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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Residential garage breaker and outlet requirements

I’m upgrading wiring in my detached garage (in Burbank, CA), and I’m not 100% sure about a few things. It seems every branch circuit needs GFCI protection, but not necessarily AFCI protection, is ...
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Can I reuse an existing grounding rod and water pipe ground location?

Apologies for the dual question, but it's within the same topic, so hopefully it won't be too out of bounds. Situation: Upgrading to a 200amp panel requires ground upgrades at the residence in ...
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Does a conduit running through a ceiling need to be supported? [duplicate]

I will be running wire through a basement ceiling (not a drop ceiling) and I would like to avoid cutting holes in the drywall. I know that the wire on its own would need to be supported and secured to ...
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2 votes
2 answers
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Do I need a receptacle in my kitchen peninsula?

I am remodeling my kitchen, which includes a peninsula. The area of the peninsula as measured from the wall is 18.7 sqft, so I need 2 receptacles. One of them must be within 2' of the end of the ...
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Can I install a concealed 120 volt electrical outlet inside of my ceiling for a camera? [duplicate]

Is there a code the prevents me from installing a concealed 120 volt electrical receptacle inside of my ceiling for a camera? The electrical receptacle would be accessible using an access panel ...
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Should GFCI outlets be used with a refrigerator?

Recently I have been upgrading the old 15A outlets in my house to Leviton 20A 125V GFCI outlets (The wire size is 12AWG). It is a much older style home. So, for some strange reason the ground wire is ...
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moving a drainpipe to put in a free-standing tub on slab construction

While digging out the concrete to place the drain about 20 inches from its original location, I found a 220-power line, can you run 220-power under the slab 8-12 inches from a drain?
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Is UL/NRTL listing the only criterion for permitting direct-wiring into a junction box?

I've been trying to understand the NFPA70/NEC a bit better the last few weeks. If a part or component is UL-listed (or listed by another NRTL), is this the sole criterion for whether that part or ...
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How do I properly secure electrical conduit in a garage?

I failed an electrical inspection (State: NJ) the other day. The inspector said that because my shed could accommodate a car, the electrical conduit had to be secured better in case a car hit it. The ...
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Sizing generator based upon the NEC calculation

What size generator would you guys recommend for a 73amp load calculation? I read that a generator should run at 80% of max amperage. Generac has a 24kW (87amp on natural gas) and a 26kW (93 amp on ...
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Do Dual Function AFCI / GFCI Receptacles Meet NEC Requirements For AFCI Protection?

I have run out of room in my breaker panel, so I'm looking to double up with a tandem breaker. The problem is, it seems there are no AFCI tandem breakers, but I found these dual function AFCI / GFCI ...
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NEC Online Access?

I was wondering if there are any free sources to read the current NEC code online? If there is not a free resource, is there a "go to" that electricians subscribe to? I'm not an electrician, ...
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Can light switches be connected in a series?

I know this works electrically, so it’s more of an NEC question. Can one light switch control power to another? Here’s my use case. My basement (unfinished) consists of 3 rooms. I want the light ...
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How do I properly run CAT6 less than standard 8" from power cables?

I am trying to run CAT6 to a doorbell which is near 14-2 Romex triple gang box. It's on the other side of the wall about 6" from the 3 gang box on the other side of where the blue tape is marked. ...
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Main Panel Electric Question

I purchased a two family home and the electric was turned off by POCO. The current panels that were in the basement were rusted out old Eaton panels so they needed changing. I went to Home Depot to ...
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Cooktop and Oven wires

I have an induction cooktop that calls for a 50 amp circuit and a double wall oven that calls for 40 amp circuit. Both call for 4 conductors. Contractor ran a 4-conductor 6 AWG SOOW wire rated for 90 ...
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3-way-switched controlled and GFCI protected receptacles

My wife has a fish tank in the living room. It requires continuous power for the pump/filter, and automatically controlled power for lights and a CO2 solenoid. Since water is nearby I'll be putting it ...
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Does the NEC require cable to not be twisted?

I had a coil of cable in my attic that I pulled through to a light switch. Is there any danger with a twisted wire, or multiple wires that twist around each other in a wall?
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Multiple motion switches in parallel OR operation for stairway

2017 NEC 210.70.A.2 gives the following exception: Exception to (A)(2)(1), (A)(2)(2), and (A)(2)(3): In hallways, in stairways, and at outdoor entrances, remote, central, or automatic control of ...
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2 votes
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High amperage lighting loads prohibited by NEC?

2017 NEC 210.23.D says: (D) Branch Circuits Larger Than 50 Amperes. Branch circuits larger than 50 amperes shall supply only nonlighting outlet loads. What's bad about making light with more than 50 ...
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9 answers
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When running a bigger wire to deal with voltage drop on a 240V circuit, do I now need to run a neutral as well?

I am running wire for a 240 V, 20 A split-system AC over a hundred feet and the voltage drops below the allowed NEC 5% voltage drop. So I have to step down the a wire a gauge and run a #10 wire which ...
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2 votes
1 answer
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Wiring 240V two-element outdoor heaters

I installed an electric heater over my covered deck last year. My intention was to design and install a system that complied with NEC and would pass an inspection. I initially installed a single ...
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1 vote
1 answer
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Code Compliant splice of 18 gauge thermostat wire behind walls?

I'm finishing my basement and have many existing splices of 18 gauge (2 wire) for thermostats and the alarm system and central vac. I'll run new wire where I can but it's not an option for many ...
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3 votes
1 answer
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Does NM romex in conduit as a damage shield <24" long need to meet the <40% fill requirement?

There is an existing ~20"-long 1/2" EMT conduit run through a concrete floor between floors (old work). It would be convenient to run NM through the existing conduit instead of switching ...
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Can you feed power into a breaker of a loadcenter that has no dedicated main breaker, or must you use the main bus lugs?

For example: If a loadcenter has main lugs but no dedicated main, can I add a breaker and feed it to light up the bus and then add additional breakers for down-stream circuits? The idea is to have an ...
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3 votes
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Which of these conduit connections meet the "within 12-inches" requirement?

IIRC, conduit and NM need to be supported within 12 inches of the panel (and again every 10' for conduit or 52" for NM). Which of these panel attachments qualify for being supported "within ...
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2020 NEC and disappearing "rule of six" - will simple network topologies become impossible to implement?

In reference to my question Main and subpanels selection in new project I was told the 2020 NEC (that my state will adopt next year) will not allow a "ranch panel" to be installed anymore. ...
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2 votes
1 answer
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How to make a panel mounted voltmeter/ammeter in my main panel up to code?

I have already submitted a permit for and received approval to add a 50 amp inlet to my home for a portable generator. It will be 4-4-4-6 to an interlocked 50 amp breaker on my main panel. I'd like to ...
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Wiring in conduit - TH? Color coding? Grounding?

Installing tankless water heater - 18kW, requires 2 x 40A circuits. I have a lot of 8ga Black TW wire AND 3/4” conduit. Is TW still legal ( I have some THHN, but want to use up the TW where I can)? ...
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How do you verify a good ground connection when using EMT conduit as the ground?

When using metallic conduit as the ground wire, how do you confirm that the conduit provides a solid end-to-end connection? If using an ohm meter, how would you set it up and how many ohms are ...
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2 answers
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Can I legally add an outlet with 2 screws when the previous outlet was passthough with 4 screws?

My existing wiring has 2 black and 2 white and a ground. One pair is obviously source. The 2nd pair passes to the next outlet. The current outlet has 4 screws: black on one side and white on the other....
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6 votes
2 answers
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How should I mount conduit to my wood-laped siding?

I was thinking about using superstrut to hang conduit on the side of the house, but hangers would be easier because siding is wood-lapped so it is not a flush surface. I'm open to other options as ...
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1 vote
1 answer
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New outlets installed with wires for switch control, but tabs left intact

Before moving into our house recently I had inquired about a pair of switches in the living room that seemingly did nothing. The seller said that they were for a couple of the outlets in the living ...
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4 votes
2 answers
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Will this electric panel pass NC inspection?

Will this electrical panel pass inspection? I know there is a 3 foot clearance requirement but not sure if it's an issue here. This is a replacement panel in an old house that previously had an ...
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3 votes
1 answer
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Can I run my three-way travelers in a 14/2 without a neutral in the cable?

I have a surplus of 14/2 and a little bit of 14/3, and this project is price-sensitive, so I drew up this plan to make use of what I have on hand. It minimizes the length of 14/3 needed because that's ...
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can I use UF B cable to wire a dryer?

Can UFB cable be used for wiring my dryer? Normally I'd just run some NM able, but I found a good deal on 8 AWG UF B and wonder if this is code compliant (NEC 17) or not....or maybe there is another ...
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5 votes
2 answers
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Should I repair or replace floor joists with holes in poor locations?

I have seen some questions that are close, but different, and don't seem to answer my question. I'm in a late 1950s home and the previous owner drilled a bunch of holes in the joists in the basement ...
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3 votes
2 answers
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Romex/NM Clamp For PVC Sch80 Conduit?

During the last inspection visit, I was told that the pvc sch80 conduits I have needed to have some sort of fastening/clamp to secure the cable at the top of the sch80 pipe. Even though I had ...
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Are smoke/CO detectors required to be interconnected with wire?

I am planning on hardwiring 6 combination smoke/CO detectors on various levels of the house (2nd flr, 1st flr, basement) using 12/2 wire branching off from permitted sources (standalone 20a outlets). ...
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14ga Wire Out Of 20amp/12ga Circuit (outlet) To Power Smoke Detector

During some renovations I have opened up enough wall for the inspector to note that smoke/CO detectors need to be hardwired throughout the house. It is much more convenient to power them using the ...
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2 votes
3 answers
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Is it against NEC code to use 12/2 gauge wire for receptacles and 14/3 light fixtures in California?

I've been searching for answers but most of the questions involve using two separate gauges for the same circuit. I'm in the process of upgrading to a 200 amp service and I changed out all the ...
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1 vote
1 answer
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Ceiling Receptacle and ziptied NM cable - NEC 2017

Two questions: At a recent stop-over, a professional electrician mentioned that outlets/receptacles that are mounted in the ceiling (pointing down) are not permissible by code. The reason being that ...
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6 votes
2 answers
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Does electrical code allow NEMA 14-60R receptacles in residential settings?

I know that NEMA 14-60 plugs and receptacles exist, but they seem really rare. I've come across a few random online forums where people say that this is because they're not allowed by code, since any ...
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2 votes
3 answers
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SE cable indoors, thermal rating: 60C or 75C?

This is a Code question about Article 338, expect lots of Code cites. Any answer or challenge to answer MUST be well supported with Code cites, committee notes etc. The allowed temperature of a ...
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1 vote
2 answers
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AFCI - worth installing and not just GFCI?

How worthwhile is it to install dual-function CAFCI / GFCI outlets rather than going with ones that are just GFCI? Is it a significant increase in safety factor?
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312.6 interpretation when entering from the back of panel

312.6 lists (A) and (B) tables, for when NOT enterting oposite and entering on opposite wall of the box. How is the entering through the back wall interpretted? Technically it would be "NOT ...
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Can I splice NM-B cable in the ceiling? [duplicate]

I am moving my bathroom exhaust fan from its current location to 2 feet farther, over the shower cabin. I need to extend existing wire for this. I can't fish new wire because existing wire has been ...
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1 answer
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200A 240V Electric Panel Clearance

I am installing an electric panel. NEC 110.26A providing for 30" x 36" x 6'6" is met EXCEPT for the main water supply line which will runs against the wall and underneath it at floor ...
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Low-voltage LED light strip through wall to outlet - Allowed?

I am installing some cabinets in my basement media room. I'd like to use a Philips Hue Lightstrip for accent lighting. The other side of the wall on which the cabinets are mounted is unfinished - it's ...
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2 votes
3 answers
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Two 14/2 cables for a Ceiling Fan with Two Separates Switches for the Light and Fan

Is this wiring scheme a code violation for showing two 14/2 cables controlling a ceiling fan with separate switches for the light and the fan a code violation? We are remodeling and added ceiling fans ...
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