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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1answer
322 views

What are the requirements for supporting non-metallic cable through a finished wall?

I know this basic question has been answered before by reference to 334.30(B), but there's an aspect I don't understand. Does 334.30(B) allow unsupported installation if 334.30(b)(1) OR 334.30(b)(2) ...
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1answer
107 views

Can a single set of conductors feed utilization equipment *and* a subpanel simultaneously under the NEC?

So, let us assume we have a set of conductors (hot/neutral/ground) going off to some piece of utilization equipment. Can I also run a set of conductors of appropriate ampacity off this circuit to a ...
2
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1answer
350 views

If a breaker is GFCI/AFCI protected, does the NEC still require garage and exterior outlets to be GFCI protected?

I am looking into upgrading the cabling from very old clothed 14-3 wire to 14-3 MC wire and the outlets in my garage and I understand they must be GFCI protected; however, can I simply replace the ...
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1answer
84 views

Hooking up additional outlets & lights to a central vac circuit?

My unfinished basement has a central vac on its own 20A circuit. The central vac is plugged into a 15A duplex outlet (not hardwired). I want to finish my basement and build a closet around the vac ...
3
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1answer
5k views

Do both legs in 220V have to be switched?

I posted this question but for some reason I can't get back into my account: Is it up to code to do a parallel circut with 220V? Is there a limit to number of splices? Most things I see with 220V ...
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2answers
568 views

Is it up to code to do a parallel circut with 220V? Is there a limit to number of splices?

State is Florida. I am wiring a continuous run non-submersible irrigation well pump. I am using a 30A breaker with #10 THHN in Sch 40 PVC conduit buried 18". I could have gone direct bury but I ...
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1answer
91 views

What's the Actual Code for Receptacles Below Counters in Peninsulas

I'm installing a kitchen that'll have a peninsula and I'm wondering about section 210.52(c)(5) where it says that "...receptacles mounted below a countertop must not be located where the countertop ...
3
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1answer
3k views

Can service entrance and branch circuit cables be commingled in an auxiliary gutter?

One of the major Code defects in my current house that I want to rectify at some point is the fact that the (only) panelboard is mounted too high up on the wall (the current panelboard's service ...
5
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1answer
15k views

Can Romex (NM-B) be run in conduit for more than 10 ft when starting from the breaker panel?

The answers to this question indicate that NM can be run in conduit: Can Romex (NM-B) be run through conduit? I was hoping to enclose 12-2 NM-B in EMT for about 20 feet from the breaker box up my ...
3
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1answer
155 views

Is it NEC-compliant to place a GFCI or AFCI receptacle or deadfront device in a location not readily reachable?

NEC 240.24 requires overcurrent devices (fuses/breakers, incl. AFCI/GFCI/DFCI breakers) to be placed so that their operating means is no more than 6'7" off the ground under most circumstances, and ...
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1answer
568 views

Should switch cover plates be installed before final inspection?

For final inspection should I put the switch/outlet cover plates on? It's a minor pain because we still have to tape, sand and paint. We are in Portland Oregon. This is in a bedroom, not a kitchen or ...
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1answer
423 views

15A circuit allowed to supply multiple general purpose receptacles?

For some reason I have it in my head that there is a section in the NEC which prevents the use of anything smaller than 20A circuits to supply multiple general purpose receptacles. While I know for ...
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2answers
582 views

Strain relief for cable into metal box - clamp ok?

I am having trouble fining a strain relief clamp to cover the hole into a metal canister (the canister for a heating unit). Is it ok to use an NM cable clamp - the kind you use around the hole going ...
2
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1answer
724 views

Replacing subpanel in detached building - yet another ground/neutral question

Here's the situation. I've added on to my detached shop/garage and need to upgrade the very small subpanel. The existing garage pre-dates the 2008 NEC by at least a decade, and is supplied by a 3 ...
2
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3answers
582 views

Semi-flush mounting a surface mount (NEMA 3R) panel

This is a new one for me. The owner needs a new main panel in a wet location but wants the box inset in the wall. I cannot find a reason not to do it, other than it will be a bit harder to wire. The ...
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2answers
371 views

electrical work: create “future boxes” - is this to NEC code?

I would like to run cable for an in-wall heater but not actually connect to the heater right now, I just want to get the cable run and connected to the sub-panel (along with all the other cables that ...
1
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1answer
483 views

Is it a violation of NEC code to install a receptacle horizontally and 3/4" from face of a stud?

A wall has been framed out to mount a touch screen computer monitor. Once the 1/4" drywall is installed, the monitor will be placed into this cavity and plugged into said receptacle. Question Does ...
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1answer
783 views

Grounding short section of metallic conduit or raceway used solely for protecting NM from physical damage without junction?

I would like to run NM wire in a short section of metallic conduit (e.g. EMT) perpendicular to the joists in my basement so I do not have to drill any additional holes in the joists as allowed by 334....
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2answers
338 views

Searching for NEC Code reference for service disconnect location

I'm looking for the NEC code reference that allows a main panel within a home to contain a main breaker because the meter is directly on the other side of the outside wall, versus installing a meter-...
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3answers
2k views

What problems might a single ground rod above 25 ohms resistance cause?

The Electrical Code (USA) requires that a single ground rod have a maximum resistance to ground of 25 ohms (NEC 250.53(A.2)). If this isn't met, an additional ground rod is required, but no resistance ...
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1answer
113 views

Unswitched hot in Fixture Junction Box

A comment on an answer to this question seems to be saying that its illegal for an unswitched hot to run through a light fixture junction box, even though its not connected to the fixture at that ...
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2answers
120 views

Do I need USA-color-coded wire on fixtures with flexible cable?

I often obtain lighting fixtures with flexible cords (but no plug) intended to be fed into a box and spliced. (e.g. this LED flood light). They are made in China for a world market, and have Euro ...
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1answer
569 views

Michigan Kitchen Sink Electrical Requirements

Wondering what the NEC code requirements are for Residential Kitchen outlets. I was told that the two wall outlets on either side of the kitchen sink have to be on separate circuits. The kitchen in my ...
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1answer
66 views

Electrical Disconnects for condensing unit

What year did the NEC code require electrical disconnects to be installed at HVAC condensing unit?
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1answer
1k views

Non-metallic conduit support on horizontal surface in inaccessible space

NEC says I need to secure 1" nonmetallic rigid conduit (Schedule 40 PVC to be precise) every 3 feet, which makes perfect sense when it is hanging between supports horizontally, across joists, or on a ...
2
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2answers
658 views

Is this type of ground wire connection NEC compliant?

Found this recently, done by a licensed electrical company in the state of California. Is this compliant? If not, is there anything that could be added to make it legal? (I see "ground clamps" for ...
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1answer
196 views

Can a cord and plug attached to a wallbox be used as a transfer means for fixed wiring downstream of the box?

So, we have a circuit that runs from the panel to junction box A, then to junction box B, and then onwards to a load. Can the fixed Chapter 3 wiring between junction box A and B be replaced by a ...
3
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1answer
229 views

What are the rules for making your own conduit KOs in nonmetallic junction boxes?

Some North American electrical boxes (usually nonmetallic ones) lack conduit knockouts, as they are designed solely to clamp NM cable. Unfortunately, some devices (the RIB series of enclosed, UL ...
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1answer
121 views

Is there anything that forbids an Article 409 industrial control panel within a dwelling unit?

Can an "industrial control panel", complying with NEC Article 409 and constructed with UL 508 listed devices, be used to control loads in a dwelling unit/residential occupancy? It would rely on the ...
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1answer
515 views

PVC conduit crossing a wire run

I have a garage which was wired up by an electrician to be my workshop. There are several runs of electrical cable (including one 60A, 220V circuit) running along the ceiling of the garage. They are ...
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2answers
116 views

Is rodent damage considered “physical damage” under the NEC?

Does the potential for rodents to access/gnaw on a cable under normal circumstances render it subject to "physical damage" in the sense the NEC intends that term to be used?
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2answers
2k views

Ok to conceal electrical junction box under cabinet behind removable toe-kick

There is a 5 or 6 inch gap between the floor and the bottom of my kitchen cabinets. I have ikea cabinets so the toe kick is connected to the cabinet legs by plastic clips. It comes off just by pulling ...
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4answers
1k views

“Local Amendments” to the NEC - What is meant by this term?

I recently encountered the term "Local Amendments" in responses written by Tester101 and Ed Beal. I would like to know what they meant by this.
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1answer
690 views

Are existing non-tamper-resistant outlets grandfathered in NEC?

My residence is a town home built in the late '90s, thus having non-tamper-resistant outlets. I assume that they are grandfathered in NEC? Am I required, by NEC, to install tamper-resistant when ...
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1answer
241 views

Does this j-box follow NEC electrical code?

I'm considering buying the following product for a security floodlight install: Arlington 8141-1 Vertical Siding Lamp Mounting Kit with Built-in Box for 1/2 Inch Vertical Siding LAP. It seems to get ...
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1answer
357 views

Is a plug adapter considered an “extension cord” under the NEC?

Is an adapter from a plug (say a NEMA 14-50) to a different socket (say a NEMA 6-20 or L14-20, or even a NEMA 6-50 for that matter) considered an extension cord by the 2014 NEC? If it isn't, then what ...
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1answer
2k views

Should exterior receptacles be on a separate circuit from interior receptacles?

For some reason, I thought I remembered reading in the 2011 or 2014 NEC that exterior receptacles/lights need to be on a separate branch circuit than one powering interior receptacles/lights, but now ...
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0answers
75 views

run data cable for outlet inside box?

I'd like to run a data communication cable through all of the outlets, light fixtures and switches in a house. (I already have the walls open for other reasons.) Think something like a hardwired X10, ...
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2answers
10k views

What to do with the wires when removing baseboard heaters

I recently put in a forced-air whole house HVAC system in my old house. I'll be yanking the old electrical baseboard heaters from everywhere in the house soon. I'm wondering what all would be ...
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1answer
16k views

Installing a new 240v receptacle - what do I need to know?

Provided I use a box large enough to meet the fill requirements (and use 10 AWG conductors), are there any additional requirements I should be aware of when installing a new 240v 30 amp receptacle for ...
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3answers
3k views

Under Nec 2011, I need neutral to every switch box; can I just use 2 14/2's instead of paying extra for 14-2-2?

I have two deadend 3way switches planned for the box (on the same breaker). I have 14/3 for each one going on, but then learned of the new rule about needing neutral at every box. I thought to replace ...
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1answer
174 views

Safe way to terminate exposed electrical during remodel?

I have a few exposed electrical wires that were cut in order to remove wiring in the area being remodeled. Is there a safe alternative to terminating all these points inside boxes? I need them safely ...
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1answer
2k views

How many circuits are recommended for this basement game room remodel?

Ok so this paint photo is roughly what I want to do to my basement. The lights are 6 inch recessed lights. The fireplace blower was on the old 15 amp circuit so I dont see a problem there. It ...
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2answers
334 views

Do electricians often/frequently interchange the color on the grounded leg when wiring switches?

A recent comment on this question said that it was not unusual to see the grounded leg of a switched circuit being used as the switched leg, there was some agreement. This seems a terrifying problem ...
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3answers
2k views

What's the difference between “physical damage” and “severe physical damage” in the NEC?

The 2014 NEC uses "physical damage" at various points to refer to well, hard knocks, if you know what I mean. However, certain passages in the NEC, such as 358.12 point 1 on EMT: Where, during ...
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0answers
131 views

Independent circuits on a common trip CB

Is it permissible under the 2014 NEC to feed two independent 120VAC branch circuits from a common trip (aka double pole) circuit breaker? The circuits do not share a neutral wire, and are ordinary ...
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2answers
1k views

Does the NEC limit the maximum size of junction boxes?

In this question, the OP has constructed a large junction box out of several extension boxes attached to a "regular" junction box: Is there any upper limit on the size of a junction box (either as-...
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2answers
3k views

Coast 3-way — does this conform with Code?

For those who aren't familiar, the California or Coast 3-way switching arrangement is a method of wiring a three-way switch circuit that is used when both a switched and an unswitched hot are desired ...
3
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1answer
299 views

Listed electric baseboard heaters that permit installation below outlets

Are there UL-listed electric baseboard heaters that do permit being installed below outlets? The FPN in 210.52: Informational Note: Listed baseboard heaters include instructions that may not ...
3
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1answer
3k views

When replacing non-grounding type receptacles is a GFCI receptacle required, or can any GFCI device be used?

Under the NEC (it was 210(7)(d)(3), but appears to have moved around some), it is permissible to replace an ungrounded receptacle with a GFCI receptacle, then wire further ungrounded or non-grounded (...