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
3
votes
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 ...
4
votes
1answer
14k 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
votes
1answer
152 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 ...
2
votes
1answer
541 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 ...
1
vote
1answer
404 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 ...
0
votes
2answers
563 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
votes
1answer
688 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
votes
3answers
546 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 ...
3
votes
1answer
287 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
vote
1answer
459 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 ...
0
votes
1answer
718 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....
0
votes
2answers
318 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-...
0
votes
3answers
1k 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 ...
1
vote
1answer
107 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 ...
1
vote
2answers
118 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 ...
0
votes
1answer
543 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 ...
0
votes
1answer
66 views

Electrical Disconnects for condensing unit

What year did the NEC code require electrical disconnects to be installed at HVAC condensing unit?
2
votes
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
votes
2answers
638 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 ...
1
vote
1answer
194 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
votes
1answer
225 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 ...
1
vote
1answer
120 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 ...
1
vote
1answer
498 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 ...
3
votes
2answers
112 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?
4
votes
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 ...
1
vote
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.
1
vote
1answer
640 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 ...
0
votes
1answer
237 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 ...
1
vote
1answer
350 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 ...
0
votes
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 ...
0
votes
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, ...
4
votes
2answers
9k 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 ...
6
votes
1answer
15k 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 ...
0
votes
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 ...
1
vote
1answer
169 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 ...
3
votes
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 ...
2
votes
2answers
333 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 ...
2
votes
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 ...
1
vote
0answers
128 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 ...
1
vote
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-...
1
vote
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
votes
1answer
298 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
votes
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 (...
2
votes
2answers
6k views

How do I properly place devices in an electrical enclosure?

I have to put together an electrical enclosure that includes, some terminal blocks, fuses, a power supply (110-24V,3.2A) all of which will be used to provide power for a series of sensors and ...
4
votes
1answer
1k views

Conduit Underground - Ways for tunneling under obstructions?

I'm running into a situation where it's increasingly difficult to bury this PVC underground 18" in some spots due to massive tree roots. Changing directions and/or destroying the roots isn't an option....
4
votes
1answer
1k views

NEC, use more extension boxes or an access panel?

What is the maximum number of extension boxes you can hang from a ceiling? This is ridiculous and I probably need one or two more to meet the new drywall ceiling. Are junction boxes permitted behind ...
1
vote
1answer
438 views

Code compliance with 120/240v outlet

I am updating the electrical in my garage. Right now, it has two GFCI 120v outlets, one on the outdoor outlets circuit and the other on the garage opener circuit. I am looking to add locking 240v ...
3
votes
1answer
2k views

Does the circuit providing a light at the electrical panel have to be ONLY for that light?

Does the circuit providing a light at the electrical panel have to be ONLY for that light? I'm fairly sure there specifically has to be a light at the panel, as well as a circuit with an accessible ...
1
vote
3answers
25k views

How many lighting circuits are needed in the LED era…? (US - NEC)

This is in a two story, ~1000square foot per floor building. With the advent of affordable, decent (IMHO) LED fixtures (finally!) the entire lighting load for the structure looks to be 500W - 1000W at ...
2
votes
2answers
33k views

Is it okay to staple romex to a floor joist when running it perpendicular behind a finished basement ceiling?

Taking down my ceiling to run some wire to new outlets. The outlets are going in an area with an unfinished ceiling, so I know the romex there will need to be ran through the joists when going ...