Questions tagged [nec]

For questions about the National Electrical Code, NFPA 70. Just about all US jurisdictions that have adopted an electrical code use the NEC, often with a handful of local or state level amendments.

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23 views

312.6 interpretation when entering from the back of panel

312.6 lists (A) and (B) tables, for when NOT enterting oposite and entering on opposite wall of the box. How is the entering through the back wall interpretted? Technically it would be "NOT ...
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3answers
321 views

Can I splice NM-B cable in the ceiling? [duplicate]

I am moving my bathroom exhaust fan from its current location to 2 feet farther, over the shower cabin. I need to extend existing wire for this. I can't fish new wire because existing wire has been ...
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40 views

200A 240V Electric Panel Clearance

I am installing an electric panel. NEC 110.26A providing for 30" x 36" x 6'6" is met EXCEPT for the main water supply line which will runs against the wall and underneath it at floor ...
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59 views

Low-voltage LED light strip through wall to outlet - Allowed?

I am installing some cabinets in my basement media room. I'd like to use a Philips Hue Lightstrip for accent lighting. The other side of the wall on which the cabinets are mounted is unfinished - it's ...
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3answers
66 views

Two 14/2 cables for a Ceiling Fan with Two Separates Switches for the Light and Fan

Is this wiring scheme a code violation for showing two 14/2 cables controlling a ceiling fan with separate switches for the light and the fan a code violation? We are remodeling and added ceiling fans ...
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1answer
144 views

Outlet for built-in Microwave has 120v/20A (USA) breaker… what amperage receptacle is required?

Currently I'm not able to pull the built-in microwave out to examine the outlet, so am leaning on the expertise here. It is a duplex outlet and the connected breaker is 20A, constructed around 2005. I'...
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1answer
52 views

Do I need to do anything other than wire grommets to protect electrical wiring in a 2 1/2 inch steel stud?

I'm used to making sure electrical wire is setback 1 1/4 inch from the face of a wood stud, but what are the requirements (US NEC) for 2 1/2 inch steel studs? They appear to come punched out for wires ...
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2answers
110 views

Why would an inspection company flag two NM 12 gauge wires going through the same joist hole?

How many cables are you allowed to run through a single hole in a wooden floor joist? We have a question and good answers for the NEC guidelines. Why would an inspection company flag this and note ...
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34 views

Installing power for irrigation controller in conduit?

I have a property where the irrigation controller is mounted on an exterior wall-its power cable is plugged into a wet in use GFCI outlet. Beyond the outlet, the power cable hangs off the wall and is ...
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2answers
78 views

Can I extend 20 amp garage outlet? Or can I only move it?

In attached garage there is a receptacle with a single 20 amp outlet (marked as "Freezer" in a breaker panel). It is in inconvenient location. The idea is to extend this circuit to an area ...
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1answer
65 views

What are the NEC rules for holes in a wooden top plate?

What are the NEC rules for holes in a wooden wall top plate? Specifically, how far apart do the holes need to be and what is the max diameter of a hole? In NEC 300-4 I found "...holes shall be ...
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1answer
149 views

Single Ground Wire Run Under Floor Joists

I'm in the process of finishing my basement and, aside from a ground wire that was run under the floor joists, I have a fairly clear path for drywalling the ceiling along the floor joists. I have ...
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1answer
35 views

Any code points, other references on using compression and set screw fittings on same EMT run?

This is more a commercial/industrial electrical question, but there's no Stack for that, so; Anyone ever been dinged by an inspector for this? I can't find anything in the 2017 or 2020 NEC, even went ...
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2answers
76 views

Height of gang boxes for entertainment center

Wall mounted televisions are supposed to be at a comfortable viewing height when sitting down, according to most television and wall mount manufacturers (standard -- 42"). Now I'm working on new ...
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1answer
65 views

Retain access to recessed electrical panel

I have an electrical panel that is surface mounted to a sheet of plywood in an unfinished section of my basement. I would like to finish that section. The panel is rated for either surface mount or ...
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1answer
68 views

Which NEC code sections deal with outdoor junction boxes?

We had a neighbor move our junction box that is in a utility easement over our neighbors property. When he moved it, he used up all of the slack in the box and he also buried it under 4' of soil. ...
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2answers
93 views

What does the NEC consider to be a kitchen?

I understand that the NEC requires GFCI outlets in kitchens. But how does it define a kitchen? If a room has a wet bar, that's not a kitchen, right? What if we add some more appliances (maybe a stove ...
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27 views

Code regarding exterior disconnects, outlets and fixtures

What are the code requirements for wiring to outdoor disconnects, outlets and outdoor lighting fixtures? I've usually just ran the type NM cable directly to the box. It seems difficult to transition ...
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1k views

Can I run stripped Romex/NM through conduit?

If I have NM cable running into a junction box, can I strip the sheath of the NM cable starting inside the junction box and run the conductors without a sheath through conduit that is connected to the ...
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1answer
58 views

Plastic screw from inside outlet box to stud

So I went to Lowe’s to see Their selection of double outlet boxes and came across old construction and new. The new construction had nails on the outside. So I thought hey I’ll try it since I can ...
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2answers
127 views

Why do pigtails not count towards box volume capacity

I would like to know why pigtails are not included in the volume count for outlet receptacle boxes. I recently upgraded to a two way outlet and had a total of four 14/2 wires coming into the box and ...
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3answers
988 views

Are GFCI outlets allowed on new circuit installations?

A comment thread on GFCI outlet on 2-wire ungrounded question led to a discussion of whether GFCI is better/worse or even permitted at point-of-use (GFCI/receptacle) instead of GFCI/breakers in the ...
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3answers
72 views

Calculating subpanel breaker size

I'm building out a shop (within the same building as the main panel) and I'm considering adding a sub panel to make running circuits easier, and to make any future expansion easier. I'm unsure how to ...
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2answers
99 views

Can I run cable across the gap between floor joists?

I've been working on wiring my shop in my unfinished basement (sub-panel installed by a licensed electrician) and I've come across a question I haven't been able to find an easy answer to. There are ...
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2answers
114 views

What are the options for putting cabinets in front of receptacles?

I'll be putting some base cabinets in my townhouse (northern Virginia), on an existing wall with several electrical receptacles. The receptacles are near the floor, as this is not a kitchen, and would ...
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1answer
143 views

Smoke detector wiring - black wire in 3 wire appears to be damaged. Can I use power from AFCI circuit to power but use red wire to interconnect?

I have ~10 smoke alarms (one per bedroom, one per hall). Somehow the last one isn't working. The green light didn't go on. I've done some troubleshooting - swapped the connectors and swapped the ...
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3answers
155 views

Nearly all basement lights dependent on switch at top of stairs

I went to a house this evening for a showing and encountered a situation involving the basement lighting that I'm almost certain violates at least one part of the NEC. The house was built in 2000. The ...
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1answer
36 views

Calculate box volume needed with light

I think I know the calculation for this gang box, but I want to double check. Specifically, does the light count as a "yoke"? This is a 15A circuit. Per my other question (Calculate ...
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2answers
633 views

Can PVC conduit be run through garage/house firewall?

The wall between my garage and the rest of my house (US) is the usual drywall-insulation-drywall wall framed out with 2x4 studs. Can I run 1.5" PVC conduit through that wall perpendicularly (e.g.,...
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3answers
4k views

Why does US Code not allow a 15A single receptacle on a 20A circuit?

Living in the UK, where we have a different system of mains wiring, my curiosity was piqued by Is it okay to install a 15A outlet on a 20A dedicated circuit for a dishwasher? and its answers. Although ...
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1answer
37 views

Replacement or retrofit listed smart switches

Most smart (WiFi remote) light switches available online say "neutral wire required". For example, this Gosund dimmer. In some older houses, this requirement for a neutral in the switch ...
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2answers
48 views

Recessed light wiring

I am planning to install recessed light in ceiling of my 2nd floor condominium. Here are some facts. There is truss framing (picture attached) in the ceiling, between my ceiling and the upstairs unit'...
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1answer
73 views

Can I tie grounded/white and ground/bare from a subpanel to any grounding bar in in the main panel?

Suppose I'm wiring a 100 A subpanel, which receives my two phase wires (black, red/black), my grounded/neutral wire (white), and my ground wire (bare) from the main panel. Since this is a subpanel, ...
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1answer
93 views

Main Breaker Panel in Garage w/o Garage Doors

We have a recent second floor & garage addition, and the main panel was moved to the garage from its old location. Due to COVID and our general contractor's procrastination (we have since fired ...
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1answer
127 views

Do all outlets in detached workshop need to be tamper resistant?

Ok, I just failed my inspection. The inspector made some good catches. The only thing I question is he said all outlets in the detached workshop need to be tamper resistant. We are still on the ...
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1answer
176 views

Can wires go under the supply wires in my panel?

The only available knockout big enough for my #1 wires is on the right side of the panel. The new breaker (double pole 100A) needs to go on the left side of the panel. Can I cross my #1 wires under ...
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150 views

Can electrical conduit cross over a gas line?

I'm running conduit to my shop for a subpanel. The conduit coming out of my house crosses over my gas line (see pic). Is this allowed? I just put the conduit in and wondered if this will get ...
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2answers
134 views

Using spare red insulated 10 gauge wire as a ground

I had some spare 10/3 NM cable from which I repurposed the black, white, and bare wires and ran through conduit. There's a circuit junction nearby that doesn't have a ground and isn't spliced inside a ...
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2answers
176 views

How to secure supply wires to panel

I'm installing a subpanel that is fed by 3 #1 conductors and a #4 ground (Al, XHHW-2, individual wires). I would like to use a 2-piece clamp to secure to the subpanel and to protect the wires from ...
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1answer
170 views

GFCI Required for 220v outlets?

All subsections of the 2014 NEC 210.8(A & B) start off with "All 125v, single phase, 15- and 20-ampere receptacles..." I see no such requirement for 220v outlets. Can a 220v outlet be ...
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1answer
107 views

Does ground bar block my knockouts?

Can I use the knockouts right next to my ground bar, or does it permanently block them? I'm wondering if I am allowed to run conductors across/over the ground bar and if I can put EMT connectors in ...
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1answer
41 views

Is AFCI required for detached workshop subpanel?

As I read the 2014 NEC 210.12 AFCI protection is only required for a "dwelling unit", which would not include a detached workshop. Is that interpretation correct?
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1answer
99 views

Running NM and BX Cables – Stackable Staples – Rim Joists - NEC2017/2020

I mocked up some cable runs and was hoping someone could confirm that they don’t break any NEC2017/2020 rules. The wires are run along the rim joists on the upper edge of the wall right under the ...
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1answer
43 views

Does a dwang/blocking qualify as “protection” for non-finished walls?

The NEC stipulates that all wire running horizontally between studs must be protected. My understanding is that wire that runs vertically down a stud can be stapled to the center of the stud and that ...
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2answers
59 views

Does the NEC allow EMT to act as ground?

I'm considering running EMT through my shop for outlets, etc. Does the NEC allow me to use EMT as ground (i.e. no need for ground wire)? A related question: I may run wire through the shop's attic to ...
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2answers
115 views

Can both a 240V power supply and a 120V power supply, coming from a sauna heater's single power unit, go to the same outbuilding?

So the situation is as follows: I've found an electric sauna heater I want to use in the detached, outdoor sauna I'm building. The outdoor sauna is 55' away from the house, so I'm planning to bury PVC ...
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0answers
48 views

NM cable routing to panel backboard / side of the service panel. Take 2. Any NEC 2017/2020 concerns?

Going off of my previous question, I wanted to get a confirmation the below is compliant with NEC2017/2020 for connecting NM cable to a main panel. I have used a length of 12/2 NM cable to show how I ...
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3answers
1k views

Difference between NEC code book and handbook (who is the target audience?) [closed]

My city requires electrical work to be done in accordance to the 2014 NEC. Therefore, I am purchasing the 2014 NEC. I see there are several other NEC-related books available. My question is: What ...
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2answers
103 views

exterior NEMA 14-50 AND dual GFCI

I want to Install an exterior NEMA 14-50 (RV plug) and dual 120V GFCIs. (One on each leg). The whole thing is fed from a dedicated 50Amp Dual Pole breaker with 6AWG copper. Is this a proper way to ...
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2answers
76 views

How close can an IMC coupler be to the unsupported portion of the rise above a roof?

I'm setting up my entrance riser for my shop. The weather head is 13' up from the top of the panel box, and the shop "roof" is 11' from that with 2' of the 2.5" IMC conduit riser ...

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