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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2
votes
3answers
132 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 ...
6
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1answer
277 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 ...
2
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3answers
160 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
240 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 ...
8
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1answer
663 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). ...
4
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3answers
1k 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 ...
8
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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 ...
2
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1answer
177 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 ...
1
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2answers
65 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 ...
1
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3answers
71 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 ...
0
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1answer
50 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 ...
3
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2answers
47 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 ...
3
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2answers
109 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 ...
1
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1answer
100 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 ...
0
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1answer
91 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 ...
4
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1answer
405 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 ...
3
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2answers
360 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 ...
2
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1answer
88 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 ...
2
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3answers
667 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 ...
7
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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 ...
6
votes
5answers
6k 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 ...
3
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2answers
127 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 ...
3
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1answer
308 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 ...
1
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1answer
111 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 ...
1
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2answers
311 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 ...
8
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3answers
3k 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.)
1
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2answers
767 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 ...
2
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2answers
100 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 ...
2
votes
2answers
215 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 ...
13
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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
1k 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. ...
4
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2answers
718 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 ...
2
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2answers
1k 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 ...
0
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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 ...
1
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2answers
153 views

Solar 240 VAC source and load wires sharing a conduit

I'm planning on installing a new electric oven and solar panels on my house soon. Given the location of everything relative to my electrical service panel, both the panels and the oven will need to ...
2
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2answers
786 views

Exterior to Interior Wiring and Code Deficiencies?

I recently installed a 100a exterior subpanel adjacent to my main panel to allow for the installation of 240V and 120V service to a shed on the opposite side of my house, along with a 240V dryer of ...
4
votes
2answers
293 views

What are the legalities associated with mounting splicing wire connectors?

There are some situations, such as those involving large junction or pull boxes that serve as central takeoff points for many-plexed homeruns or homerun banks, enclosures that form central splice ...
0
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3answers
469 views

How to run 10/2 THHN outdoor wire in finished basement along ceiling?

I need a 240v (intermittent load will be 14 A max) single phase outlet about 30 feet from my distribution panel in my finished basement. The distribution panel is outside on the first floor. I do not ...
5
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1answer
332 views

Can I paint a load center cover?

I would like to paint the cover and door of my flush mount load center to match the wall color more closely. The manufacturer does offer a white in addition to the standard grey cover, but it is hard ...
0
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1answer
118 views

In conduit with 75C wire, can I use #14 wire for 20A circuits?

I note that with 8 AWG wire... in NM-B (Romex) cable I can only get 40A: I am required to pull from the 60 degree C column of Table 310.15(B)(16). However, in conduit, with 75C wire (THHN) and ...
3
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1answer
98 views

1 generator + multiple ATSes: how can I install this to Code without unobtanium?

I want to supply standby power to both units in a separately metered duplex from a single permanently installed generator. The cheapest way to do this is a pair of bog-standard ATSes and a smallish ...
2
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0answers
51 views

How do I connect surface wireway to a breaker box?

I am running Legrand/Wiremold 4000 series for a garage shop. The instructions for the panel connector (4086A) consist of a tiny picture that implies all I need to do is cut a large square hole in my ...
7
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3answers
2k views

Any way to meet code with 40.7% or 40.44% conduit fill?

I’m running conduit along the walls in my shop (in a commercial warehouse) to provide power to some machines and additional outlets. The service is 3 phase, 208 V, 100 A. One of the machines requires ...
3
votes
4answers
1k views

Does this violate electrical code? (UF run plugged into GFCI to use smart outlet)

I built a deck on the back of my house last year and installed a new breaker and a handful of outdoor electrical outlets. I wanted one outdoor outlet to be switchable via a smart outlet, but my smart ...
1
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2answers
877 views

Can I retrofit a ground wire to my oven circuit?

I'm dealing with a 1970-built home and the oven has 6-3 without ground running to the oven. 2 hots and the neutral. Got a new oven coming in and want to make sure it's wired right. I could run new ...
9
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4answers
2k views

Why are 120 V general receptacle circuits limited to 20 A?

The NFPA-70 (National Electrical Code) prohibits the use of breakers larger than 20 A for general receptacles. But I have my doubts. A 20 A breaker on a 120 V circuit with appropriately sized wires ...
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0answers
52 views

Dedicated 240v 30A Circuit Switched for A/C and NEMA 14-30 [duplicate]

I have a dedicated 240 volt circuit that's hard wired into my air conditioning unit. The circuit has a 30 amp breaker at the main box and another 30 amp breaker on the wall next to my air conditioner....
1
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2answers
135 views

IBT and whole house transfer switch

The inter-system bonding termination (IBT) is where other services like telephone and cable TV get their ground bonds from the house's grounding electrode system (ground rods). 2014 NEC (NJ) 250.94 ...
1
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1answer
111 views

Stacking 'Main lug' load centers for garage

I am aware of most NEC codes and am actually asking if this is allowed, There really shouldn't be any reason..I also fully understand keeping my netural and ground seperate and how the bus bars are ...
1
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2answers
237 views

Why don't we just use combination AFCI/GFCI breakers for every circuit in a home?

With pretty much every circuit in a home needing one of the two types of protection (AFCI or GFCI), why don't all new homes have combination breakers installed just to be safe? Would it hurt anything ...