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.

Filter by
Sorted by
Tagged with
8
votes
2answers
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 ...
0
votes
1answer
50 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 ...
2
votes
2answers
104 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 ...
6
votes
3answers
969 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 ...
2
votes
3answers
58 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 ...
1
vote
2answers
70 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 ...
2
votes
2answers
56 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 ...
0
votes
1answer
68 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 ...
1
vote
3answers
75 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 ...
2
votes
1answer
29 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 ...
3
votes
2answers
254 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.,...
18
votes
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 ...
1
vote
1answer
34 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 ...
1
vote
2answers
45 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'...
0
votes
1answer
49 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, ...
7
votes
1answer
87 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 ...
0
votes
1answer
46 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 ...
6
votes
1answer
171 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 ...
2
votes
0answers
55 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 ...
0
votes
2answers
97 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 ...
1
vote
2answers
160 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 ...
0
votes
1answer
66 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 ...
1
vote
1answer
99 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 ...
2
votes
1answer
38 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?
3
votes
1answer
56 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 ...
2
votes
1answer
40 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 ...
0
votes
2answers
54 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 ...
2
votes
2answers
55 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 ...
2
votes
0answers
39 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 ...
4
votes
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 ...
1
vote
2answers
64 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 ...
2
votes
2answers
73 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 ...
0
votes
1answer
67 views

How can I combine the two panels in a duplex on one meter?

I own both halves of a duplex (200 amps each) which I've converted into one house. I would like to have one energy bill. Is there a simple way I can easily feed service to the second panel from the ...
1
vote
1answer
70 views

When did color-coding NM-B cable become standard in the US?

Wandering through the electrical aisle of my local big-box store, I see that it is now basically impossible to buy NM-B cable that doesn't adhere to this color coding: 14 AWG = white jacket 12 AWG = ...
1
vote
1answer
54 views

NEC Rules for Placing Outdoor Receptacles (Residential)

What are the rules for where you can place an outdoor receptacle on your home? I read somewhere (can't remember where) that you are not allowed to tap power from inside a kitchen or laundry/utility ...
0
votes
1answer
142 views

I need to power a dryer and a sauna from the same 220v/30a breaker, but not simultaneously

I have a 220V 30A dryer line with an outlet plugin for my dryer. The dryer, the outlet, and the circuit box are all in the basement. The circuit box doesn't have room for an additional circuit. I ...
3
votes
1answer
131 views

Stapling NM cable to panel backboard on the side of the service panel. Any NEC 2017/2020 concerns?

Wasn’t able to use the suggestion in this answered thread Securing NM wiring on the electrical panel back board - Multi-cable staple the way I thought “nipples” on top of the panel would work out. Can ...
2
votes
3answers
136 views

Is my plan to move and upgrade service panels reasonable?

I'm adding a workshop needing its own 200A panel, and power company (TEP) is requiring me to move the service entrance from the house to the workshop (and upgrade to 400A panel) the house is to be ...
2
votes
1answer
136 views

Securing NM wiring on the electrical panel back board - Multi-cable staple

Would much appreciate your input on whether - It's NEC 2017 approved to use the below (or similar) multi cable staple when securing NM cable within 12" of the service panel, by attaching the ...
1
vote
0answers
54 views

NEC 2020 Compliant feed to an outbuilding

I am doing something similar to Running Service to Outbuilding. I tried asking for clarification there, but couldn't figure out how to. Sorry to start a new Q. If there is a better way, I'd appreciate ...
4
votes
1answer
82 views

Requirements for Surface mount raceway using THHN

At the top of a 14' wall in a private residential (non commercial) work shop, I'd like to run about 100' of surface mount raceway, with THHN conductors inside of it. I plan to use 4"x4" ...
1
vote
1answer
275 views

Can you put an electrical switch inside a walk-in closet according to NEC?

I have a walk-in closet where I would like to put a switched light ceiling-mounted fixture. According to NEC can I put the switch inside the closet (next to the door), or does the switch need to be on ...
0
votes
3answers
622 views

How can I safely get power strip to desk in center of room?

I can't even tell if this is a stupid question anymore. I have a desk in the center of a 12′ × 13′ room, on which I would like to have a power strip to power a computer and other, less power-hungry ...
2
votes
1answer
109 views

Dishwasher and garbage disposal wiring in same gang box

I am in the planning stages of renovating my kitchen. I plan on wiring my garbage disposal under the sink and using one of those air switches to control it. The wiring is not a problem. However, to ...
1
vote
1answer
57 views

Is it required to use AFCI/GFCI breaker when replacing subpanel?

I'm replacing my subpanel at home. My jurisdiction adopts NEC 2017. When replacing a subpanel, is it required to have CAFCI on all circuit breakers for all 120V circuits? When replacing a subpanel, ...
5
votes
1answer
222 views

Code requirement for burying electrical PVC that runs along foundation

I need to run a circuit to the opposite side of the house from the service panel to an AC disconnect box. From my understanding this could be run with THWN wire in Schedule 80 PVC above ground if it's ...
3
votes
1answer
101 views

Securing wiring around the electrical panel - NEC 2017 appropriate?

Trying to make sure I am up to code for securing some the AC/BX wiring coming out of my QO main svc panel (QO142M200PCAFVP). Not a lot of room to work with, the joists run a bit over a foot above the ...
2
votes
1answer
202 views

Should smoke detectors be on AFCI/GFCI breakers?

I've heard conflicting advice whether smoke detectors should be on a simple over-current breaker or a AFCI/GFCI breaker. On one hand you want the circuit to be as reliable as possible and since there ...
3
votes
2answers
98 views

Installing NEMA 14-50 by use of NM-B in a Metal Flex conduit (dry location) code compliant?

Goal: Replace existing 10-30 (8/3 Al on 30A breaker) receptacle with a 14-50 (6/3 Cu on 50A breaker). Receptacle will be used to charge an EV (at 32A, but I think its only right to actually make sure ...
1
vote
2answers
80 views

Two 20A circuits in a single kitchen receptacle - what size box do I need?

I am wiring up my kitchen receptacles to have the top outlet on circuit A and the bottom outlet on circuit B. I found this question, which was helpful, but I was flipping through the 2017 Ugly's ...

1
2 3 4 5