaker of the branch circuit panel is less than 10'.

  1. Does this conform with the feeder and transformer sections of the code?
  2. If so can the ground conductor from the transformer to each panel main be sized for the main breaker of the branch circuit panel?
  1. The described feeder tap is actually a feeder double taps and is not considered to be protected.
  2. No. the equipment supply side bonding jumper shall be sized based on the derived phase conductor and not the OCPD in the panels. See subsection 250.30(A)(1).

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Sections 450.10 & 250.30 – (6/8/2017)

Does a transformer (480 to 120) require a direct ground?
If yes...What would suffice as a direct ground (e.g. water pipe (what type))?
Can you cite where I can find it?

Separately Derived System such as transformer shall be grounded in accordance with section 250.30, the acceptable grounding electrode is listed in subsection 250.30(A)(7).

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Sections 408.60(C) & 314.30 - (12/7/2017)

Is it required for handhold boxes (and junction boxes) to be labeled "Warning 480/277 Volts" per section 408.6? We believe that section 408.6 only applies to switchboards, panelboards and panelboard back boxes. Not handholes or junction boxes. Please confirm.

We see that section 314.30 requires handhole boxes to be labeled to describe the function of the enclosure such as "electric". Please confirm this is sufficient for junction boxes and handhole boxes. If not, please provide code reference for any other requirement.

NYC EC subsection 408.60(C) is applicable to backboxes of panelboards. Section 314.30 requires that handhole enclosure covers to have an identifying mark or logo to describe the function of the enclosure NYC Building Code requires an alternate permanently identifies the function of the enclosure. Voltage warning label for less than 600 volts are not.

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CHAPTER 5: Special Occupancies (Code Section 500.1 to 590.7)

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CHAPTER 6: Special Equipment (Code Section 600.1 to 695.14)

Section 680.26 – (4/13/2017)

The renovation did not include structural renovation of the pool shell wall itself.

Background:
The building and the pool were constructed following 1968 codes.
The renovation of the pool mainly replaced the concrete deck along with pool ladders, lifts, diving board and also provided for the replacement of the pool pumps, and other ancillary equipment along with the associated electrical supply equipment. The new electrical was design following 2011 NEC with NYC amendments, article 680. The new equipotential grid was designed in accordance to the section 680.26 and all metal parts and fitting were to be bonded to it. Since the pool shell walls were not renovated, except for providing new metallic covers to the existing ports and instal ling new finishes to the pool wall, connection of the ports to equipotential grid were not observed to be present.
It could not be established if the existing ports were ever bonded to the original grid. What is clear now, is that these existing ports in question are not connected to the new grid. The ports in question consist of an approximate 5"-6" deep embed metal base connected to PVC piping (see pictures #1 to #4 for reference). On top of this is a new metal cover that is approximately 1" deep and connects to the fitting base.

All of the piping in and around the pool, the pool coping, and all other metal parts have been bonded to the grid, and since there is a remote possibility that these ports can be touched simultaneously with other metal parts, as to whether these ports need to be connected to the grid. We are requesting a determination from the board on this matter. Do these Ports require Bonding to the new Equipotential Bonding Grid or Can Plastic Protective covers be installed over the existing metal covers? See attached Letter and Pictures for reference.

Yes, bonding is required for metal parts, see subsection 680.26(B)(5).
No, bonding is not required when plastic covers are installed over the ports.

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Section 695 & 430 (4/13/2017)

When tapping the fire pump circuit conductor before the fire pump controller to connect the jockey pump;

  1. Does the connection (tap conductor) of jockey pump to be based on the jockey pump’s FLC plus 25% since the tap is made to unprotected conductor? Or,
  2. Does the jockey pump connection follow the tap rules?
  1. No. Direct connected Fire Pump and Jockey Pump to be treated as service switches and shall be rated for the available short circuit.
  2. Yes, please refer to section 430.28, feeder taps.

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Section 695.4 – (4/13/2017)

For question below an onsite diesel generator is provided and a “listed combination fire pump and power transfer switch” is rated above short circuit availability is provided.

2. For a NYC “campus-style” distribution at MV (4160V), can one tap from a separate 20" section ahead of the secondary 480V main switch for the commercial building and proceed unprotected in 2" Concrete Encasement as per NYC 2011 Electrical Code Section 695.4 (A) Exception 1

Yes.

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Section 695.6 – (6/8/2017)

We are designing for a special service fire pump larger than 30HP in size and in accordance with Appendix Q of the New York City Building Code. We are providing power from the street side with a dedicated remote service switch in the electric service room.

  1. Does the feeder from the basement electric service room up to the roof special service fire pump have to be fire rated?
  2. Can the electrical requirements for this pump be provided in the same manner currently permitted in the New York City amendments to the 2008 NEC for "Limited Service Fire Pump"?
  3. Will the Installation of Lifeline RHW-2 or RW90 one-hour vertical fire resistive cables in EMT conduit, satisfy NYCEC subsection 695.6(B)(2)?
  1. Yes. This pump does not meet the definition of Special Service Fire Pump.
  2. No. Wiring of Fire Pump Circuit Conductors shall be in accordance with section 695.6(B).
  3. No. 2-hours fire resistance rating is required.

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Section 604.1 – (10/12/2017)

  1. Does Article 604 allow for pre-wired wall boxes with duplex receptacles with a modular connector?
  2. Does Article 604 allow a modular whip or box to be connected to base building electrical?
  3. Does Article 604 only pertain to lighting?
  1. No. See NYC Amendments, subsection 604.1(A)(3).
  2. No. See answer above.
  3. Yes. See answer above.

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Sections 695 & 700 – (10/12/2017)

  1. Can the control wiring for the ATS switch be in the same conduit with the standby feeder for elevators?
  2. Does the control wiring for the ATS switch for the FA Panel have to be in rigid conduit?
  3. Does the emergency power circuit wiring for the FA panel have to be in rigid conduit?
  4. Does the control wiring for the ATS switch for the Fire Pump have to be in rigid conduit?
    4a. Does this wiring have to be 2 hr fire-rated?
  5. Does the feeder from the generator for heat trace wiring that protects sprinkler pipes from freezing fall under Article 700?
  6. Does Branch circuit wiring for emergency loads have to be run in sprinkled spaces.
  1. Yes.
  2. No, only in mechanical spaces in accordance with 760.131.
  3. No. see answer to No. 2 unless installation is required to be installed in accordance with section 700.9(D) and NFPA 72, circuit pathway survivability.
  4. See answers to No. 2 and 3.
    4a. See answer to No. 4
  5. Yes. Described system is considered life safety load.
  6. 6. No.

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Section 695.5(A) - (12/7/2017)

Section 695.(A) of the NYCEC (2011) allows the use of a step-up transformer ahead of the fire pump controller if the transformer is rated at, “…a minimum of 125% of the sum of the fire pump motor(s) and pressure maintenance pump(s) motor loads, and 100% of the remaining load supplied by the transformer”.

My questions are:

  1. The wording of Section 695(A) implies that multiple fire pumps can be fed from a single transformer. Is my understanding of this code section correct?
  2. Please refer to attached sketch which shows a proposed arrangement using a single fused disconnect switch and step-up transformer to feed multiple fire pumps. Is this a NYCEC (2011) code compliant arrangement?
  1. Yes.
  2. Yes, when installation is in accordance with 695.5(A).

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CHAPTER 7: Special Conditions (Code Section 700.1 to 770.182)

Section 760 – (4/13/2017)

  1. In lieu of utilizing a 2-hour rated MI cable, is a 2-hour fire rated metal-clad cable similar to the attached UL FHIT System 120 suitable for Non-Power-Limited Fire Alarm (NPLFA) circuits?
  2. Please refer to ESK-001. Do the closets that contain data gathering panels (DGP's) serving multiple floors need to be 2-hour fire rated as outlined in NFPA 72-2010 Section 24.4.1.8.4.6 if the cable integrity system of the 2-way communication devices (warden phones) is maintained as two-hour (level 2 or 3 survivable).
  3. Please refer to ESK-002. If the answer to the question above is yes, do the closets need to be rated if there is a DGP located on every floor and each DGP serves only the fire alarm system devices on that same floor with a single evacuation signaling zone?
  4. Please refer to ESK-003. Section 24.3.5.7 of NFPA 72-2010 requires a level 2 or level 3 pathway survivability for two-way in-building wired communication systems (fire warden phones). NFPA 72-2010 Section 10.5.10.3.1.3 requires the secondary power supply circuits to have an equal survivability required by other sections of the code. Does this mean that the entire fire alarm system riser from the generator feed to the last fuse cutout panel needs to be a level 2 or 3 survivable via either a 2-hour fire rated enclosure or system?
  5. Can the battery backup provided within each fire alarm system DGP be considered to provide an equivalent of a level 2 or 3 survivability considering that the fire alarm system will still be operational if the riser power is compromised.
  6. Are fire alarm circuits considered pathway survivability level 1 as defined in NFPA 72-2010 12.4.2 when installed above a ceiling in a fully sprinkled building (no sprinkler protection above ceiling)?

This question is a Building Code question and was addressed by the Fire Alarm Committee’s meeting dated March 2, 2017.

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Section 760.41(A) – (8/3/2017)

Please refer to attached sketch depicting a tap ahead of the main breaker of a panelboard fed from a transformer to provide power for a fire alarm sub-system such as a strobe panel via fuse cutout switch.

  1. Does the tap rule requirements of article 240.21 forbid this connection as a tap conductor is not permitted to supply a tap conductor?
  2. Or are the requirements of 760.41(A) more prevalent, requiring the power to be derived head of the disconnecting means?
  3. If yes to question #1 above, is it permissible to provide an additional tap of a single phase of the transformer secondary windings to provide power to the fire alarm sub-system?
  1. Yes.
  2. No. Section 760.41(A) permits connection of local Fire Alarm panel or alternative fire protection system ahead of the main OCPD of the protected area’s panel. Your proposed installation violates section 240.4(E) and (F).
  3. Yes, a secondary set of transformer secondary conductors is permitted to be installed for the Fire Alarm.

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Sections 700.12 and 760.41 – (10/12/2017)

An existing building is classified as an A Occupancy with over 1,000 occupants and the building is 40'-0" in height. The new fire alarm system for the building will have an emergency voice communication system for live voice messages. There is (1) elevator that will not be used as an accessible means of egress. Chapter 27 of the NYC Building Code references NFPA 110 (Standard for Emergency and Standby Power Systems) and NFPA 111 (Standard on Stored Electrical Energy Emergency and Standby Power Systems). Chapter 27 does not state the type of emergency power system (battery or generator) to be used for required emergency or standby systems.

Section 700-12 (A) and 700-12 (C) states that storage batteries and uninterruptible power supplies may be used for emergency lighting and may be used for other systems where Special Permission is granted. There is a Fine Print Note under 700-12(A) that states to refer to Article 760 for use of batteries for fire alarm system.

Article 760-41 discusses secondary power sources for the fire alarm system. If a generator is installed in the building we must use the generator system as the secondary source in addition to batteries for the fire alarm system. We interpret that if a generator system is not required for the building to power other emergency or standby systems, batteries can be used as the sole source for secondary power for the fire alarm system.

Is Special Permission required to use batteries or an uninterruptible power supply as the secondary source for a fire alarm system when a generator system is not required to serve other emergency and standby systems?

Is a generator required to be installed to serve the fire alarm system even though no other emergency and standby power systems are installed?

NYC Building Code requires an alternate power source with 6 hours of on-premises fuel supply for occupancies other than R-2. The utilization of UPS as an alternate power system is permitted with a special permission only in accordance with 7700.12(C).

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Section 760.41 – (10/12/2017)

We are replacing an existing fire alarm system at Queens Borough Hall and the existing fire alarm system is not currently connected to the emergency generator.
The existing ATS switches serving emergency loads are not separated from the main incoming electric service.
We are planning on adding a dedicated fire alarm ats switch in its own 2 hr. rated closet within the overall electric room to satisfy 2014 NYC CH. 27 2702.1.7.2. We are not doing any other emergency power work in the building besides adding fused disconnects at main service, generator and fire alarm ATS.

Is it acceptable to provide a separate 2 hr. rated closet for our new fire alarm ats switch in the main electric room and leave existing ATS switches as they currently are in the same room as main electric service?

Fire Alarm Service taps are usually exempt from Advisory Board approval. We will be tapping the line side of a 2000A breaker at the generator and main service to feed a 60A Fire alarm ATS which we are proposing to put in a 2 hr rated closet inside an electric room with over 1000kva of switchgear.
Would an advisory board submittal be required for this type of fire alarm service tap?

New emergency and Legally Required Standby systems installation shall comply with the current applicable codes. Existing systems that were installed under prior codes, permitted, and inspected before September 9th, 1998, shall be permitted to remain, see repealed 1RCNY 12-01.
Fire Alarm taps are not required to be filed with the NYC Electrical Advisory Board, see Amendments subsection 110.2(B), Exception No. 1.

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CHAPTER 8: Communications Systems (Code Section 800.1 to 830.179)    

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CHAPTER 9: Tables (Table 1 to 12(B))

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ARTICLES

Article 408 - (2/2/2017)

During our replacement for the interiors of residential apartments’ panel, we notice that the old panel’s back boxes were installed with a setback of about ½” from the surrounding non-combustible surfaces. Is the requirement of sections 314.20 and subsection 406.4(A) applicable to Article 408? Would the installation be grandfathered and allowed to remain since it is considered a fix?

Section 312.3 allowed a maximum setback of ¼” from non-combustible surfaces. Electrical installations shall comply with current electrical code in accordance with administrative section 27-3024.a.

You may apply to the NYC Electrical Advisory Board for variances.

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Article 215 – (4/13/2017)

We are currently the building engineers for a COOP building. The building was built in 1925 and has 52 apartment units and 3 doctors' offices on 16 floors. Routing of feeders for COOP unit electrical upgrades is difficult. The existing path of electric feeders is not traceable and the conduit is too small to accommodate a 100 Amp feeder. A number of units are planning upgrades. Provided the stair egress clearance width requirement is not impacted, can COOP unit new electrical feeders run in the stair by one of the following methods:

  1. If exposed with EMT conduit and wiring?
  2. If the feeder is a 2 hour rated MI cable?
  3. If the feeder is a 2 hour rated MC cable?
  4. If the feeder is installed with EMT conduit and wire enclosed in a 2 hour rated construction?

No for A thru D. Proposed penetrations through an exit enclosure are prohibited in accordance with 2014 NYC BC 1022.4, 2008 NYC BC 1019.1.2, and 1968 NYC BC 27-375(j). You may ask for variance with a submittal to the Borough Office.

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Article 100 - (12/7/2017)

Per 2011 NYC Electrical Code technical provisions, Article 100, defines an Electrical Closet as "a room designed for or dedicated to the purpose of containing electrical distribution equipment such as vertical risers, bus ducts, transformers or panelboards."

For 'E' Educational Occupancy building, a room labeled as Storage Room, located in the cellar currently contains only an automatic transfer switch, would that room be defined as an Electrical Closet?

Yes.

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Article 330 - (12/7/2017)

1) Do the current NYC amendments to the NEC allow the use of PVC jacketed MC Cable(see attached) and listed concrete connectors to be installed in concrete while it is being  poured?
1A) If yes: Can we use the above mentioned materials to supply power between an outlet closest to the patio area INSIDE the apartment and a pedestal that houses a GFCI receptacle outside?
1B) If yes: Can we use the above mentioned material to supply to floor outlets inside the apartments (floors to be 6" concrete)?

1) Yes.
1A) Yes.
1B) Yes.

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Article 358 - (12/7/2017)

Article 760.52 permits the use of EMT conduit for NPLFA circuits when installed in garages, loading docks, mechanical rooms and elevator rooms over 8’-0” AFF, and without any height limitations in mechanical rooms and elevator rooms less than 900 square feet in area.

1. Since Article 358 (EMT) conduit is approved for NPLFA circuit wiring in mechanical rooms less than 900 square feet in area, can Article 358 be applied when NPLFA circuits are concealed in mechanical shafts less than 900 square feet in area?

Yes, as long it is not subject to physical damage and the shaft is dry location.
Please note that EMT is not permitted in loading docks that are open to the weather element.

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Article 695 - (12/7/2017)

We have been approached to install both a normal and emergency feeder for a 40hp rooftop fire pump in a 325' tall commercial office building. The normal feed will be routed horizontally through the building from the Fire Pump Service Switch with a UL listed 2hr rated system consisting of RHW-2 and matched EMT per UL System No. 25A. It will exit the building and enter a pullbox on exterior of the building where it will be spliced per RHW-2 manufacturer specs to THWN-2. We would then run vertically up on the building exterior with THWN-2 in Rigid Galvanized Steel to the rooftop. The Emergency Feed will run from the outdoor generator Fire Pump Service Switch vertically to the roof.
Question Does this general installation conform with the requirements of Fire Pump Feeders per NYC Code?

Yes, where the exterior installation is 30 feet away from all adjacent structures and the conductors are being supported in accordance with NYC EC.

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ADMINISTRATIVE: General Requirements

Section General – Building Code, 2702.1 - (4/13/2017)

I have a few interpretation questions for the NYC BC – Chapter 27 – Electrical. Primarily 2702.1 – Installation. We are looking into specifying an optional standby system (generator) for a single-family residential; however, we’re coming across generators that are not listed to NFPA 110 standard.

  1. Do optional standby systems (per NEC Article 702) for a single-family residential require to comply or be listed for NFPA 110?
  2. If not, is there an amendment/local law stating this?

This is a Building Code question. Answer provided here is to provide guidance only.

  1. No.
  2. Chapter 27 of NYC Building Code does not mandate any required emergency or standby power system for such occupancy, also, BC section 2702.4 is not applicable either, hence the optional standby generator is not required to comply with NFPA 110 or to be UL 2200 listed.

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Section General – Administrative Code, 27-3017 – (4/13/2017)

This question is in regards to temporary wiring for commercial spaces.

In hotel meeting room spaces, is it permitted for individuals other than licensed electricians to install temporary power wiring for projectors and other AV equipment for meetings and events?

No. See administrative section 27-3017.

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Section General – Building Code, 2702.1.7.1 - (10/12/2017)

NYC electrical code
Section 230.64(B)(1)
-Service Rooms or Areas

We respectfully request a code interpretation regarding the 2-hour fire barriers Code requirements for Standby Power Systems Electrical components, equipment and systems.

We work on new mixed use High-rise complex for NYU that will consist of occupancies groups R-2, B, A-1, A-2, A-3, totaling 800,000SF.

Two (2) primary electric service points are obtained from NYU’s cogeneration plant and consist of two indoor unit substations
4160 volt –480/277 volts, 4000Amps in accordance with NYU’s campus standards.

Two (2) secondary service points are obtained from Con Ed Low Tension (LTV) sidewalk vault and consist of two
4000Amps 480/277 volts take-offs servicing two Main Switchgears.
Two (2) Automatic transfer switches 4000Amp each are provided between each of 4000 amp switchboard and cogeneration substations.

2014 NYC Building Code Chapter 27, Section 2702.1.7.1 – Mandates for automatic transfer switches serving “REQUIRED EMERGENCY POWER EQUIPMENT” to be located in a separate room than that of the normal service equipment.
Both of Cogen unit substation and Con Edison service are not classified as “EMERGENCY POWER EQUIPMENT”.

  1. Would Cogen unit substation or Con Edison service be classified as “EMERGENCY POWER EQUIPMENT”?
  2. bIs it acceptable to locate the automatic transfer switches associated with this system within the same room as the normal service equipment considering transferring all load to alternate service?
  3. Is it acceptable to locate ATS, serving Life Safety load located within the same room as the normal service equipment?
  1. No. Refer to Building Code, Chapter 27, and NYC Electrical Code for recognized emergency power sources.
  2. Yes, if all loads are Optional Standby loads.
  3. No.

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Section General – Building Code, Chapter 27 - (10/12/2017)

Project includes NYC NEC 700 compliant battery operated means of egress emergency illumination as required by NYC BC 1006. Emergency lighting is integral battery operated LED drivers with charging/sensing circuit connected ahead of local normal power switching. NYC NEC 702 compliant optional standby power generator is provided.

Buildings Bulletin 2015-002 Clarifies 2702.4 requiring that emergency lighting be connected to an optional standby power system if provided. Bulletin 2015-002, Specifics: "B" requires optional standby power systems to power emergency lighting unless such loads are "already supplied by a functioning emergency power system". See excerpt below:

(B) Where an optional standby power system is installed in a new building or an existing building, it is required to supply any of the required loads listed under section BC 2702.4.  Such loads shall be connected in accordance with Articles 700 and 701 of the 2011 New York City Electrical Code and shall include the following as applicable, unless such loads are already supplied by a functioning emergency power system or legally required standby power system:
(a) Emergency Lighting....

  1. Is the battery backup lighting considered a "functioning emergency power system" as stated in Bulletin 2015-002, Specifics: B?
  2. If response to question 1 is "No", can the lighting circuits that are connected to NYC NEC 700 battery operated emergency lights be connected directly to the optional standby power branch?
  1. Yes.
  2. N/A.

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Section General – Building Code C 2702.1.7.1 - (12/7/2017)

We respectfully request a code interpretation regarding the location of automatic transfer switch serving the same system supplied by a Cogen generation plant as an alternate source of power supply. 2014 NYC Building Code Chapter 27, Section 2702.1.7.1 – Mandates for automatic transfer switches to be located in a separate room than that of the normal service equipment.

Is it acceptable to locate the automatic transfer associated with this Cogen generation system within the same room as the normal service equipment?

Yes, if the Cogen is serving optional loads.

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Copies of the NYC 2011 Electrical Code (only the amendments to the NEC 2008 Electrical Code) and the New York City Electrical Code (the amendments and the NEC 2008 Electrical Code) can be purchased at the CityStore.

Other Code Interpretation Links: