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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52 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 ...
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1answer
80 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 ...
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1answer
77 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 ...
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3answers
92 views

moving service entrance and upgrading to 400A with 200A workshop and 200A existing House panel

Im 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 ...
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1answer
59 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 ...
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0answers
48 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
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1answer
58 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" ...
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1answer
83 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 ...
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3answers
91 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 ...
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1answer
50 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 ...
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1answer
46 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, ...
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1answer
70 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 ...
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1answer
65 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 ...
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1answer
61 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 ...
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2answers
77 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 ...
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2answers
68 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 ...
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3answers
81 views

Securing NM cable along a steel beam

I'm planning on finishing my basement, and the wiring as-is is a mess, in the way of putting up a ceiling, and code deficient in several ways. So I'm looking at ways to rework the wiring, and I'd ...
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1answer
268 views

Calculate electrical box volume needed

I am replacing some 15A 14/2 outlets. All went fine except the last. I think the box is not large enough. (3) 14/2 coming into the box; one is the live the other two go to other outlets All grounds ...
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3answers
82 views

Refrigerator on a shared electric line with Stove and 5 countertop outlets

When we moved in our new construction home the dedicated fridge outlet in the kitchen was faulty. The builder sent his electrician who said the the entire line has an issue so they did a connection ...
4
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3answers
159 views

Soldering copper pigtails to aluminum wire

As I prepare to remedy my parent's 1965 home's aluminum wiring I have investigated Copalum and Alumicon. Copalum appears to be unavailable. I've tried a few Alumicon connectors but they take a lot of ...
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1answer
429 views

Using NEMA 14-50 with 60A breaker

An electrician installed a Tesla wall charger with a 60A breaker. I've added a NEMA 14-50 receptacle to the circuit behind a toggle switch (either the wall charger is powered or the plug, not both). ...
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3answers
815 views

Can 12 AWG THHN/THWN wire be placed in a buried conduit?

My understanding is all buried wire in conduit must be THWN-2. Per Southwire's spec sheet here the end of the first paragraph reads: All Sizes Rated Both THHN and either THWN (sizes 14, 12, and 10 ...
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4answers
1k views

Should I keep this surge suppressor in my main load center?

I found this curious item in my main load center (circuit breaker box), marked "SQUARE D COMPANY / SECONDARY SURGE ARRESTER / J9200-10". It has been there for at least 20 years, attached to ...
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1answer
101 views

50 Amp Outlet Disconnect Requirements

My county uses the 2014 NEC with no modifications. I'm wiring my newly built detached garage myself. I had the rough-in inspection, and everything was ok for it, but the inspector had some concerns ...
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2answers
61 views

Is AFCI a requirement outside the United States?

I have been asked to come into a site (outside of United States; Central America to be specific) - but one of the personnel there asked about NEC compliance; specifically AFCI. How can I educate ...
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3answers
69 views

Using steel conduit as a ground intermitantly. Any problems with this?

Small back story: This is a Philly row home, so the long wall are solid brick. original outlets were non-existant or embedded in baseboards. While most of the home is being wired with romex, I am ...
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1answer
44 views

Can I notch the end of a piece of fire blocking to accommodate a wire?

I'm framing a partition wall and a lowered ceiling on one side of that wall. The space above the new, lower ceiling will essentially be attic space, so the inspector said I need fire blocking in the ...
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2answers
44 views

Do breaker trip curves ever begin BEFORE the load printed on the breaker handle?

It's commonly accepted that the continuous load of a circuit should usually not be more than 80% of the rating of the lowest ampacity link in that circuit. Do breakers ever 'enforce' this de-rating ...
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2answers
87 views

Abandoning wire in attic space

I'm in the US, and I have three recessed lights daisy-chained from a switch, and I want to take the last one (#3) out of service. I'm lowering the ceiling in this area, so converting it to a junction ...
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1answer
70 views

Can I run two 6/3 NM cables up the same 2x4?

I have two 6/3NM cables coming from the attached garage ceiling into a subpanel mounted low inside an exterior wall. One of the studs is occupied by A/C pipes so I'm hoping there's a way to get both ...
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1answer
55 views

In which spaces can small-appliance branch circuits have “No Other Outlets”?

Goal: Understanding the NEC code language for practical DIY application. All occurrences of the phrase "no other outlets" related to a house (not an RV) in the NEC 2017 are: 210.11 Branch Circuits ...
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1answer
371 views

How is “continuous wiring” defined in context of the 2017 NEC code?

First, some context: About AFCI protection in Dwelling Units, NEC 2017: 210.12(A) All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices installed [...] shall be ...
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2answers
180 views

Back-to-back conduit bodies for wall transition

I am running an 80A (4AWG Copper) line for EV charging in my garage. I am using EMT conduit and I need to transition through drywall. Since the studs are not deep enough (2x4) for the minimum radius ...
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1answer
77 views

Will a SimpliSafe security system which include smoke detectors qualify under fire panel exception for the NEC's AFCI requirements?

To expand on the question I'm trying to put these AFCI's and GFI's everywhere I need them, but nowhere I do not. Also my experience with AFCI's up to this point have been poor. They trip when the ...
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3answers
551 views

Dual GFCI/AFCI breaker to support regular TRR USB outlets on kitchen counter: to code?

I would like to replace some outlets that run along my kitchen countertop because the TRR plugs are hard to plug in, and I would like to put ones that have USB jacks. I know that GFCIs are required ...
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4answers
1k views

How do you comply with NEC receptacle requirements in row homes with brick walls?

I'm rewiring a Philadelphia row home, which like many others, has brick and cinder block for the side walls. There is no framing, just lath and plaster. I know some flippers will put in 2x3 studs to ...
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5answers
4k views

Why do unfinished basements need GFCI outlets?

I was replacing outlets in the basement and noticed that unfinished basements require them to be GFCI protected. While I did do this, I can't help but wonder: WHY?? I searched for the NEC ...
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2answers
120 views

What is the maximum voltage you can have on exposed rails?

In this question, someone has a desk lamp with power totally exposed on metal parts. You also have installed overhead lighting on open rails doing the same thing. What does NEC say about the ...
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1answer
194 views

NEC Compliance: Removing a wall switch in favor of a remote for a ceiling fan

In my bedroom, there is a wall switch that controls a ceiling fan. I recently installed a wireless remote controller in the canopy of that ceiling fan so I could turn it on and off from the comfort of ...
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1answer
93 views

Do retrofit ground wires need to be run in conduit?

I'm moving my water heater to another corner of the room it is in, to allow for more usable space in the room. However, the grounding wire is only 14 ga instead of the required 10, and it's not in the ...
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2answers
161 views

2020 NEC code changes

OK, WOW, just reviewed the 2020 NEC changes scheduled to take effect this year. I'm asking if I'm interpreting the changes correctly: 1) Whole house surge protection. Required either between the ...
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3answers
2k views

Why aren't AFCI breakers required for bathrooms/lavatories?

Why doesn't NEC require AFCI breakers for bathrooms/lavatories? Is there a good reason NOT to install AFCI protection on a 15A/20A 120V bathroom outlet? (I.e., use GFCI only.)
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2answers
386 views

Does code allow for in-wall mounting of low voltage transformers?

I am asking if NEC code permits for in-wall (gang box) mounting of low-voltage transformers and power supples, and if so do these product have a name or term? My use case is low-voltage electronics ...
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2answers
93 views

Correct gauge and jacket type for feeder wire to subpanel?

I need to install a 200A panel about 100 feet from the meter base. I have 400A service coming to the building, broken out at the meter base into two 200A exterior disconnects. One disconnect is ...
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2answers
193 views

Does it violate US wiring code to have non-standard outlets?

Note: this is entirely theoretical. I have no (current) plans to actually do this. Would I violate any state/national building/electrical codes if I installed BS 1363 (UK plug/socket) sockets on a ...
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2answers
2k views

What range of heights are allowed for wall receptacles?

I need to mount a receptacle on a basement wall. If I can mount it high enough, it can go on the wood cripple wall instead of having to drill into the concrete and risk the excellent watertightness ...
2
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2answers
761 views

Why does NEC require circuit breaker locks only on hard-wired appliance circuits?

The National Electric Code (NEC) Section 422.30 requires "permanently connected appliances" to have "lockable" disconnects, so that power can be reliably cut to the appliance when it is serviced. ...
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2answers
701 views

Handybox Extension

Can you stack a handybox with an extension outside of the drywall? This puts the total box size at just shy for 4". I know handyboxes can be used with conduit, but can they be double-stacked in a ...
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2answers
851 views

How to wire up a 240 V oven?

I recently purchased a Whirlpool WOS51ES4ES electric oven from Home Depot with the intention of installing it myself. Our old oven is gas, so I need to run a new 240 circuit. The oven draws 20A. I ...
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3answers
74 views

Electrical Question for Receptacles in guest house

Wiring a out door shed that has everything that a home does; bathroom kitchen living room and extra bedroom. Pretty much like a guest home you can say. When I run my wire in the bathroom of it. The ...

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