Questions tagged [code-compliance]

For questions relating to compliance with laws and ordinances of federal, state/province and local jurisdictions. Questions should also be tagged with the specific area of construction involved.

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8
votes
4answers
6k views

Is it ever safe to have 14 gauge wire anywhere on a circuit protected by a 30 amp breaker?

I was doing some work in an old house I recently moved into, and found that my dishwasher and garbage disposal (and some outlets near them) are on a 30 amp breaker. However, some of the electrical ...
7
votes
2answers
34k views

Can I wire a refrigerator and dishwasher on the same circuit?

Can I wire a refrigerator and dishwasher on the same 20 amp circuit?
7
votes
3answers
1k views

Per IRC, are flexible PVC couplings ever allowed to be used above ground for PVC to PVC connections?

It is my understanding that flexible PVC couplings (e.g. Fernco) meet the definition of Mechanical Joint in the international residential code. The 2015 IRC prohibits the use of Mechanical Joints on ...
6
votes
2answers
1k views

Code: How can a transfer switch not switch neutrals?

I'm looking at this Reliance Controls transfer switch. I certainly won't buy it and don't recommend one, but the huge hank of wires going from switch to panel only has one neutral wire in it. How ...
6
votes
3answers
1k views

Can I use metal masonry device (switch) boxes in a stud wall?

I am installing new wiring and need to place 5 lighting switches in one location (yes, I understand the problems/issues of confusion, etc.). These will all be 3-way switches, non-dimmable. I plan on ...
5
votes
2answers
2k views

Is Schedule 80 PVC Conduit Suitable for Short Directional Boring?

I'm running some electrical wire around where I'm building my house. There are two places that I'd rather not dig through: A driveway and a creek. The creek is the most important, because the state ...
5
votes
1answer
1k views

Do I need to attach a wire fished through a ceiling?

I have a finished basement and am mounting a flat-screen TV on the wall and I want to put an electrical box behind the TV. The two existing outlets are both two joists over and each separated with a ...
4
votes
1answer
10k views

What is permissible for a breaker box cover?

We're doing some remodeling in our kitchen and unfortunately the breaker box is right in the middle of a wall we are going to cover with tile. My current thought is to replace the existing metal ...
4
votes
2answers
2k views

How bad is it to attach a gas water heater to a gas furnace electrical circuit?

I'm looking to replace my existing water heater with a more efficient model. One of the things that makes better models more efficient is the replacement of the thermocouple / pilot control system ...
3
votes
2answers
248 views

Can I run NM wire through this type of flex legally

This flex is sold along other types of NM wire molding, but I can't find anywhere where this product explicitly allows NM or not.
3
votes
2answers
10k views

Can I run wires from two separate circuits through the same box?

Can I run wires from two separate circuits through the same box, if one of those circuits is just passing through (no connections)? I have a switch in the basement which is currently wired to outlets ...
3
votes
1answer
2k views

Unused electrical duplex box, soon to be hidden behind a bookcase?

I'm getting ready to install bookcases for my home office (SouthWest USA). One wall floor to ceiling consisting of four units screwed together. In one place there is a duplex outlet right behind the ...
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 ...
2
votes
5answers
10k views

Why are there multiple receptacles by amperage?

I could imagine the various receptacle shapes being a tool to protect you from making a mistake about what you plug in. Consider a 15A breaker with 14ga wiring to NEMA 5-15R receptacles. The circuit ...
2
votes
3answers
3k views

Do I have to connect the grounding electrode at a detached garage to the grounding electrode at the main structure?

Article 250.32(A) of the National Electrical Code, tells us that we need a grounding electrode at a detached garage. It also says that it has to be "installed in accordance with Part III of Article ...
2
votes
1answer
101 views

If I replace my main panel, will I need to fit AFCIs?

Code is NEC 2017. My existing main panel has plenty of ampacity but few spaces, and thus, is totally full. I have several potential paths for an upgrade. One involves fitting a subpanel and ...
2
votes
3answers
116 views

How to cut hole larger than 1/3 of joist?

I need to run a toilet drain (3”) through three joists (9 1/4”). Code states holes in joists can not exceed 1/3 the size of the joists. Catch is for 3” pipe I need a 3 5/8” hole — which is larger than ...
2
votes
2answers
3k views

When there are multiple circuits in a junction box do all grounds get connected

If I have a junction box where there are splices from several circuits, do I connect all ground wires from all circuits together in one bundle or do I do that for each circuit within the junction box?
2
votes
4answers
8k views

Space requirements for first subpanel and wiring preference

I would like to install two subpanels and my main panel is full of breakers. Would it be better to feed both subpanels directly from main or have 1st subpanel off main and 2nd subpanel off 1st ...
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
331 views

Can multiple panelboard interior/cabinet combos or loadcenters be chained together to form a single “logical panelboard”?

Background Both the houses I deal with (which are quite far apart btw) are in need of panelboard reworks: One still has the original fusebox, never mind that the main disconnect is basically at the ...
1
vote
1answer
279 views

Can you wire a 30A 2P standard circuit breaker “downstream” from a 60A GFCI 2p circuit breaker?

Will this still provide GFCI protection? Is this against code? Does this represent a hazard? I have a subpanel with a 60A GFCI circuit breaker, that I want to use that to feed to 2 30a 240v ...
0
votes
2answers
487 views

What is considered “servicing” for NEC 225.30?

I previously asked a question (Grounding subpanels located ~100ft from main breaker) where I was informed of NEC 225.30, which states that a building [...] shall be supplied by only one feeder or ...
0
votes
1answer
184 views

wiring lights and continuing the circuit to another light circuit

I have 1 switch running the 1st 3 lights then the next switch runs 1 light. I mocked this up with spare wire and it works, but is it OK to do it like this?
0
votes
1answer
293 views

Diagonal Bracing Requirements

I'm currently designing a deck to replace an existing deck on my home. The new deck is subject to different codes than when the original was built. The city provides a link to a design guide which I ...
0
votes
1answer
2k views

Why are 3-1/2 (16d) nails so hard to find?

So I'm a little confused. It seems like 21 degree fullhead framing nailers are fairly standard. According to the http://codes.iccsafe.org/app/book/content/2015-I-Codes/2015%20IRC%20HTML/Chapter%...

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