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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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Correctly Calculating Air Condition Load for Service Calculation NEC 2014

I am looking to install all new kitchen appliances and wanted to see if my current service would be sufficient. I am trying to calculate the service load using Article 220 of the NEC 2014 and I am ...
GZ704's user avatar
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3 votes
1 answer
223 views

Possible to convert disconnect to sub panel? [closed]

We've recently removed a hot tub that was originally installed in 1983. I'd like to know if it would be possible to convert the disconnect for the hot tub to a sub panel. The breaker in the main panel ...
Scott D's user avatar
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0 votes
2 answers
93 views

How much EMF interference, if any, is likely from 10-foot separation of conductors?

As I'm investigating my bathroom's wiring in anticipation of an update, I've found a violation of NEC 300.3(B) (that conductors need to run in the same raceway, cable, etc.). I understand that problem,...
Joshua Taylor's user avatar
3 votes
2 answers
91 views

Old house, difficult panel, new circuit question

1962 house with a lot of bad wiring, and I want to add a EV charging circuit without making it worse. I think I understand my options but hoping there is one I am missing. Homeowner not electrician ...
Linwood's user avatar
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2 votes
2 answers
87 views

Is conduit needed for extension of wall oven wiring?

I recently bought a GE in-wall oven (JRP20WJWW), but the whip power cable is too short (it was 45 inches, not 49 inches like the last oven). Since the power is on the left side of the oven and my ...
Roger's user avatar
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1 vote
2 answers
104 views

How many 100A/200A conductors can I run through a single conduit from my main service panel?

Current situation: main service panel (MSP) with 200A service on exterior wall. It feeds a single sub-panel via #2 copper conductors and is protected by a 100A breaker. These three #2 conductors to ...
divB's user avatar
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1 vote
1 answer
58 views

Adding 2 new outlets to existing GFCI's in two bathrooms

In the middle of a remodel. So I have two bathrooms connected on the same 20A circuit and both currently have GFCI. Bathroom 1(B1) GFCI is wired to the LINE/source and its LOAD powers Bathroom 2(B2) ...
bsong's user avatar
  • 67
2 votes
1 answer
110 views

Extension Cord Coming Out of Kitchen Wall Possible NEC Code Violation

In progress remodeling a basement kitchen in a home built 2003. Current NEC Code for my area is NEC 2017. When I pulled out the old base cabinet I found an live extension cord coming out of the base ...
DVS's user avatar
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3 votes
0 answers
56 views

Does NEC 2023 require conduit mounting hardware to be listed?

I only have the NEC 2020 edition on hand, but from what I'm reading on 358.6 for EMT listing requirements: EMT, factory elbows, and associated fittings shall be listed I think it's safe to assume ...
contrapsych's user avatar
8 votes
2 answers
2k views

Am I allowed to place a light in my small closet per NEC 2023?

I've been redoing all the electric in my house (because I'm pretty sure it's asbestos-wrapped aluminum cable everywhere, and I don't trust it at all), bringing it up to the 2023 NEC (which my ...
user112697's user avatar
0 votes
1 answer
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Cable sizing for subpanel

I’m in the process of finishing my basement. An existing 200amp Square D load center is in the basement. I want to add a subpanel in the basement about 75’ away. The subpanel will feed: Dryer (50amp ...
Gary's user avatar
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1 vote
1 answer
51 views

Would AFCI protection be required if I added another outlet to an existing branch circuit in a bathroom?

I have some confusion because on the one hand AFCI protection is not specified as needed in bathrooms by the NEC, but on the other hand the NEC does state that AFCI protection needs to be added when ...
max mel's user avatar
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1 vote
1 answer
51 views

Routing ground bonding conductor across garage

I am planning to install an antenna on the gable at one end of a house. The electrical service panel is on the other end of the house, about 100 ft away. I plan to install an earth ground outside ...
D.Mac's user avatar
  • 93
0 votes
1 answer
43 views

Does Kitchen's 2' Outlet Spacing Apply if Counter is Beneath Window?

I am remodeling my kitchen and trying to bring it up to code for wiring. I had an electrician out to scope the project and he mentioned that you need an outlet every 2' of counterspace. My question is,...
Fuzz Evans's user avatar
1 vote
1 answer
66 views

24VDC along side 120VAC Romex?

[context: NEC 2023, state of Colorado] I want to have this 3 gang box turn on overhead lights, pendants, and under cabinet LED lights. There is a combo dimmer/transformer/driver to run LED under ...
crichavin's user avatar
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0 votes
2 answers
105 views

Is it to code to have two SPST switches to independently power a single load?

Hopefully I can get away without drawing this: assume hot splits to two SPST switches and then each go to the load and neutral returns normally such that when both switches are off device is off, when ...
bvargo's user avatar
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2 votes
2 answers
336 views

Bonding at Meter vs. Main Panels

I think my head is going to explode trying to figure this out. Trying to go through and ensure the safety of my house's electrical system. It is a bit of a mess. Currently working on grounding and ...
alexok16600's user avatar
2 votes
1 answer
295 views

Does no-receptacle on >50% hardwired loads rule also apply for dedicated receptacles?

According to the answer from Can I wire my infrared heating panels to my existing circuits?, it is not allowed to have general purpose receptacles on circuits that have >50% fixed load. Does this ...
divB's user avatar
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0 votes
3 answers
348 views

Can I use a main breaker as an “occasional” disconnect switch?

I had a 100A service (MSP) with a 100A sub panel. I do not know the feeder size to the subpanel but it supports 100A but definitely not 200A. Last year, the service (and MSP) got upgraded to 200A. The ...
divB's user avatar
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4 votes
1 answer
946 views

Can I wire my infrared heating panels to my existing circuits?

I am getting two Wexstar 550W infrared heating panels that I will install both on the ceiling. They can just be plugged into a regular outlet. However, per FAQ they can also be hardwired and this is ...
divB's user avatar
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3 votes
1 answer
418 views

Are exposed cables along the ceiling in a finished garage code-compliant?

Bought a house a year ago, previous owner had an electrician re-wire a lot of the house when they did a bunch of remodeling about 4 years ago. They ran all the cables on the wood center beam in the ...
Ryan's user avatar
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0 votes
1 answer
63 views

Cabling electric cable (AWG 8) through roof of garage; NEC code?

I'm going to run shrouded 8/3 (240V) from the main box on the house through the air to the garage in order to feed an EVOCHARGE 32A EVSE. Ideally I will come through the roof (flat-roof garage) at a ...
Film juicer's user avatar
3 votes
1 answer
76 views

How should this UL-listed boiler cutoff switch maintain Class 1 separation?

The Guard Dog RB-122E Low Water Cutoff is UL listed, it requires 120V AC and is capable of switching 24VAC on the control side of a boiler. It is a self-contained metal enclosure with knockouts for ...
jay613's user avatar
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0 votes
1 answer
147 views

splice ground wires together in conduit bodies

Is it against code to crimp(Bond) ground wires together inside conduit bodies or to extend the ground. a city inspector(Bronx) stated it was not up to code and I'm unable to find any information on ...
Alberto Ortiz's user avatar
2 votes
1 answer
323 views

2020 NEC: Proper installation of PVC Conduit for Data Cables

I am installing a media enclosure in an under-stairway closet on my first floor. I plan on running Schedule 40 PVC conduit between the enclosure and the crawlspace directly below, as well as between ...
Morgan March's user avatar
0 votes
1 answer
75 views

Does NEC 2023 prohibit the modification of a light fixture's mounting system?

I have a bathroom in which the light on the wall is offset from the center of the vanity by about 6 inches. To avoid having to remove all of the wallpaper that is still in good shape, I bought a ...
Ryan Mortensen's user avatar
1 vote
2 answers
119 views

Relevant NPFA 70 sections for consideration when sizing a deep well pump

Previously I had little experience with well pumps, but after moving into a home with a failed pump in an area where a shallow pump is at 500', I'm beginning to learn a lot. Recently a pump servicing ...
mreff555's user avatar
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2 votes
4 answers
872 views

How can circuits be prioritized depending on real time demand?

I have a 125a service that’s part of a multifamily setup. I have been told by a licensed electrician contractor that upgrading my service to 200a would likely require $10k+ due to also needing to ...
fernandomrtnz's user avatar
3 votes
3 answers
497 views

NEC gurus: What does condition 2 mean in the exception to subsection 250.32(B)(1), to not run an equipment ground in a feeder to an out building?

I'm trying to understand the exception in the NEC, subsection 250.32(B)(1), which gives permission to use the grounded conductor as the ground fault current path. Apparently, in earlier code cycles ...
Nicknamednick's user avatar
2 votes
1 answer
124 views

What are the code requirements for outdoor plumbing and electrical surface-level conduits?

I'm planning to re-design my yard, and I'm looking to decouple the dependencies between contractors. I am planning to add some outdoor appliances (e.g. hot tub, sauna) which would require adding new ...
fernandomrtnz's user avatar
2 votes
1 answer
889 views

Rules for cutting additional holes in an exterior panel body

I am looking to see if the NEC has any guidance on where you can cut a hole into your outdoor electrical panel. (To add a cable clamp). The existing pre-marked knockouts are either used or require ...
bwp8nt's user avatar
  • 125
2 votes
1 answer
113 views

Installing a subpanel with a service entry cable feed-through a Powerwall subpanel

Based on this post on installing an EV charger, I decided to research installing a sub-panel next to an existing surface mounted indoor sub (Square D HOM2040L125PRB), which is used for Powerwall ...
user2558617's user avatar
0 votes
1 answer
59 views

Can I add an outlet to a sink disposal circuit for a TV?

I want to add an outlet for a TV in the living room. In the same stud bay on the other side of the wall in the kitchen is the switch for the disposal. The disposal circuit (20A) also feeds the ...
M3Driver's user avatar
1 vote
1 answer
172 views

Above ground (outdoor) UF-B cable and Conduit

We have a UF-B (12/2) cable run in PVC conduit above ground from panel onto a wall on a side of the house up to a point (fence comes then). Then the conduit goes underground and 90-degree and emerges ...
blackroses's user avatar
0 votes
1 answer
1k views

1 gang box fill capacity/size for receptacal and two 12/2 Romex & pigtales

I am installing a receptacle in a confined space inside some custom cabinetry, so I need to use the smallest (with respect to depth) box I can that still meets code. This is a remodel so the wire ...
Kenneth Baltrinic's user avatar
2 votes
2 answers
919 views

Metal clad cable: are there any useful residential applications?

MC cable is touted as a secure one. But when I look closely at its possible uses inside a residence (according to NEC code), I can see none. In all protected areas (like inside the walls), NM cable ...
Alexander's user avatar
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5 votes
1 answer
3k views

How do I wire to NEC code my detached garage?

I have read some of the NEC code but I am no professional. I am planning to run a 100amp sub panel in my detached garage with no more than 80' of wire, most likely URD 1/0 or so, from my main breaker ...
Collin's user avatar
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4 votes
1 answer
356 views

Do I really need to run so many parallel EMTs?

NEC gives max number of conductors for certain EMT conduit. For example, it’s 16x12AWG for a 3/4” conduit. Now it turns out this is really not the limiting factor at all. It is de-rating. Suppose I ...
divB's user avatar
  • 1,365
3 votes
1 answer
397 views

Do I need to separate my main and gas grounding conductors?

I have a garage with the electrical meter and gas meter on one side, and the water and grounding rods on the other side. I understand that the meter needs to be bonded to the water pipe and grounding ...
000's user avatar
  • 328
-2 votes
3 answers
269 views

Temp rating and insulation type of old nm sheathed cable

A family vacation home that we had someone build back in 1965 has a 200 amp service panel. A few of the breakers in my opinion are oddly sized for the loads that're on those dedicated ckts. The hot ...
A.G. Bell 's user avatar
5 votes
1 answer
857 views

What is the correct way to wire a Relay In Box (or similar relay) that has low-voltage signal wires bundled with 120V wires?

It is my understanding that low-voltage wires can share a double-gang box with 120V wires, as long as they are isolated from each other by a permanent divider. I was looking at getting this relay to ...
User41943's user avatar
  • 185
1 vote
2 answers
140 views

EMT fill capacity and derates mixing 14ga & 12ga

I have an existing 1/2" EMT conduit that has three switch runners, a hot for an unswitched outlet, a neutral and ground, for a total of six wires in 14ga THHN, all for the same 15 amp circuit. I ...
Kenneth Baltrinic's user avatar
4 votes
3 answers
170 views

Is it OK to bond an electrical box with 14ga wire if it also contains 12ga wire?

I have an AC unit on a dedicated 20A, 240V circuit running with 12ga THHN wires in 1/2 PVC conduit. In the middle of the conduit I have a metal waterproof convenience receptacle wired on a separate ...
BetterSense's user avatar
0 votes
2 answers
1k views

Hanging NM cables from floor joists in crawlspace

What is the best and/or code-compliant way to run NM cables on the underside of floor joists in a crawl space? Background. My wiring, done as a retrofit in the 1970s, has a set of runs (five #12/2's ...
hacktastical's user avatar
2 votes
1 answer
203 views

Can I cover a junction box on an unused circuit with an oven in a cabinet?

We're installing a cabinet with a double oven over where an outlet used to be. We've capped off the wires and will install a plate over them, but is that good enough if we put the cabinet in front of ...
J Parker's user avatar
2 votes
0 answers
69 views

Is running low-voltage DC wire (for LED) between outdoor PVC trim (post wrap) and the wooden post permitted by the national electrical code?

The proposed specific application involves running 16AWG wire (lamp cord) for a 12VDC LED light fixture that will draw a maximum of 2.25 amps, beneath PVC trim in a routed channel with cross-section ...
JeffM_A1's user avatar
  • 121
4 votes
1 answer
3k views

How and when must I satisfy NEC 2020 requirements for outdoor disconnect?

Context: I'll start with some context. As a single-family homeowner intending to replace an interior main panel with a 200A panel under permit, I am interpreting the National Electric Code (NEC) 2020 ...
Bit Fracture's user avatar
9 votes
4 answers
3k views

Does the NEC allow a sub panel to be powered by a generator and an automatic transfer switch?

I plan to install a sub panel next to my main panel. Mainly because as I do electrical upgrades, I'm accumulating more circuit breakers. Since I need one anyway, I'd like to be able to power it with a ...
Mike Gray's user avatar
  • 105
0 votes
1 answer
768 views

Can I extend feeder wires to my main panel inside the panel?

Per NEC, am I allowed to extend the meter-to-main-panel wires (hot, hot, neutral) inside the main panel using split bolt connectors? The wires could be a bit short for the new replacement panel.
mcu's user avatar
  • 163
1 vote
2 answers
2k views

Backfeeding a main breaker panel

Is the following allowed by NEC? • A main breaker panel is used as a main panel in a house. • The hot wires from the meter go to a breaker at an arbitrary branch location on the panel thereby ...
mcu's user avatar
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