2015 Code Revision and Interpretation Committee Code Interpretation (Last Updated: April 20, 2017)
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.
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.
Click a topic, or press the enter key on a topic, to reveal its answer.
Chapter 1: General (Section 110.1 to 110.79)
Section General - BC 2702.2.20- (2/4/2015)
- Please review the following, as per 2008 NYC Building Code, Chapter 27, Section-2702.2.20, Paragraph 3. A Hotel (Non-High Rise Bldg.) 60'-0" in height, does this Bldg. requires an Emergency Generator?
This question is a building code question and should be forwarded to email@example.com. We will provide the following answer for guidance only.
- A Hotel (High or Non High Rise Bldg.), does this Bldg. considered to be a Commercial Bldg.?
Yes. The term "Commercial Building" is not a NYC Building Code defined term.
- Aside of a Residential Bldgs., all buildings above 75'-0" in height, are considered to be High Rise structures?
Yes, refer to high-rise definition the NYC Building Code.
Section General – BC 2702.1.7 - (4/1/2015)
- We respectfully request a code interpretation regarding the location of a new automatic transfer switch to serve existing emergency panelboards serving emergency lighting and fuel oil system pumps for a life safety generator. The building was designed under the 1968 Code. The existing emergency panelboards are located in the building basement level service switchgear room which contains utility service switchboards and distribution switchboards. The switchgear room is not sprinklered.
- Is it acceptable to install the new automatic transfer switch in the room housing the existing main electrical service equipment and existing emergency panelboards?
- If the answer to 1 is 'No', is it acceptable to leave the existing emergency panelboards being served by the ATS in the service switchgear room?
Yes, if it was installed before 1986.
Section General – BC 2702.1.7.1 - (6/30/2015)
- We respectfully request a code interpretation regarding the location of automatic transfer switch serving an optional standby system supplied by a natural gas fired generator within an R-3 occupancy residence. 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. Section 2702.2 does not require an R-3 occupancy residence to be equipped with an Emergency or Standby power system. This residence does not have any required emergency power equipment and it does not fall within any of the criteria as described within Section 2702.2.1 thru 2702.2.20.2. Is it acceptable to locate the automatic transfer associated with this optional standby system within the same room as the normal service equipment?
Yes, where there is no required emergency or Standby loads, ATSs that serve optional standby are allowed to share the main service room with service equipment.
Section General – Old Interpretations - (4/1/2015)
- Will code interpretations within the "technical provisions" from time periods during prior NYC electrical codes be considered still in effect for future codes if the particular noted code sections remain unchanged?
- Will code interpretations within the "administrative provisions" from time periods during prior NYC electrical codes be considered still in effect for future codes if the particular noted code sections remain unchanged? Our question is, is the desktop cord and plug connected monument approved for use in New York City?
Section General – Continuing Education - (4/1/2015)
- Has the continuing education requirements been developed yet? If they have been completed when will the continuing education requirements be enforced? Are there any approved providers yet?
Yes, see curriculum.
See the current approved providers list.
Section 110.2 - (2/4/2015)
- Do PV inverters that are on the NYS Department of Public Service "Certified Interconnection Equipment list", that are UL Listed and Identified, and UL 1741 compliant approved for installation in NYC?
Listed material is acceptable to be used in NYC when installed using the applicable permits and inspection.
- Do we need NYC Advisory Board approval for PV equipment that already is NYS Department of Public Service "Certified Interconnection Equipment list", UL Listed and Identified, and UL 1741 compliant?
No, unless such material is over 600V or installation, or is subject to section 110.2.
- Is there a published list of "NYC Approved" PV equipment? (a) or (b) above?
Section 110.2(A) - (12/2/2015)
- We have a hotel application where a UL listed 24VDC controller is provided for each guest room. The controller provides output power and control to 24VDC lighting, shades, and door hardware. Control of lighting and shades is either by a network connection or by means of momentary 24VDC switches rated for 24VDC, which are connected to the controller. Note that all wiring is Class 2 and the lighting fixtures are UL listed.
- Do the shade motors have to be NRTL listed?
- Do the momentary switches have to be NRTL listed?
- Does the door hardware have to be NRTL listed?
Yes, if it contains electrical component..
Section 110.25 - (10/7/2015)
- Could the continuous, uninterrupted metallic conduits containing telephone cables pass through electrical closets? There would be no telephone or communications equipment within the electrical closet.
Yes, where such communication conduit is installed in accordance with subsection 110.26(F).
Subsection 110.26 - (8/5/2015)
- Article 110.26(F)(1)(a) of the NYC electrical code contains a requirement for a six-foot dedicated space above panelboards. Would this requirement also apply to panelboards that are recessed into a wall where the access to the space above the panelboard is not generally not accessible? An example of such condition might be a panelboard in a dwelling unit.
Requirement of subsection 110.26(F)(1)(a) applies to equipment listed in the subsection, including panelboards located in dwelling units.
Chapter 2: Wiring and Protection (Code Section 200.1 to 285.28)
Section 210.12 - (2/4/2015)
- Question we have small laundry closets within residential dwelling units. Is an AFCI needed for (120 volt) washer and dryer branch circuits?
Yes, AFCI is required for all closets by NYC Electrical Code section 210.12.
Section 210.12 - (10/7/2015)
- Are we required to install AFCI for:
- bedroom lighting circuit?
- carbon/monoxide smoke detectors?
Carbon/ Monoxide smoke detector units shall not be connected to AFCI/ or GFCI protected circuit. Carbon/ Monoxide smoke alarm units that are connected to new branch circuit shall be protected by AFCI. For existing dwelling units; it shall be permitted to connect to existing branch circuits without AFCI protection.
- p-tack units( in-wall mounted air conditioner units)?
Yes, if they are served by 15 or 20 ampere OCPD and at 120V.
Section 210.52(F) - (8/5/2015)
- For a multifamily building, a 4'x4' closet with 3' door is provided in each residential unit for stacked washer and dryer, one dedicated receptacle is provided for each of the washer and dryer , each receptacle is connected to separate dedicated circuit.
Does the code require another 20A receptacle in the closet per 210-52-F, in addition to the two receptacles provided for the washer and dryer?
Section Subsection 210.52(I) - (4/1/2015)
- Section 210.52(I) of the electrical code requires the installation of a receptacles for air conditions in certain rooms, unless the building is equipped with a central air conditioning system. Our request for interpretation is to determine whether this requirement is applicable to existing buildings where an alteration may be made to subdivide rooms. Specifically, in an existing high-rise building a room will be subdivided into two (2) rooms, but where an installation of window type air conditioning units is not possible due to particular type of windows preventing installation of any equipment at the window. In addition, the existing building distribution system was not designed to accommodate additional air conditioning units beyond presently installed heat pumps or packaged air conditioning units through the building façade.
Since you are creating new bedrooms, they must comply with the current NYC Electrical Code. A/C receptacles must be provided unless other air conditioning systems are provided which don't require such receptacle.
Section 210.8(A)(5) - (6/30/2015)
- From Article 210 Section 210.8(A)(5):
Unfinished basements - for the purposes of this section, unfinished basements are defined as portions or areas of the basement not intended as habitable rooms and limited to storage areas, work areas, and the like... My question, who determines the habitability of areas of the basement? Is it the homeowner when she/he installs sheetrock ceilings and walls or is it the architect when he/she files a plan with NYC Buildings and it is, subsequently, approved? Habitability determines the need for GFCIs in that or those areas.
Habitability is determined by the Certificate of Occupancy and the construction document as filed and approved by the Department of Buildings.
Section 210.12 - (6/30/2015)
- We are adding one receptacle in a bedroom. The existing circuit that we will tapping off is not AFCI protected. Are we required to have AFCI protection for the entire circuit?
Habitability is determined by the Certificate of Occupancy and the construction document as filed and approved by the Department of Buildings.
Section 210.60 - (4/1/2015)
- We are currently working on a school dormitory classified as a dormitory as per NYC zoning resolution. We have prior advisory board approval to install work as per section 210.60. Please clarify if Tamper-Resistant Receptacles are required for the above mentioned application.
Section 215.2 - (4/1/2015)
- A project involves a provision of one new (1) 4000A, 120/208V service switchboard located within the building 200 feet away from Con Edison property line splice box. Con Edison service capacity is limited to 1600A,120/208V. This project will be designed in compliance with ASHRAE 90.1-2010 for energy conservation compliance. This energy code requires 2% maximum VD for feeders. In addition, as per the Interpretation IC 90.1-2007-23 of ASHRAE Standard 90.1-2007, voltage drop calculations should commence from service equipment. Considering that Exception No. 4 of NYCEC Section 215.2 1 calls for applicable Energy Conservation Code for voltage drop (VD) requirements, will it be acceptable to size feeders as follows: One or less percent of VD between Con Edison property line splice box and service switchboard calculated based on 1600A service capacity and two or less percent of VD for the feeders from the service switchboard based on calculated loads in compliance with NYCEC?
For the purpose of the electrical code, the above is acceptable. For energy code when applying ASHRAE 90.1, you must direct your question to the department, firstname.lastname@example.org
Section 220.55 - (2/4/2015)
- Would it be acceptable to use Table 220.55 for demand factors for household electric cooking appliances for electric steam shower generator loads. The New York City Electrical Code does not address the issue of demand for this load as it relates to feeder to apartment panels and feeders serving multiple apartment distribution panels. We believe the use of Table 220.55 should be an acceptable means for establishing the demand for this load. These electric steam generators would more than likely not be used as much as the electric cooking appliances so we believe it would be a good method for establishing a demand for this load. This request is for the risers/distribution only. The load per apartment will be calculated per electrical code [other tables]. The project has 94 apartments, 18 of which have these electric steam generators. They are sized at 12 KW and 15 KW depending on the size of the showers they serve?
No. Either standard method and section 220.53, or optional method applying section 220.84 shall be used.
Section 220.84 - (4/1/2015)
- Article 220.84 allows optional feeder and service calculations to be done for apartment feeders subject to three conditions:
- No dwelling unit is fed by more than one feeder.
- Each dwelling unit is equipped with electric cooking.
- Each dwelling unit is equipped with either electric space heating or air conditioning.
- We have a central chiller plant in the building and each apartment is provided with local fan coil units.
- Are these fan coil units considered air conditioning equipment?
No. See 440.3(B)
- Do these fan coil units satisfy the third requirement of article 200.84?
- YC Article 220.14 (M) Allows the loads for air conditioning units to be included with general lighting load and the associated demand factors can be applied.
- For projects with hardwired heat pumps in the apartments, can the heat pump loads be included under the general lighting loads?
- For projects with hardwired fan coil units in the apartments, can the fan coil loads be included under the general lighting loads?
Section 220.84 - (4/1/2015)
- A "Condo-Hotel", where each guest room has permanent provisions for electric cooking in addition to permanent provisions for sanitation, and sleeping; It also has Heat Pumps installed for each room. The building is in Occupancy Group R1 (Hotel). Each unit will have its branch circuits metered per Energy code requirements for Dwelling Unit. May table 220.84 Optional Calculations - Demand Factors for three or more Multifamily Dwelling Units, be applied to electric service and feeder calculations.
Section 220.84 - (6/30/2015)
- We are installing a mini 120V condensate pump at each HVAC fan coil unit above the suspended ceilings, located 8ft or higher above the finished floor, and accessible only to qualified personnel. The pump will be located on a shelf adjacent to the fan coil unit. The pump is not provided with a junction box for termination of the power wiring. MC power cable is routed to each pump location, and the pump housing has wiring termination points and a cover for the termination screws. The manufacturer's installation instructions direct the wires to be stripped 1/4" and inserted into the termination points labeled L-N-G. The screw cover is then inserted so that no terminals or bare wiring is exposed. Is the electrical installation as per the manufacturer's specifications for this application code permissible, or is a raceway or enclosure required between the MC cable and the pump wiring termination points?
No, equipment is not used per its intended listing and use.
Section 230.64 - (4/1/2015)
- As part of a NYCHA's Hurricane Sandy Resiliency program, we are replacing and elevating existing electrical service and distribution equipment in the main electrical rooms to mutli-family housing buildings that were constructed during the late 1950's. We are also installing natural gas generators at each building to backup 100% of the building electrical loads. Some of the building's main electrical service room share space with existing gas service and gas meter. In some buildings we plan on installing new elevated electrical rooms that are located on site and remote from the residential building. New electrical service will be installed to the new elevated electrical room. New feeders and branch circuits will be routed from this new elevated electrical room into the existing main electrical service room to splice into existing feeders. Proper switching instructions will be provided in the existing and new main electrical service room. In some buildings the existing electrical service and distribution equipment will remain (but will be re-fed from new feeders from the new emergency/standby distribution system) in the existing main electrical rooms that share space with the existing gas service and gas meter.
- Is it acceptable to splice new feeders and branch circuits to existing feeders and branch circuits in the existing electrical room that share space with the existing gas service.
- Is it acceptable to leave the existing electrical equipment in the existing main electrical room that share space with the existing gas service and gas meter?
Yes, when the gas service in not a high pressure gas service. The required clearance must be verified with the utility company
Section Subsection 230.64(B)(1) - (4/1/2015)
- May minimum 5 ft of clearance be allowed for service switches in a one line switchboard facing a stand-alone service switch where service equipment is 1000KVA or more?
No. 7 feet is required.
- May minimum 5 ft of clearance be allowed for two (2) stand-alone service switches facing each other where service equipment is 1000KVA or more?
Section 230.71 - (12/2/2015)
- A new building currently under design is intended to not have a service connection to the local electric utility service. Instead, all normal power demand within the building will be supported by power generated by cogeneration engines. The building is expected to have approximately twenty 100kW rated cogeneration engines operating at 480/277V. These engines will operate in parallel with each other and output power to the building's main low votlage switchgear. A local disconnect will be provided on the electrical output of each cogeneration engine.
- Question (1): Is the electrical output of a single cogeneration engine considered a Service as per Article 100 and therefore the local disconnect switch at each cogeneration engine would be classified as the local Service Disconnecting Means as shown in attached Example Diagram 1?
- If the answer to Question (1) is 'Yes', then, the quantity of Services within the building will be twenty. Do these Service Disconnecting means need to be grouped in quantities of six or fewer as per 230.71 as shown in Example Diagram 2?
- If the answer to Question (1) is 'No', then is the combined output of a group of cogeneration engines considered a Service as per Article 100 and therefore this output requires a local Service Disconnecting Means as shown in attached Example Diagram 3?
N/A. Note that disconnection mean(s) may be required under other Articles, or for the purpose of isolating co-gen.
Section 240.24 - (2/4/2015)
- We are designing a 19 story high rise, mixed use (residential, hotel and retail) building. It has been requested by ownership that the refrigerator receptacle and (1) convenience receptacle in each residential apartment be supplied with a dedicated emergency circuit (one circuit for both receptacles). Our current design includes emergency standby panels on floors 8, 11, 14 and 18, dedicated to supplying power to the designated emergency receptacles in each apartment. These panels are located exterior to the apartments, in electrical closets on the associated floors. These panels are normally fed by utility power and backed up by on site emergency generator via a designated automatic transfer switch. Section 240.24 of NEC 2008 states that "Each occupant shall have ready access to all overcurrent devices protecting the conductors supplying that occupancy unless otherwise permitted in 240.24(B)(1)". Section 240.24(B)(1) also states that "where electric service and electrical maintenance are provided by the building management and where these are under continuous building management supervision, the service overcurrent devices and feeder overcurrent devices supplying more than one occupancy shall be permitted to be accessible only to authorized management personnel in the following: multiple-occupancy buildings, guest rooms or guest suites". In this case, the building in question will have a 24 hour super to provide maintenance to the standby panels serving emergency receptacles within apartments. It is our interpretation that since this is a multiple-occupancy building, and that there is continuous building management supervision, that our design would be allowed by code. Would you agree with our interpretation of NEC 2011 in regards to our current design?
No, the code section sited refers to service and feeders not branch circuits.
Section 240.32 - (4/1/2015)
- Medium voltage switchgear is designed and built to ANSI standard C37.20.2. The NEC has no governance over the design of medium voltage switchgear; NEC governance applies to the cable/wire/bus entering and exiting the switchgear but not to the switchgear itself. It is required that equipment installed in NYC be NRTL listed. In the cases where UL listed medium voltage switchgear is provided, the UL listed assembly for medium voltage switchgear requires that medium voltage switchgear temperature rise of the bus and connections be tested per ANSI standards and documented by design tests. Will UL listed medium voltage switchgear with documented temperature rise design testing of bus and connections at the applied continuous current ratings be accepted understanding that section 230.42 of the NYC technical amendments to the 2011 NEC code does not apply to medium voltage switchgear?
Section 230.42 of NYC Electrical Code applies to service bus bars installed in service equipment of any voltage rating.
Section 250.1, 250.21, and 250.30 - (2/4/2015)
- The question is related to having more than one separately derived grounding system in the same building. Our client is building a highly specialized cancer treatment center. The equipment vendor requires a separately derived grounding system to provide a clean ground to do independent testing/measurement of their equipment. The equipment technicians will have no equipment permanently connected to the reference system. Is the proposed installation acceptable to install two separate grounding systems, one will be the required grounding electrode system, and one shall be for the equipment vendor technicians for their sole use of equipment calibration?
No. as per sections 250.1(A), 250.21(A), and 250.30 bonding between the two grounding electrode systems are required.
Section 250.52 - (8/5/2015)
- Existing 30 story concrete commercial building. A cold water riser is provided for the entire building. Electrical closets with panels and transformers are provided on each floor. Can ground wire for each electrical closet connect to the existing cold water riser as an acceptable method of grounding?
No. See interpretation of April 4th, 2012.
- Existing 30 story concrete commercial building. Continuous steel rebar is provided in columns. Electric closets with panels and transformers are provided on each floor. Can the ground wire for each electric closet connect to the existing steel rebar in the columns?
No. The rebars must be mechanically joined or bonded in order to provide an effective grounding and low impedance path to earth.
Chapter 3: Wiring Methods and Materials (Code Section 300.1 to 398-104)
Section 310.4 - (12/2/2015)
- We are in the process of designing an electrical system for a high rise building that will have multiple parallel risers for meterbanks. An example of 1 situation is where risers leave a 1200A switch as 3 sets of 600kcmil. These risers feed 2 meterbanks, 1 on the 6th floor and 1 on the 12th floor. Is it acceptable to use an lisco PBTD-9-500 Insulated Mechanical 2 Sided Tap, per phase in the riser box to distribute the tap and continue the riser? Does this satisfy the requirement of the code for parallel conductors? Please see the cut of the mechanical tap attached.
Yes, it does satisfy parallel conductors per section 310.4.
Section 320.30 & 330.30 - (6/30/2015)
- Can AFC's MC-Snap-IT, UL listed Positioning Device be used to secure and support Type Type AC and MC Cable in NYC where ever Type Type AC and MC Cable are permitted by the NYC Electrical Code( i.e. Hi rise structures above three stories enclosed in non-fire rated assemblies)?
Yes. MC-Snap-IT is acceptable for vertical support only when installed in accordance with its listing.
Section 324.10 - (12/2/2015)
- Please clarify if Type FCC cable is permitted for use in NYC for power conductors.
Yes, when listed and installed in accordance with its intended use.
Section 330.12 - (12/2/2015)
- As part of New York City Housing Authority's Hurricane Sandy Rehabilitation work, we are replacing and elevating existing electrical service and distribution equipment in the main electrical rooms to multi-family housing buildings that were constructed during the late 1950's. All building are high rises. In some buildings we plan on installing new elevated electrical rooms that are located on site and remote from the residential building. New electrical service will be installed to the new elevated electrical room. New feeders and branch circuits will be routed from this new elevated electrical room into the existing main electrical service room to splice into existing feeders. Feeders and branch circuits will be routed from the new remote electrical room to the existing residential building within the ceiling void of an elevated outdoor canopy that will physically link the new remote electrical room and the residential building. The canopy will be installed along an outdoor pedestrian walkway. Proper switching instructions will be provided in the existing and new main electrical service room. The feeders and branch will terminate in the main electrical, compactor rooms, and other non-residential spaces on on the ground floor which are located on an exterior wall in the residential buildings. For the new installation, MC cable will be used beyond these areas at the ground floor.
- Can MC cable with an outer jacket of PVC be installed above the canopy for feeder and branch circuits?
No, unless it is located within 3000 ft. of salt water body.
- Can MC cable (non-PVC coated outer jacket) be installed above the canopy?
No, unless it is located within 3000 ft. of salt water body.
- Can MC cable with an outer jacket of PVC be installed in the main electrical room, compactor areas, and non-residential spaces on the ground floor of the residential building and at the new elevated remote electrical room? The length of MC cable with PVC jacket will be limited to these areas and will not run within residential spaces.
No. Unless it installed in accordance with 330.12(5).
Section 335.10 - (4/1/2015)
- For telecom service providers we specify the use of fiberglass raceway for bonding conductors. The bonding conductor are typically used for equalizing equipment potential above and beyond the normal equipment grounding conductors, as well as for grounding electrode conductors for derived systems. The fiberglass raceway is specified to prevent "choking" the ground current (if and when it may occur). Is it a violation of the code to use the fiberglass raceway for this purpose?
Yes. It is a code violation to install such conduit exposed. You may request a special permission from EAB for the described installation above.
Section 362.10 - (2/4/2015)
- We have 2 pieces of kitchen appliances equipment (ovens). Both units have the wires whips with ground wire inside the plastic flexible conduit. These are ETL approved equipment. The owner does not want us to modify it as it will lose warranty and equipment listing.
If installing plug is within the manufacturer's recommendation then it will be acceptable to be installed in NYC.
- Can we install a plug to be connected to flexible cord?
- Would that be an approved method of wiring as per NYC electrical code?
Chapter 4: Equipment for General Use (Code Section 400.1 to 490.74)
Section Subsection 406.3(D)(1)- (4/1/2015)
- We are replacing kitchen cabinets in 182 apartments in a senior housing project. We are not opening any walls but are converting the existing counter receptacles to GFCI receptacles energized on existing circuitry and wiring in all kitchens. The other electrical work in the apartments is the direct replacement of federal pacific panels with new Siemans panels. Are we correct that we are not required to rewire the existing receptacles in the kitchen to current code standards?
Replacement of existing receptacles must comply with subsections 406.3(D)(1) thru (3). The described work scope doesn't trigger the rewiring of existing receptacles under NYC Electrical Code.
Section 408 - (8/5/2015)
- Can a 208volt 200amp circuit breaker panel with lighting loads (feeding hotel guest rooms) be extended to 84 circuits via a feed thru panel (two 42 circuit panels with section 1 having a 200-amp main breaker).
Yes. When the calculated demand doesn't exceed the main OCPD rating, and both panels are rated equal or larger than OCPD.
- if no, what section(s) of the code support the answer.
Section 410.10(D) - (8/5/2015)
- I would like to clarify 410.10(D) "Bathtub and Shower Areas", We constantly getting violations for light fixtures in bathrooms for not having Damp or Wet location approved light fixtures. "Even it's NOT directly over the outside dimensions of the bathtub or shower or above 8 ft of the bathtub or shower stall". I believe there is a confusion putting together the first part of the paragraph and the second part of the paragraph, meaning where it says which light fixtures are not approved to be installed 3 ft horizontally and 8 ft. vertically from the top of the bathtub... with the second part of the paragraph where it says "Luminairs located within the actual outside dimension ... and 8 ft vertically should be marked for Damp..." My question basically is: Are we requires to install Damp location lights in a Bathroom if its located outside the bathtub or shower area or above 8 ft directly above the bathtub or shower?
Yes. Refer to the definition of damp location in Article 100.
Section 410.10(D) - (12/2/2015)
- We have a shower recessed light listed as damp location, installed in the inside dimensions of the bathtub at 6' above the bathtub,
My question is about the rating of the light fixture,
- Does this fixture qualify since it is rated for damp location or is it required to be Wet location?
Yes, when listed for damp location.
- What is the definition of SUBJECT TO SHOWER SPRAY? Does it mean that if the shower will spray directly on the fixture or does it mean indirect (there is a slight chance when someone takes a shower it will splash the light fixture)
SUBJECT TO SHOWER SPRAY: Interpreted that it's likely to be in direct path of the spray from the shower head.
Section 465.10 - (12/2/2015)
- As a follow up to the Electrical Code Revision and Interpretation committee minutes of the October 7th, 2015 meeting question #1, if a power distribution unit (PDU) with built-in branch circuit panels is located within a data center feeding information technology equipment in the data center, would opening the main circuit breaker of the PDU via a shunt trip comply with Article 645.10?
Chapter 5: Special Occupancies (Code Section 500.1 to 590.7)
Section 517.30(C)(1) - (6/30/2015)
- A hospital proposing to use a double-ended substation as their emergency distribution, at each end of the sub-station they want to derive the Essential Electrical System (EES) branches. The consultant has a concern that it does not meet the code intent where the EES branches are derived. The question is, would the separation of the EES branches have start at the Emergency Power Source (EPS) or they can be derived downstream at the Emergency Power Supply System (EPSS).
Section 517.30(C)(1) does not require the wiring of the essential electrical system (EES) to be kept entirely independent of all other wiring at the emergency power source (EPS). The EPS is permitted to supply a distribution overcurrent arrangement (switchboard) that further distributes and provides power for the equipment, critical and life safety branches of the EES. Any combination of these systems are permitted to be supplied by a single feeder up to the demarcation point of the EES branches where the critical and life safety loads must then be kept entirely independent of all other wiring and equipment.
Section 517.30 (C)(3)(3) - (8/5/2015)
- Our firm has been contracted to provide design services for the separation of emergency power for an existing Hospital facility. As part of this design we will be required to show feeder routing for normal and emergency power, to limit cost and maintain the required minimum ceiling heights in corridors and non-patient areas (in kitchen, office, and storage areas) while snaking through between existing structural beams and duct work we would like recommend the use of flexible armored metal raceway. Flexible Metallic Raceway will meet one or more of the requirements of NEC section 250.118.
- As per NEC 517.30.(C)(3)(3), Is it permissible to install Listed Flexible Metal Raceway for Normal Feeders (rated 100-800Amps) in the renovation of an existing Hospital Facility (feeders will be rated between 100-800Amps)?
Yes. Subsection 517.30(C)(3)(3) is not relevant.
- As per NEC 517.30.(C)(3)(3), Is it permissible to install Listed Flexible Metal Raceway for Emergency Feeders (Life safety, Critical, and Equipment branches) in the renovation of an existing Hospital Facility (feeders will be rated between 100-800Amps)?
Yes, if installed in accordance with 517.30(C)(3)(3).
Chapter 6: Special Equipment (Code Section 600.1 to 695.14)
Section 645.10 - (10/7/2015)
- We are in the process of designing the power distribution for a Data Center. According to Article 645.10 of the NY City Electrical Code all electrical services should be shut off, via a shunt trip breaker, located in the:
the intent is to provide a readily accessible disconnecting means to disconnect the conductors of circuits at the source. Either location is acceptable.
- Building's electrical closet distribution board or
- The distribution panel in the Data Center.
Section 645.10 - (12/2/2015)
- We have a fire pump on the roof of a 33 story hotel, we have a 2HR listed rated DEDICATED shaftway going from the cellar to the roof just below the fire pump room, is it permissible to install the NORMAL feed in this shaft with EMT conduit and THHN wire?
No, the feeder must be RGS conduit when installed in 2-hours rated shaft. See 695.6(B)(1)(2).
- The same shaft way above has a horizontal offset on the 16th floor the rated enclosure covers the conduit all way on the horizontal is this installation permissible as above?
No, see above.
- If this was and EMERGENCY feeder coming down the building for a fire pump will both (A) & (B) be permissible installations?
No. What you are describing is a fire pump circuit.
- In this same shaftway are we able to run the respective fire pumps control wires within that shaftway to the genset on the roof?
Yes, where they don't share raceways or pullboxes.
Note: Normal and emergency fire pump circuits are not allowed to share same 2-hour fire rated enclosures.
Section 690.7(C) - (10/7/2015)
- We are designing a 500kw canopy mounted (canopy will be installed above the building's roof) photovoltaic array on a commercial building. The inverter, combiner boxes, and DC disconnects will be located outdoors elevated approximately 16' above the building's roof (just below the canopy) and supported to structural steel. The only way to access the inverters, combiner boxes, and DC disconnects will be via a lift.
- Per section 690.7(C), can we design the source and output circuits for 1000VDC? All DC equipment (combiner boxes, inverters, DC disconnects) will be UL listed and rated for 1000v.
1000VDC PV system shall comply with NYC Electrical Code subsection 110.2(B)(5). Such installation requires review and special permission by NYC Electrical Advisory Board. The special permission will allow the installation and inspection to be subject to 2014 NEC.
- Per Section 110.2 - do all UL listed 1000VDC rated equipment (inverters, combiner boxes, DC disconnect switches) need to be approved for use in NYC? If so, is there a list of approved PV equipment for use in NYC?
Installation is subject for review in accordance with subsection 110.2(B)(5).
- Do sections 110.30, 110.31(C), 110.32, 110.33, and 110.34 apply to the 1000VDC PV system for workspace clearances at inverter, combiner boxes, and DC disconnects?
Section Subsection 695.4(B)(2)(4) - (2/4/2015)
- The new 5 story Ambulatory Care Center located above the flood level will have 120/208v Con-Ed entrance below street level, single 800kw, 277/480v, stand-by generator on the 5th floor and permanent provisions for 800kw emergency roll-up generator hook up at the street level loading dock. It is intended for emergency roll up generator to be a back up to a building stand by generator in case of its failure. The roll-up generator service switch at street level loading dock will be connected to the main emergency distribution board on the 5th floor and will have kirk key interlock with the standby generator service switch to inhibit simultaneous operation.
The request for special permission must be submitted to NYC Electrical Advisory Board.
- If the fire alarm and fire pump service switches are tapped ahead of the standby generator service switch it is our understanding that both fire alarm and fire pump will require additional kirk key interlocks to allow transfer between service taps ahead of generator disconnects for both- the street and the building generators as indicated on Option 1.
Taps and keys locations are acceptable.
- In order to avoid providing additional kirk key interlocks, additional service switches and additional 5-story long feeder runs for fire pump and fire alarm systems to connect ahead of the street roll up service switch- we request permission to connect both fire alarm and fire pump to the emergency distribution board fed by both kirk key interlock emergency generator service switches as indicated in Option 2 - similar to code exception for parallel generators. Please confirm that this is acceptable.
Taps and keys locations are not acceptable.
Section 695.6 - (4/1/2015)
- We are designing for a special service fire pump and in accordance with Appendix Q Section 188.8.131.52 of the 2008 New York City Building Code, we are providing power from the street side of the service switch and we understand that based on this section of the code, a secondary power source is not required. Please confirm.
A secondary power source is not required when connected to the street side of the service switch. The feeder from the basement to the special service fire pump is not required to be fire rated. See NYCEC, subsection 695.6(B)(2) for conduit requirements when not installing an alternate source of power.
- Also, does the feeder from the basement electric service up to the 8th floor special service fire pump have to be fire rated? And if so, would running the service outside the building negate the requirement for fire rating?
Section 695.6(B) - (12/2/2015)
- In a high rise building there are stacked fire rated electrical closets from the basement to the top floor, the emergency generator is located on the roof. The closets contain an approved automatic fire suppression system. Can the fire pump emergency feeder in rigid conduit ( non-concrete encased) be installed in the electrical closets as per section 700.9(D)(1)(1)?
- Does 695.6(B) where it says " they shall protected to resist potential damage by fire, structural failure, or operational accident" is it code compliant to install the emergency fire pump feeder in the stacked electrical closets, or must the emergency generator be located on grade level adjacent to the fire pump?
Fire pump circuits must be installed in accordance with subsection 695(B)(1). Location of generator is the applicant's preference.
Chapter 7: Special Conditions (Code Section 700.1 to 770.182)
Section Subsection 700.4(E) - (4/1/2015)
- Article 700.4(E) references and adopts with modifications the NFPA 110-2005 Section 7-13 regarding installation test requirements for emergency systems. A provision of Section 7.13.7 of NFPA 110 requires a full load test where the unit must pick up 100 percent of the nameplate kW rating on one step. This test is conducted after a 5 minute cooling period subsequent to initial acceptance tests of Section 184.108.40.206. In view of the common practice where emergency generators in may buildings supply not only the emergency and the legally required standby loads, but also supply optional loads, the performance requirement for 100 percent of generator capacity step load may not be achievable; particularly for natural gas fired generators in R-2 occupancy buildings. Our questions are as follow:
- Where Section 7.13.7 refers to 100 percent of the nameplate kW rating, is it the nameplate kW rating of the generator or is it the nameplate KW rating of the sum of all emergency and legally required standby loads (excluding the optional loads).
Name plate kW rating of generator must be used
- If the response to Q1 is the nameplate kW rating of the generator, may this requirement be waived or relaxed if the documented sequence of operation is such that the emergency, legally required standby, and optional standby loads will be applied sequentially?
Section Subsection 700.6(G) - (4/1/2015)
- Is it code approved to have a licensed electrician install a portable generator, connected to main panel with the use of a generator inlet box and manual interlock-kit. This is a private, single family dwelling.
Yes, when required permits are secured including zoning approval from the borough office.
Section 700.9 - (4/1/2015)
- Question regarding the rating for emergency feeders for generators, the 2011 NYC electrical code book article 700.9(d)(1,2,3,4,5,6) all state 1 hour rating for fire rated assembly. But the 2014 nyc bldg code chapter 27 (2702.1.7) states to follow 2702.1.7.1 thru 2702.1.7.2.1 which states a 2 hour rated assembly. Which code is enforceable and should be followed?
Subsections 700.9(D)(1)(1) thru (6) cover protection for Emergency Feeder-Circuit Wiring. Subsection 700.9(D)(2) covers additional protection for those rooms that house such emergency and transfer equipment. BC sections 2702.1.7.1 thru 2702.1.7.2.1 provide for protection of emergency equipment room, which happens to be a stricter requirement and therefore must be complied with.
Section 700.12, 701, 702 - (8/5/2015)
- As part of NYCHA's Hurricane Sandy Restoration work, we are installing natural gas emergency/standby generators on the roof to back up 100% of the electrical loads in multi-story residential buildings that are at or above 125' high. The emergency/standby generators will be installed on the roof of each building in weatherproof, sound attenuated enclosures. There will be a new dedicated automatic transfer switch room with a 2 hour fire rating installed at the ground floor levels of each building, elevated at or above the design flood levels, that will house emergency (Article 700) automatic transfer switches and legally required (Article 701) automatic transfer switches, Optional standby (Article 702) automatic transfer switches will be installed in either the existing main electrical room or in the new main electrical service room. Both the existing main electrical room and new main electrical rooms are located at or above the design flood elevation. Emergency, Standby, and Optional Standby feeders will be routed from the rooftop generators down the exterior of each building to the respective automatic transfer switch location. We respectfully request a code interpretation for the following:
- For the emergency feeders installed within the generator enclosure, do they need to be fire rated when installed in the generator enclosure? The generator enclosures will not have a fire suppression system.
- When the emergency feeders are routed exterior to the building can the conductors be XHHW insulation (non-fire rated) or do they need to be listed fire rated cables? We assume that once the conductors are installed in the interior of the building the emergency feeders need to be fire rated.
Outside the building is acceptable.
- If the response to item 2 above is they can be non-fire rated conductors when routed exterior to the building, can the transition from non-fire rated cable to fire rated cable occur interior in the building?
No, Exterior of the building.
- Can the Optional Standby Transfer switch be installed in the main electrical service room?
Section 700.12, 701, 702 - (8/5/2015)
- As part of NYCHA's Hurricane Sandy Restoration work, we are installing natural gas emergency/standby generators on the roof to back up 100% of the electrical loads in multi-story residential buildings that are at or above 125' high. The emergency/standby generators will be installed on the roof of each building in weatherproof, sound attenuated enclosures. There will be a new dedicated automatic transfer switch room with a 2 hour fire rating installed at the ground floor levels of each building or in new remote elevated electrical sheds, elevated at or above the design flood levels, that will house emergency (Article 700) automatic transfer switches and legally required (Article 701) automatic transfer switches, Optional standby (Article 702) automatic transfer switches will be installed in either the existing main electrical room or in the new main electrical service room. Both the existing main electrical room and new main electrical rooms are located at or above the design flood elevation. Emergency, Standby, and Optional Standby feeders will be routed from the rooftop generators down the exterior of each building to the respective automatic transfer switch location. The emergency, standby, and optional standby feeders will originate in respective service switches located in the generator enclosures. Each emergency, standby, and optional standby feeder will terminate at the respective transfer switch without local disconnect means at the transfer switch. Based on Local Law 111 of 2013, Subsection 700.12(B)(6) was revised as follows: "Outdoor Generator Sets: Where an outdoor generator set is permanently installed, and is equipped with a disconnecting means and such generator set is located within sight of the building or structure supplied, an additional disconnecting means is not required where ungrounded conductors pass through the building or structure. Appropriate signage shall be provided at the generator set and at the first disconnecting means within the building or structure supplied." We respectfully request an interpretation on the following: Do we need local disconnecting means at automatic transfer switches under the installation described above?
Section Subsection 725.136(I) - (2/4/2015)
- Can an electrical cable containing conductors for electric light that are separated from conductors for Class 2 or class 3 circuits within the same cable in accordance with 725.136(I) be used for connection to lighting equipment requiring both power and control conductors?
Yes, when listed as such and designated with "-PCS", and having a minimum inner jacket thickness of 30 mils or more.
Section 760 - (8/5/2015)
- In recent review of an installation in a private school building currently under construction, loose power limited fire alarm wiring (load side of power source) was found installed throughout the building, both exposed, and concealed in new partition construction, both above and within 8ft. of the finished floor. We respectfully request your formal interpretation of NEC 2008 article 760 part III as amended by NYC in the 2011 NYC Electrical Code, and its appropriate application to the installation described herein.
The installation as described is a code violation. All Fire Alarm wiring up to 8ft above floor must be installed in raceways in accordance with 760.130(1).
Section 760.33 - (10/7/2015)
- The 2011 NYCEC amendment article 760.33(B) requires a separate green insulated equipment grounding conductor to be installed where conduits supply 120V to the command center, control unit or distributed control cabinets. There are cables listed by UL under standard 2196 a 1(one) or 2(two) FHIT rated such as MI and MC where the copper sheath is recognized and listed as a suitable equipment ground. Is this an acceptable wiring method without the need for an additional separate equipment grounding conductor?
As per NYCEC section 760.46, MI cable is recognized wiring method for NPLFA Circuit Wiring. A Listed MC cable as FHIT system is not recognized as an acceptable wiring method.
Section 760.131 - (8/5/2015)
- We are requesting interpretation on the following regarding fire alarm wiring in mechanical rooms:
- Does NYC approved 150 degree fire alarm low voltage wiring for initiating and annunciation devices need to be installed in conduit above 8 foot in mechanical rooms under 900 square feet?
- Same question with mechanical room over 900 square feet?
Administrative: General Requirements
Section General – Administrative - (8/5/2015)
- Is a master electrician's license required for the complete installation of a electrified grid lighting system as per The Administrative Code of the City Of New York - Title 27 Construction and Maintenance Chapter 3 Electrical Code defines Electrical Work: The installation, alteration, maintenance, or repair of electrical wires and wiring apparatus and other appliances used or to be used for the transmission of electricity for electric light, heat, power, signaling, communication, alarm or data transmission.
Work described shall by be installed by NYC Licensed Master Electrician or Licensed Special Electrician, and material shall be approved by the department.
Section General – Administrative 27-3018(b) - (8/5/2015)
- By removing a panel from a wall after it had been previously de-energized and safed off at the service, by others, am I in violation of Provision 2 7-3018(b)?
Administrative Provision 2 7-3018(b) notes that before commencing any electrical work an application for a work Permit must be filed. As noted under provision2 7-3002, the NYC Electrical Code is enacted to regulate the business of installing, altering, or repairing electrical systems. Removal of a panel does not fall under any of these categories and is not noted the code. Some may argue that this is an act of alteration but by definition of the word, to alter is to change something, not to remove it. Electrical Permit Application ED16A, does not list removal of existing equipment under the noted categories required to be filed. Removal of existing de-energized electrical equipment is demolition work. Demolition contractors do not hire Electricians to do demolition work, which entails removal of electrical parts, after they have been safed off.
Where electrical equipment has been safe-off by an electrical permit and licensed electrician, such equipment can be part of filed and permitted work for general demolition work. Please note that such work in an electrical space that contains other energized equipment must be performed by qualified person as defined in the NEC Electrical Code.
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