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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0answers
22 views

Canadian (Alberta) Residential Electrical Code

Is there a homeowners version of the current electrical code for residential wiring in Alberta available at no cost? I’m renovating my kitchen and would be helpful to know the many changes and ...
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3answers
94 views

Legal requirements for generator installation?

I would like to have a standby generator installed for my house. Based on my own assessment of our electrical needs, along with my desire to have a slower-running generator to reduce noise, and my ...
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2answers
63 views

Why are shower drains 2“, but tub drains 1.5”?

In the US, code dictates that the drain (p-trap and arm) on a shower use 2" pipe, while on a tub you use 1.5" pipe. I understand that is code, but I am curious as to why it is the way it is. ...
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3answers
76 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 ...
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1answer
77 views

Do two circuits on one receptacle require shared trip breakers?

In California I have two separate circuits powering a single a single receptacle (such as for a dishwasher and disposal). This is not a MWBC. Does current code require these circuits to be on shared ...
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1answer
28 views

Max sill height for windows as an escape and rescue in a group R-3 occupancy?

Don't have a IBC code book available, assuming it's answered in there. Google is giving me some confusing answers
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2answers
52 views

What are the requirements for a bathtub or steam shower in a bedroom?

We live in a suburb of Minneapolis. Our master bedroom has a decent amount of unused space. My wife really wants a steam shower. Rather than remodeling an existing bathroom, I've started thinking ...
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0answers
30 views

Q couple questions on the CA Plumbing, Electrical Code RE: keep-out distances between gas, electric

General: Southern California area Residential Experience with HV and high pressure N2/CDA systems from my work, but not flammable high pressure gasses. Question 1: Is there a minimum distance ...
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2answers
104 views

Can NM cable be installed in a junction box mounted to a floor joist in an unfinished area?

I understand that NM cable can be run along and through floor joists in unfinished areas of basements. However, can the NM cable then be installed in a box mounted on the joist, perhaps for a light ...
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2answers
55 views

Stair Illumination: Location of light

Before I close this up, is this legit location for light at bottom of stairs? Yes, switch at top and bottom, and light at top as well. Through some quirk of symmetry, this can light (of 12 total), ...
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1answer
41 views

In conduit with 75C wire, can I use #14 wire for 20A circuits?

I note that with 8 AWG wire... in NM-B (Romex) cable I can only get 40A: I am required to pull from the 60 degree C column of Table 310.15(B)(16). However, in conduit, with 75C wire (THHN) and ...
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30 views

Can I place a slide-in gas range up against plywood sheathing?

I'll be putting a slide-in gas range up against a knee wall. However, I planned on bracing the knee wall with 3/4" plywood sheathing from the bottom plate up 30", where it would be completely covered ...
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41 views

Fuel gas CSST line allowed in plenum in Texas?

I recently visited a house. The host pointed out something interesting. The furnace AC combo is in an indoor closet and is vertical upflow and sits on top of a filter base that sits on top of the ...
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1answer
52 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
93 views

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

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
76 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
55 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
81 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
87 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
54 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
60 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
91 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
50 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
24 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
121 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
183 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
418 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
69 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
85 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
99 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
92 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
54 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
65 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
116 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
316 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
80 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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51 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
75 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
250 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
102 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
33 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
287 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
95 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
353 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
30 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 ...