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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1answer
80 views

Can a cord and plug attached to a wallbox be used as a transfer means for fixed wiring downstream of the box?

So, we have a circuit that runs from the panel to junction box A, then to junction box B, and then onwards to a load. Can the fixed Chapter 3 wiring between junction box A and B be replaced by a ...
1
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1answer
108 views

What are the rules for making your own conduit KOs in nonmetallic junction boxes?

Some North American electrical boxes (usually nonmetallic ones) lack conduit knockouts, as they are designed solely to clamp NM cable. Unfortunately, some devices (the RIB series of enclosed, UL ...
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1answer
76 views

Is there anything that forbids an Article 409 industrial control panel within a dwelling unit?

Can an "industrial control panel", complying with NEC Article 409 and constructed with UL 508 listed devices, be used to control loads in a dwelling unit/residential occupancy? It would rely on the ...
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3answers
309 views

House has no plumbing vent — is this a solution?

I've been living in a fixer-upper for a while... I've been fixing a lot that was previously done wrong. I've finally gotten around to ripping out our first floor bathroom (two full bathrooms) and ...
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2answers
127 views

According to NEC 210.52 can this receptacle be counted as part of the required outlets in a dwelling?

Under NEC code artcile 210.52 Dwelling Unit Receptacle Outlets ...The receptacles required by this section shall be in addition to any receptacle that is: (1) Part of a luminaire or appliance, or ...
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1answer
56 views

Is there anything in the NEC that would prevent me from attaching MC cable with ground to EMT with a compression coupling?

Is there anything in the NEC that would prevent me from attaching MC cable with ground to EMT with a compression coupling? I will be skinning the MC cable roughly about 10 to 15 feet where it enters ...
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2answers
81 views

Is rodent damage considered “physical damage” under the NEC?

Does the potential for rodents to access/gnaw on a cable under normal circumstances render it subject to "physical damage" in the sense the NEC intends that term to be used?
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2answers
189 views

Understanding deck spans for beams.

I've been looking at various span charts for decks and I'm still not quite sure how to calculate it all when you take into account not just the joists, but the beams and posts as well. What we ...
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2answers
103 views

NEC Breaker Selection for Motor Loads

In the case of motor loads connected to a long branch circuit, why does NEC Table 430.52 limit selection of an over current protection device (OCPD) to a smaller size than the branch conductor will ...
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2answers
142 views

Are all of these wirings code-acceptable for 3-way switching overhead lights?

So, i have a single switch by the garage door controlling the overhead lights like so: and i would like to add a switch by the other door (shown) and wire it for 3-way control of the lights. I'm ...
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2answers
47 views

What conduit should I install underground that meets code?

I want to run a conduit under my front yard about 20 feet. I will be trenching to 18 inches deep, but was curious what the easiest conduit is to install that meets code? PVC? EMT? Liquidtight?
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1answer
141 views

Can one of the (two or more) required 20A circuits for kitchen receptacles also serve a Dishwasher? (California Code)

Does the California Electrical Code allow one of the two required 20A circuits powering the wall / floor receptacles to also power a dishwasher? Bonus question: If not, and the dishwasher requires ...
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3answers
425 views

Electrical receptacle inside kitchen cupboard? (California code)

Is an electrical receptacle allowed inside a kitchen cupboard by the California Electrical Code? (i.e. installed so that the receptacle face plate is on the inside back panel of the the cupboard, so ...
2
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2answers
275 views

Is there a way to extend electrical wire where the splices can be finished over? [duplicate]

I want to extend some wires to relocate some switches. Normally one might do this by splicing new wires in and covering the junction box with a cover plate. Is there a way to permanently splice wires ...
3
votes
1answer
86 views

Cat6/Low Voltage Termination in a wooden enclosure

I have been bouncing around the idea of running CAT6 thru my older (1970s) house. Single story with an unfinished attic I have identified a bedroom closet as the potential location for the central ...
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1answer
178 views

How deep are gas lines and electrical lines under ground (to code)?

Before I start, I know I should always call Diggers Hotline (or comparable service depending on where you live) to have them mark all under ground gas & electrical lines. At what depth ...
0
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1answer
67 views

Running extension cord and Cat6a through wood closet shelf?

I'm in the process of installing a wireless router on a closet shelf, and I'd like to know the proper procedure for routing the extension cord and Cat6a cable. Per the picture below: The extension ...
1
vote
1answer
139 views

Is a plug adapter considered an “extension cord” under the NEC?

Is an adapter from a plug (say a NEMA 14-50) to a different socket (say a NEMA 6-20 or L14-20, or even a NEMA 6-50 for that matter) considered an extension cord by the 2014 NEC? If it isn't, then what ...
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0answers
135 views

Is it OK that my circuit breaker panel does not latch closed

I plan on doing some work and having it inspected. As part of the work I will be switching some normal breakers to AFCI. Before I get started I notice my panel does not fully latch closed. The latch ...
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1answer
78 views

Are 2x4 rafters legal in Connecticut? 13 ft runs

so I bought a REO house and about to redo the roof above the garage. I've noticed that I need to replace some rafters. However - I'm seeing that rafter are 2x4... Is that code-legal? p.s. by 13 ft ...
2
votes
1answer
70 views

Add drain line to existing Island fixture vent?

In CA, would code allow for a drain line to be tied into the vent line shown at the location of the red arrow below? Single family home. Happy to draw a picture of where that vent lines goes, if ...
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2answers
681 views

Is an explicit ground wire required through steel conduit?

We just bought a Chicago-area house and found that there's no ground wire in some of the recently re-wired areas. I thought that the national electrical code requires a ground wire for new ...
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1answer
61 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?
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2answers
576 views

Why is it OK to put multiple ground wires in the same bus hole in an electrical panel?

It's not clear to me why ground wires aren't subject to the same rules as neutral wires (one per bus bar hole). What's the reasoning here?
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4answers
120 views

How close to beam edge can I put light fixture nails?

I removed a 10-15 lb light from my ceiling. Beneath, the electrical box was at an odd angle: So I pulled that off as well, which revealed this hole. Those nail holes which were holding in the ...
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2answers
64 views

Is Black & Decker's “Codes for Homeowners” (3rd edition, 2015) a useful resource? [closed]

Is the Black & Decker "Codes for Homeowners" worth buying as a home improvement reference work?
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1answer
103 views

Adding ground to an existing conduit

Continuing my basement shop brainstorming... As I said in another question, the good news is that I've got a 30-amp 240V circuit more or less in the right place and available, and easily accessible ...
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1answer
266 views

Another code question: can I take a 110V outlet off one leg of a 220V circuit?

Wiring the workshop, it'd be simplest to use the 220V circuit to also supply the shop's 110V outlets. I know some machines/appliances do that internally; can I expose it on the wall? (I'm never sure ...
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2answers
168 views

Can a 220V US circuit have more than one 220V outlet, by code?

When I move the laundry, I'm considering switching to a gas drier -- but even so it'd be nice to have the 220V drop there for future-proofing. However, if I'm not using it for the drier, I'd like to ...
2
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1answer
445 views

does this look like an up to code support beam?

we had an entry way widened a bit which required them to install a longer support beam. I'm absolutely not a professional. But the 2x4's supporting the larger beam don't seem very substantial to me. ...
3
votes
2answers
411 views

What to do with the wires when removing baseboard heaters

I recently put in a forced-air whole house HVAC system in my old house. I'll be yanking the old electrical baseboard heaters from everywhere in the house soon. I'm wondering what all would be ...
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1answer
837 views

How many ceiling fans and switches can I put on one breaker [duplicate]

I have a person that wants to wire in four light boxes and four ceiling fans with switches and I need to know if I can run all four of them safely from one breaker and if so what kind of breaker? This ...
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0answers
84 views

basement bathtub straddling a crater

we got this house recently. i was working on paint and finishing our basement bathroom.. trying to remove the baseboard trim surrounding the the bathroom shower, i noticed that it came out ...
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2answers
110 views

Running LV conduit through attic - what do I need to know?

I want to run 1" LV conduit (Carlon Resi-gard) through the attic. Basically, I am using the attic for the "horizontal" run from one room to another. I will be sealing the hole with some caulking, ...
4
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2answers
154 views

Does conduit terminated in backless gang boxes defeat the purpose of fireblocking?

My understanding for an ENT conduit (other than for future flexibility) was that it was fire-rated, to reduce the spread of fire/air-flow between floors. If the conduit went through fire-blocks or ...
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0answers
168 views

Can I add an air gap to an existing drain pipe?

I am installing a water softener in my garage. There is already a place to connect into the water line (after the existing sediment filter), and there is an existing drain pipe (2 inch PVC that runs ...
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0answers
456 views

Can I make my bulkhead stairs steeper and still be up to code?

The bottom few steps of my bulkhead stairs go beyond the wall of the basement. The problem is I would like to put a door in my basement at the bottom of the stairs. To do this I would either have to ...
3
votes
2answers
293 views

Using fire retardant sealant for low-voltage cables through walls

I plan to wire my house with CAT6 cables, running inside the walls (drywall, wood). I would have to drill through the floor and probably through fire blocks in between the studs. Lot of guides advise ...
2
votes
1answer
161 views

When do galvanized pipes in NYC residential water delivery pipes need to be upgraded?

It was suggested that I ask here. Some residential properties in New York City still have galvanized pipes for the inlet water line. Since heavy metals from the galvanization can leach into the ...
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2answers
60 views

Help with fire code in a condo building

We had a "contractor" come out to bid our project and told me I needed to cut the drywall off one side of our living room wall. (We live on the 15th floor of a condo building in Minneapolis MN.) I did ...
4
votes
1answer
394 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
1answer
150 views

Should there be waterproofing between the rim joist and ledger on new construction?

My new house is being built with a deck and I noticed that the framer has fastened the ledger directly to the rim joist without any sort of waterproofing between. The sheathing which is Zip system ...
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0answers
78 views

Super-Insulating a Crawlspace

I am getting ready to have a contractor insulate my crawlspace. The exterior facing walls of my crawlspace are about 2" above grade, with the remaining 2 ft 6 in - 2 ft 10 in below grade. One of the ...
2
votes
1answer
342 views

Is a dryer vent tube being compressed like this up to code?

There's a 4" dryer pipe in my wall that is smashed slightly in order to get it to fit into the wall made with 2v4s. Is this OK?
6
votes
1answer
769 views

What is “code” and what should a DIYer know about it?

I've heard people who work in construction and here on this site discuss "code", and when this happens someone sites a specific document such as the National Electrical Code or International Plumbing ...
2
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1answer
374 views

Can I terminate my dryer vent next to my gas meter?

Background I want to move my electric dryer. This involves moving the exhaust vent. This question is about where I can safely terminate the vent duct on the exterior of my home. I already understand ...
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vote
1answer
109 views

Does a contract to build a deck need an occupancy clause?

I am replacing an exterior deck. I've had several contractors out to give quotes, accepted an estimate from one, and am now in the position of signing (or not) a contract for the work. It's a lump sum ...
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2answers
95 views

Is this a compliant way to control three circuits with two switches?

I'm planning to replace two dimmer switches -- but I found the following clever wiring when opening up the junction box. Three circuits where the neutral lines are spliced together, one live line ...
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1answer
60 views

Electrical Code Clarification

I'd liked to get some insights into how others interpret the code regarding AFCI and the NEC 2015 code. Here's a hypothetical: Arc fault protection is omitted for outlets outdoors, garages and crawl ...
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0answers
483 views

Deck diagonal bracing alternatives

The IRC prescriptive deck guide calls for decks taller than 6' to have diagonal bracing placed parallel (planar) to the beam from post to beam. My deck, which is built with a beam on one side and a ...