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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28 views

By how much can I trim back the connectors of 1.5" PVC fittings?

We're installing the drain plumbing for a newly installed tub, and the drain shoe overshoots the tub drain hole. The tub has been mortared in place and can no longer be moved: A joist limits how far ...
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1answer
50 views

How much weight/many people can my rooftop deck hold? 2“x12”x20' joists, 16“ on center, 2”x4" framing under

How much weight/ How many people can my rooftop deck hold? The joists are 2"x12" over 20ft, 16" on center The framing under the deck is typical 2"x4" framing (living space), on a concrete ...
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2answers
66 views

The structural integrity of a backyard structure

I need a shed, but I really don't want to put a standard-looking shed. I would like something that's pleasing to the eye and fits my property. In addition, I thought it would be cool to have a second ...
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1answer
38 views

ok to run PVC pipe behind gas meter?

I am considering installing a radon mitigation pipe system in my home, but the only area where I could reasonably have the pipe exit my home is crammed with all my other utilities. The best spot I've ...
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2answers
76 views

Code requirements for adhering wall light to electrical box - does the light need to be attached to the box?

I have a wall light which I'd like to mount on a wood board for decorative purposes. Below are photos of the light from the front and the back, and then a photo of the light on the board. I don't ...
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1answer
76 views

Can Canadian panels be used in the USA?

Here's a slick Canadian subpanel with a "generator interlock". It is a normal 2-pole panel, just like common USA panels, and it's Square D QO, which is common as dirt in the USA. However for the ...
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1answer
44 views

Does the ground pigtail to the jbox need to match the largest circuit?

In California, I have a metal jbox and, in it, there is a junction for a 10/2 NM and a 14/2. These have different size ground conductors. Does the code require a specific size ground conductor to ...
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1answer
53 views

How to protect these NM cables?

I have an old chimney that an electrician used to run cable to the attic, and they protected them with small diameter metal conduit. I have run several more cables. I could run each in it's own tube,...
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1answer
51 views

Is Drywall needed on exterior wall of garage on concrete block, 2-story house in Florida

We have a home inspector (selling house) stating they want us to put up drywall on an exterior wall in the garage. I know it's code for ceilings and the abutting walls to the interior, but do exterior ...
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1answer
49 views

Remove switch that controls thermostat

I recently bought a condominium in a large building, built in 2005. It has a single thermostat, and the thermostat works fine. But right next to the thermostat, there is a switch. It looks like an ...
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1answer
23 views

Test gauge plug on domestic gas system

I am in the U.S. I know that it is a good idea to have a capped or plugged nipple outlet somewhere on your interior gas pipe system where you can mount a test gauge that can be pumpted to a certain ...
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1answer
110 views

Why are U.S. residential circuit breaker service panels so poorly designed?

I find as a knowledgeable home DIYer, that my Siemens 200 amp circuit breaker panel to be a pain in the butt to use. It is less than 25 years old, and yet it seems to have been intentionally designed ...
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1answer
113 views

Derating 6 current-carrying conductors?

I'm having a hard time understanding 310.15(B)(2)(a). Here's the boat I'm in: I hooking up a tankless water heater that calls for 3 40 amp breakers (it's a 24 kw Ecosmart). So I put in a sub panel in ...
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4answers
66 views

Do GFCI protected devices need to be labeled as such, if they are protected from another location?

I'm doing a fairly substantial rewire of about half my house. In many places, like kitchen, bath, and outside/garage, I've replaced circuit breakers in my box with GFCI or dual function breakers. ...
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1answer
55 views

Can you heat an entire house with wall-mounted gas heaters?

My house currently is heated by a hot-water boiler, with radiators in the main rooms. The bedrooms have no radiators (it's an old house and I guess when it was built they figured the central radiators ...
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2answers
82 views

Are switch screws sufficient for load grounds?

In California, in a metal gang box with the line ground attached to the box with a ground screw, I understand that I don't need to attach a ground wire to a switch (screwed tight, captive washers ...
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1answer
86 views

Electrical pipe heated by heating pipe - against the code?

Please see the picture below. The three pipes in the front are electrical (conduit). The big black pipe in the back is the heating pipe. I guess something went wrong when building the building and ...
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3answers
76 views

Is “14 AWG” NM-B allowed by the newest NEC for new residential construction?

Is "14 AWG" NM-B allowed by the newest NEC for new residential construction? My concern is what the NEC says concerning 14 AWG NM-B for new residential construction. I have been told that the "NEC ...
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1answer
50 views

Can a loadcenter main breaker be greater than the busbar ampacity?

Related to this question (Can a sub-panel have a larger main breaker than the feeder breaker in the main panel?) on having a larger "main" breaker in a subpanel than in the panel feeding it, my ...
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2answers
47 views

What is the most common stair tread depth and stair nosing length?

I am having my stairs rebuilt and was wondering what the most common stair nosing length is. I have seen code requires nosing overhang be no more than 1.25". Is 1.25" common? Or is 1" more common? ...
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2answers
92 views

Wire ratings in very hot attics, e.g. Phoenix where they go to 180F?

Someone asked a question about wire damage in an attic in Phoenix, Arizona. Links on the web confirm attic temperatures go above 180 degrees F, or 85 degrees C. Most wires have a 75C or 90C thermal ...
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2answers
150 views

Are there restrictions on having all the lights on one floor on a single circuit breaker?

I'm rewiring my house to eliminate knob and tube wiring on my second story. The panel only has 20 spaces, so I'm trying to be economical. My upstairs floor plan is a 70 sqft bathroom and 3 bedrooms, ...
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2answers
48 views

Finishing an attic, building codes, layout possibilities

Our attic is entirely unfinished - exposed floor and wall studs. It has windows and is wired for a single light fixture. There is a fixed staircase up to the attic from the second floor where 19.5 is ...
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1answer
67 views

Electrical power to a detached shop, 60 amp panel, 80 feet of wire, what size wire do I need?

I am running power through a conduit to a detached shop, 80 feet of wire, a 60 amp panel. What size and type of wire do I need?
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35 views

What are the minimum insulation code requirements for a steel arch building (Quonset hut) used as a residence?

I'm interested in building a steel Quonset hut home in central Texas. I've done a fair amount of research on what's involved, but I'm stuck on insulation. The IECC defines minimum insulation ...
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1answer
73 views

“Reportable” electrical issues in commonwealth countries

I have a friend in New Zealand who said he hired an electrician to come and do some minor work and while at this he found an unused electrical installation that he said was "reportable" and had to be ...
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1answer
127 views

What does NEC require for strapping down conduit and wire here?

Below is a picture of the current conduit and wire setup for my new underground service into my house with generator automatic transfer switch and manual transfer switch to allow me to switch to an ...
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1answer
69 views

OK to attach a metal electric junction box and armored cable (MC) to underside of subfloor in basement?

Is it OK to attach a metal electric junction box and armored cable (MC) to underside of the subfloor in a basement with an exposed ceiling? Or does it have to be attached to the side of the joists in ...
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1answer
31 views

How to interpret UL listing for NM Clamps stating diameter?

Most NM electrical clamps specifically list the wire combinations they allow, but others such as halex 90515 simply list a bundle diameter range (.835"-1.520") Does that mean that I can use as many ...
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0answers
88 views

Are receptacles installed upside down? [duplicate]

This is something that I have always wondered about. In ICI you often and almost exclusively see receptacles ground up. As the story goes it's to stop objects from sliding down an contacting the live ...
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0answers
21 views

How close to the top of a structural stud can I drill?

I'm in California. I have a 4x4 structural post jack stud and a corresponding king stud 2x4. I would like to bore a 1/2" hole as close to the top as possible through both the jack and king. I know ...
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3answers
5k views

Why do single electrical receptacles exist?

Given that the following are true. They are the same size. They take the same amount of work to install. Doubles are twice as useful. Double adapters are a thing. Why do single electrical ...
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4answers
269 views

How do I carry electrical power across a pond?

Suppose I need to run power to an outbuilding. The line will run underground. Between the supply and outbuilding is a long, wide pond. Going around the pond isn't really feasible. This is not a ...
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2answers
36 views

Will I have a code problem attaching a 1.5“ grease interceptor to a 4” drain pipe?

I want to install a grease interceptor in my house. The problem is that it will not fit under the sink, so I plan to put it in the basement. The problem is that the sink, laundry and dishwasher all ...
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1answer
77 views

Does Chicago building code allow open ceiling joists in a finished basement? [closed]

I'm finishing the basement of a triplex condo in Chicago (townhouse style with a shared entry/common space with one unit). The developer didn't consider a future finished basement when it was it was ...
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3answers
234 views

Can I use 14 gauge wire on a 20 AMP electrical circuit? [duplicate]

Running 12-2 Romex cable from the electrical panel to a J-box located in attic. J-box will connect two GFCI outlets and extend a 14-2 cable to the ceiling light fixture box, where other 14-2 cable ...
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1answer
28 views

Basement egress question

I'm considering remodeling one side of my basement, adding a new bedroom. I've been researching egress codes and it's not entirely clear to to me if my basement meets the egress code now, or if it ...
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1answer
44 views

Can I use leaded glass for tall window in stairwell?

I'm in California. My house, built in 79, has a tall 3x9 stained glass window in a stairwell, starting 10" from the floor. I had a window contractor out to bid replacement windows and he told me that ...
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2answers
48 views

Can I back feed my panel with a lower amp breaker than the service inlet?

I believe I can run my whole house off my current generator 3500W/4000Max if I don't use the electric stove and oven. The generator subpanel has power meters for both legs, which, even when my oil ...
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1answer
36 views

Can two kitchen disposals share a circuit?

I'm in California. Current code, AFAICT, requires a dedicated circuit for dishwasher. That means that, by default, the disposal (being under sink) would also have its own circuit. In my kitchen ...
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2answers
58 views

Do I need a certificate of occupancy for each building on a single property?

If I have 2 buildings located on one property do I need a certificate of occupancy for each building or does 1 certificate cover all buildings?
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1answer
92 views

Must a flush-mount panel actually be flush?

I'm in California. I have a flush mount electrical panel. I'm looking to install a second layer of drywall over the existing for acoustic reasons. This will result in the panel being inset by 5/8-...
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2answers
2k views

Considerations for hardwiring electronics project in wall

What things will I need to consider for hardwiring a planned electronics project into the wall? The plan is a DIY smart thermostat. An LCD touchscreen panel will be flush with the wall. Attached to ...
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0answers
62 views

48AMP kiln on 60 AMP breaker *must be* direct wired in Canada?

I am trying to find out what part of the Canadian electrical code requires that the 48AMP kiln, on a 60AMP breaker requires that it must be direct wired, instead of using the NEMA 6-50 receptacle ...
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0answers
54 views

Is CSST piping and water piping in an inaccessible crawl space against code?

The CSST line that feeds our upstairs dryer with gas, the water pipes for the washing machine and some electrical wires run through an inaccessible crawlspace in the basement. When I went to turn the ...
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4answers
1k views

What NEC section, if any, covers an owner wiring their own home?

A question answered by Karl Katzke said: you are allowed to pull an electrical permit on your OWN residence Can anyone tell me if there is language in the NEC to this effect and if so what is the ...
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1answer
43 views

Double earth on metal case light fitting Qld?

Good morning, We have purchased a recently renovated home, and all of the pendant lights have metal casings around where the actual bulb goes in. The electrician we are using to rewire the house has ...
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2answers
687 views

Are Sonoff smart switches actually UL listed?

Sonoff is a system that comes up often on this stack. However, I notice it seems to be of unusually low cost, not available in retail shops, sold widely in the "dodgy side of the internet" (eBay, ...
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1answer
39 views

Does a ground need to be install in a 2' x 4' outside junction box?

i have a bunch of outdoors 2' x 4' open bottom concrete junction boxes. the question is, does each box need to have a ground rod installed and bonded to the ground wire? if so can someone please point ...
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3answers
111 views

How do by-room electrical code requirements work for a house with open plan or nontraditional rooms?

The electrical code imposes a variety of requirements for different rooms of the house, in a way that implies that the house is divided up into non-overlapping, specific-purpose rooms at construction/...