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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2
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1answer
1k views

Is it against code to create a romex to thhn junction inside a conduit body?

I'm installing a 60A subpanel in my detached garage. I'll be running 2GA conductors, to leave the possibility of upgrading to 100A service in the future open. The Breaker I'll be using on the main ...
1
vote
3answers
650 views

Is a plywood backer required for all breaker panels?

I read online that a plywood backer may or may not be required behind a breaker panel, and that it must be painted black. What are the rules for this? And why must it be painted black? I'm in MI, USA ...
1
vote
1answer
2k views

How to determine what type and gauge of wire should used for underground wiring to a detached subpanel?

I Will be installing a subpanel in a detached garage. The subpanel will be 60 amp. The garage is about 30' from the main-panel in-house, and I will of course get an exact length before selecting the ...
1
vote
3answers
881 views

How do I determine the fill rating of a conduit?

I Will be installing a subpanel in a detached garage. The subpanel will be 60 amp. The garage is about 30' from the main-panel in-house, and I will of course get an exact length before selecting the ...
0
votes
1answer
5k views

How to properly ground a subpanel in detached building?

I Will be installing a subpanel in a detached garage. The subpanel will be 60 amp. The garage is about 30' from the main-panel in-house, and I will of course get an exact length before selecting the ...
0
votes
1answer
217 views

How do I wire a door bell?

Can anyone make an educated guess on how to wire so the door bell rings? The flat used to have door phone entry system, but it doesn't work anymore. So it is used as normal bell. In flat we had a ...
2
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0answers
43 views

Is it ok by code to enclose a residentail breaker box in a finished basement as long as there is an access door and what are the requirements? [duplicate]

I am finishing a basement and want to enclose the 200a service box and wiring with a framed cabinet of some sort. Is there any requirements for clearances and what you can enclose it with? I am in ...
1
vote
1answer
292 views

Framing interior non-bearing wall with 24" on center for sound proofing

I'd like to sound proof a few interior walls in my house using the techniques for the 52 STC here (http://www.soundproofingcompany.com/soundproofing-solutions/soundproofing-walls/) which is basically ...
1
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3answers
810 views

Can I drill a 3 1/2" hole through 5 joists?

I need to move a toilet to the other side of room approx. 6 ft I will have to drill a 3.5 in hole for the waste line in 5 floor joist on the second floor. Can I double them and still drill the 3.5 in ...
5
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3answers
436 views

Should I be able to just peel tile off the wall by hand if it is installed right?

We hired a contractor to remodel our master bathroom. For the tile installation in the shower, he started with a float-cement backing. To show quick progress, he rushed through this step and the final ...
5
votes
1answer
2k views

Can I install a receptacle outlet below a window?

I need to add a receptacle outlet to an existing line. I will run the line from an existing receptacle outlet. Is it okay to locate the new outlet below an existing window?
2
votes
2answers
476 views

How do I install fire blocking while finishing a basement?

In Colorado, the building code asks for a fire block when finishing a basement. I know this goes against the out walls (foundation). I've seen 2x4 and OSB used: which is better? And how does the OSB ...
4
votes
3answers
532 views

Is it okay to protect NM Cable in an unfinished basement with ENT?

Adding a 20 amp subcircuit (120V) to furnace room to turn it into a workshop. Initially it will have one duplex and 2 fourplex receptacles, the fourplex receptacles will be on cement walls, the duplex ...
0
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0answers
72 views

Replacing drywall above boiler… to Code? Inspection?

I own a mid-1800's house in New England, with a fieldstone foundation and dirt floor basement. I now have a mold problem in the basement. There is lone sheet of drywall above the boiler & water ...
5
votes
1answer
633 views

What should I do about old cables that have been damaged?

I was replacing some drywall and noticed the wiring underneath has a couple of surface tears. House is from the sixties, but has been rewired with new Romex, except this circuit. Wire seems to be old ...
3
votes
2answers
295 views

Is it acceptable to splice a circuit in two opposite directions for outdoor recepts/lighting?

Per the 2011 NEC, is it acceptable to... Splice a circuit (using a junction box indoors) as long as I leave it exposed, use the correct wire connectors, and have it covered? Use this run one side ...
1
vote
2answers
99 views

For planning interior walls, should I get an architect or interior designer or someone else?

I am thinking of adding interior walls to divide up a large space (a walk-up basement). But I am clueless regarding building codes and I don't know where I can and cannot put walls. I've read a ...
1
vote
2answers
741 views

gas line location for natural gas clothes dryer

In the US, what are the usual code requirements governing where you can put a gas clothes dryer relative to the gas line, and governing length and clearance for the flexible gas line between wall and ...
-2
votes
1answer
201 views

Residential electrical installation, at what voltage is a licensed contractor required?

I'm trying to figure out regulatory requirements for residential electrical installations. Specifically, when is a licensed electrician required by code to perform an installation? Obviously you don't ...
2
votes
1answer
166 views

How to reroute a circuit that goes through a return air plenum

Old house, need to replace a wire where the insulation has been stripped off from when the original installer pulled it through a joist. Normally I'd just follow the original path of the old wire, ...
1
vote
1answer
251 views

Do smoke detectors have to be hard wired in New Jersey?

I'm rebuilding after a fire, and I need to know if the new smoke/co detectors need to be hard wired.
6
votes
1answer
1k views

How can I replace 2-prong receptacles in a code compliant way?

I have some 2-prong non-grounding type receptacles, and I'd like to replace them with 3-prong grounding type receptacles. According to National Electrical Code, what are my options?
1
vote
2answers
181 views

What's the proper procedure for replacing ungrounded circuits?

I have a house that has several ungrounded circuits that uses the older 2 wire romex (pvc insulation, black woven jacket). I'd love to have AFCI protected circuits for the bedrooms, and grounded ...
1
vote
0answers
255 views

When did fire-rated Type X drywall become code? [closed]

I have 1/2" drywall in my attached garage. There is living space above it so current code would say to use 5/8" Type X fire-rated drywall. My house was built in 1977 so I was wondering when the ...
6
votes
1answer
3k views

How many cables are you allowed to run through a single hole in a wooden floor joist?

How many cables are you allowed to run through a single hole in a wooden floor joist? For example, could I run five 12-2 cables through a 1-1/8" hole? I know they physically fit, but is there a code ...
1
vote
0answers
135 views

Can a water heater be installed overhead?

Sorry for the long preamble: I'm doing a remodel which involves building a new attached garage. At the same time, I'm replacing the water heater because it is ancient. I have considered a ...
5
votes
2answers
6k 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?
3
votes
2answers
3k views

Can I terminate a ground wire to the neutral bus if the ground bus is full?

I have a Crouse-Hinds main load center. The ground bus is at the top left of panel and the neutral bus is at the bottom right of the panel. I want to add a 15 amp circuit for two outlets in my ...
1
vote
2answers
2k views

Can I mix 12 gauge and 14 gauge wire in the same 15 amp circuit?

I have 12/3 wire from a switch to 3 light fixtures; can I feed the switch with 14/2 wire from a 15 amp breaker?
9
votes
5answers
5k views

Why won't HVAC supply stores sell directly to the public?

I am quite shocked that every store in my very large metropolitan area that sells HVAC supplies requires purchasers to have HVAC contractors license. Which makes it very difficult for a very ...
2
votes
2answers
322 views

What are the code requirements for installing a ceiling fan alongside a fire sprinkler?

I have a fire sprinkler in my bedroom ceiling which is right in the middle. I want to install a ceiling fan. What are code requirements to follow?
1
vote
2answers
136 views

Is an electrical blank (or anything you have to screw off) an acceptable access panel?

Never installed an access panel that wasn't a lid or door. If we have to screw it off is it code for an access panel? See other question for example: What can I use for a very small access panel?
2
votes
3answers
552 views

Any problem with installing two identical circuit breakers in series?

Suppose I want to reduce risk of a circuit breaker malfunctioning and failing to disconnect a shorted circuit. What if I install two identical breakers sequentially (one after another) so that if one ...
3
votes
2answers
287 views

Does NEC allow for recessed lighting to be placed in a vertical wall?

I am about to start running electrical in my bathroom remodel and I am considering options for lighting. I have a wall on one side that has 5.75" of space (this was for recessed shelving in an ...
1
vote
2answers
13k views

Can I use these post brackets to attach railing posts on top of decking?

I found a Simpson strong tie product (BC40Z) 4x4 half post base, and it states its intended use is for attaching a 4x4 railing post securely on top of wooden decking. The following picture ...
0
votes
2answers
210 views

Are electrical subpanels safe in the bedroom?

If not, how do you correct it, or can it be moved without making too much work?
1
vote
2answers
196 views

Is it code to have electrical wire going no where?

I have a wall open in the center of my house. I am going to run some 14-2 up it and and to about 5 feet from my panel, leaving plenty of extra wire to hook up in a few months. On the other end I am ...
5
votes
2answers
2k views

How do you secure electrical outlets in a concrete block wall?

I have an old home that has several outlets in the exterior wall. These outlets are not secured to the block, they just dangle in the opening and are only secure (or appear to be firmly in place) due ...
1
vote
0answers
102 views

Can I attach a metal box for a vanity light to a wood cross?

I am redoing a new bathroom. I have a metal electrical box that I want to replace (because it is an odd size from the 50s). The current one is simply screwed to a wood cross (2x4) running ...
3
votes
2answers
3k views

In what year did venting bathroom exhaust out of the house become a code requirement?

what was the year for code for vented bathroom exhaust fan? What is the code for vented bathroom exhaust fan?
2
votes
1answer
583 views

What is the maximum number of connections to pipes?

Does anyone have a table of the maximum number of connections that drain/vent pipes can have for a given size?
0
votes
2answers
262 views

According to NEC 2008 can you use non-metallic boxes in framing that transports environment air?

In the Home Owner's electrical test, the term "environmental air" is used. What does this term mean, and where is it defined? and can you use a non-metallic box? Also when reading the question do ...
2
votes
2answers
724 views

What do I need to know before taking the home owner's electrical test?

Inspector came over and checked out my basement today. He suggested that I take the `local home owner's electrical test to sign off on that part of the permit. They give you the NEC 2008 handbook, ...
1
vote
1answer
851 views

Can I connect the generator neutral to my mains neutral permanently?

I have a 3 phase 15KW generator with four wires. I want to use it as a standby generator for my house. My house uses 1 phase 220 volts on two wires (no ground as the house is quite old). I have a 3 ...
2
votes
2answers
519 views

What type of wiring should bedroom overhead lighting have?

On the phone with a friend in Cali this morning. He said that some municipalities are requiring /4 (12-3 or 14-3 romex) wiring for all new construction or rewiring for overhead lighting components. ...
3
votes
1answer
207 views

How can I find out if a vapor barrier is requried for finishing a basement to code?

I'm planning out a basement finishing project, and I'd like to do it correctly. I've done a lot of research but what I can't tell is if I do, or do not, require a vapor barrier. I was hoping from a ...
2
votes
3answers
271 views

Is it safe/compliant for one circuit to supply grounded wall outlets in both a kitchen and a living room?

On one side of my wall (in kitchen, not the refrigerator or stove plug) is a three prong grounded outlet. Would it work without overloading a circuit to put a new outlet on the other side of the wall ...
2
votes
1answer
485 views

Can I run an unrelated electrical cable under a bathtub?

I have an older house with a mixture of grounded and ungrounded outlets. Every room has at least one grounded outlet in it, except one. I've long wanted to run a new cable to that room and at least ...
2
votes
2answers
1k views

What is the difference between MSS SP-80 Type 1 and Type 2?

I have a bronze gate valve whose spec sheet says it conforms to MSS SP-80 Type 2. However, the project standards specify that the gate valve must be MSS SP-80 Type 1. What is the difference between ...
1
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0answers
134 views

Where can we recycle washing machine and kitchen sink drain water?

I would like to know the best place or method to recycle drain water from the kitchen and washing machine. Can we use it for gardening (as it contains soap and oil)? Or it can be added to a Biogas ...