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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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What is required clearance from mechanical exhaust to garage door?

I'm looking to add a new tankless water heater, which allows for pvc exhaust. In California, USA, I think clearance requirements for a door is four feet horizontally or one foot vertically. Does this ...
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1answer
75 views

Some odd wiring in my breaker box. Is this up to code?

I'm poking around in my breaker box and I notice a white wire screwed into the ground bus. Tracing it back, both bare and white are on the ground bus and the black is screwed into a breaker. Is this ...
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1answer
30 views

Is there a building code for shower tile? (CA)

The folks at Lowe's told me not to place tile on top of tile, but it seems like the shower in the home I just bought has 2 layers of tiles. Is there a code for that? Or just a "suggestion" not to have ...
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1answer
39 views

What is the stainless steel baseboard in a walk-in cooler/freezer?

Trying to identify this base molding that I want to match in a walk-in cooler at a supermarket. It is missing from a few sections of the cooler and needs to be installed. Is this anything special, ...
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1answer
56 views

How can I mount a one gang box to a pipe?

I would like to mount a single gang box to a pipe and stay code compliant. I have a 1-1/2" pipe (but that can be changed), and I would like to have an outlet on the side of the pipe for mounting a ...
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1answer
40 views

NEC 210.70 and old wall sconces

I'm planning a diy rewiring of my 1914 2 story. All the upstairs bedrooms (3) have wall sconces with small switches in the fixtures. These sconces are the only light fixtures in the room. The ...
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2answers
66 views

Staying electric code compliant while cleaning up in-wall network box

Below is a pic of the in-wall network box in my new home - it is a 42" On-Q metal box, with an existing power outlet inside. Not shown are the bundle of cat5e cables and network and phone switches I ...
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2answers
103 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 ...
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1answer
55 views

Are louvered bedroom doors allowed by code?

I'd like to build new rail and stile type interior bedroom doors with slats installed in the panel openings. This would be for improved air flow. This story on ABC ("Closing your bedroom door at night ...
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3answers
60 views

Ganged Circuit Breaker has strange ganging configuration. 40-[30-30]-40

I have a scenario where the Circuit Breakers for a Dryer and a Range are intertwined in the CB panel. In the picture below 17 and 20 are ganged together with that wild ganging clip. 18 and 19 both ...
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2answers
54 views

Required protection for copper gas line passing through metal opening in fireplace casing (Alberta, Canada)

Background context: As executor, I'm in the process of selling my late father's house. I have an offer pending; following the home inspection, the prospective buyers have submitted a list of ...
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0answers
41 views

Waterproofing outdoor wire splices and receptacles

It seems that the NEC requires wire splices to be UL486D listed when used in outdoor (generally damp or wet) locations, similar to the requirement for THWN or other wet-rated wiring. Why are special ...
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1answer
68 views

Is it within code to run ent conduit into a junction box on the exterior of the home?

I am in the construction process for a new home. I asked the Low Voltage Contractor to run conduit to about 13 places inside the house. In addition to that I asked for a run to the exterior of the ...
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1answer
58 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 ...
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1answer
113 views

Do I need to protect all wiring in an attic when adding a permanent ladder?

I am wanting to add a permanent attic ladder to create storage space in a big attic. There is already exposed wiring in a few places in the attic. If I add a permanent ladder, does that then mean that ...
2
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1answer
63 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 ...
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3answers
70 views

Can I splice the common wire of two different circuits in the same junction?

I have a single 4way run that shares a 2 gang box with another circuit. Both circuits run off of the same sub-panel. Is phase an issue here? I can't seem to find anything that indicates whether or ...
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1answer
76 views

Is any depth change allowed on electrical panel wall?

I know the NEC requires clear space in front of a breaker panel. What depth of wall change would violate this? My basement, where the panel is, has a 6" jut where the block wall becomes timber. So ...
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1answer
68 views

Are these joists to code?

I am resurfacing my deck and have applied for a county permit to do the work (therefore it will be inspected). I have a protrusion at my house to support a chimney. The size of the protrusion is ...
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2answers
49 views

Am I allowed to put a wall standard within 18" of a fire sprinkler?

From my understanding, in San Francisco, CA, there is a code requirement that you cannot obstruct an area within 18 inches of a fire sprinkler. What is meant by obstruction? Say, you installed one of ...
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2answers
47 views

Does the NEC regulate data cable bury depth?

Technically my jurisdiction follows the 2016 California Electric Code, but it's mostly just the 2016 NEC. Table 300.5 lists bury depths for various areas and wiring methods. Do these apply to data ...
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1answer
40 views

How do I couple IMC underground?

The title, more or less, sums it up. I plan to bury some THHN/THWN-2 feeders, and my jurisdiction allows a 6" bury depth if I use IMC or RMC. I plan to use IMC, which comes with both a male and female ...
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0answers
29 views

What is the correct type of anchor bolt for attaching a sill plate to a slab once the concrete is dry?

If you need to install additional anchor bolts after the concrete has cured (and thus can no longer install traditional J bolts), what is the correct type of fastener that can be installed into dry ...
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4answers
84 views

Gas-fired water heater safe to have in living area of home?

A un-licensed renovation on our house was performed about 15 years ago, which turned a former garage into a 200 sq ft den directly attached to the rest of the house. In this den is a gas-fired water ...
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3answers
100 views

Is a Garage considered a 'Dwelling' for standalone electric service?

I just wrapped up adding new overhead 100 amp service for my parent's garage outside Chicago. My Mom is a retired ceramics teacher and wanted a 30A two phase kiln and/or welder in there and the ...
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1answer
37 views

Can I carve a portion out of the side of a floor joist to accommodate a Fernco Clamp

I am tying a pvc sanitary tee into a 3" copper DWV line which runs along a floor joist (2x12) in the ceiling of my basement. I plan on using a fernco shielded coupler 3007-33 (https://www.fernco.com/...
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1answer
83 views

Do you need a special type of screw to mount a NEMA 3R box?

I need to mount a NEMA 3R Meter base and panel on a temp pole. There are screw knockouts on the back of the panels, but is there something that needs to be done to stop water from coming in the screw ...
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1answer
66 views

Suggestion installing receptacles on basement wall?

I plan to install four 20 amp duplex receptacles on a basement concrete wall in area marked by red rectangle (see picture). Along the top of wall is a plumbing drain pipe. Suggestions for installing ...
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3answers
152 views

Suggestions for properly mounting 4' shop light

Suggestions for installing two 4 ft LED flush mount shop lights in unfinished basement ceiling perpendicular to floor joists (see pictures)? Specifically, what ceiling box to use and would you mount ...
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4answers
210 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 ...
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2answers
66 views

Upgrading electrical when re-doing siding & code question

I'm thinking about re-siding a house within a next year or two. It is 2-unit house, 3 floors. The third floor outlets do not have ground. Can electric wires be ran under the siding? Is this common and/...
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1answer
83 views

Bring portable generator in through automatic transfer switch

I currently have a portable generator, an inlet, and an interlock on the main panel to backfeed the panel. I am moving over to an automatic transfer switch with a standby generator. However, as a ...
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3answers
299 views

Is a dedicated circuit to gas furnace always required?

USA NEC 2014. Is there any way to dodge the requirement for a dedicated circuit for a gas furnace? I need to hang one more small hardwired load right near the furnace, and would rather not run a ...
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0answers
30 views

Can I open a bulkhead open to two unfinished spaces with a finished space between?

I have crawlspace on two sides of a finished den, with the den sandwiched between them. Can I finish a bulkhead through the den but open to the crawlspace on both sides to simplify utility passage ...
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1answer
168 views

Bathroom Layout - Code Questions

I have a half bath that is 5' 2" x 7' 3" (measured from drywall to drywall) that I'm hoping to add a shower to. I know that it will be tight, and I'm ok with that, but I'm trying to figure out if I ...
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3answers
422 views

Are splices required in a junction box?

If I have a conduit with 6 wires (3 separate circuits), and I want them to split at some point, can I send the conduit (A) to a 4-inch square junction box and then send 2 wires to leave the junction ...
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0answers
51 views

Is there minimum clearance from gas stove to door?

I know there is a minimum clearance to hood and cabinets above, but I can't find a side-clearance to a doorway. My concern is someone coming through the door and not seeing the hot stove around the ...
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1answer
47 views

How to connect 5-15P plug into 6-20R receptacle?

I have a computer power supply (PSU), input voltage is 120-240V, I assume I can safely plug it into a 240V outlet. I have one those outlets in my garage, problem is that it is 6-20R type receptable ...
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0answers
20 views

What base support is required for 4“x4”x6'H posts to hold 2, 5'W x 6'H vinyl privacy panels on wooddeck

Removing span of 10'W x 3'H rail (has 3 existing 4"x4" posts; 2 ends, 1 centered) on deck and replacing with a vinyl privacy wall. New wall will have two 5'W x6'H panels hanging on three 4"x4"x6'H ...
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1answer
41 views

What is the service wire sizing based off of on a temporay power pole?

I know how to use the wire sizing tables, but I'm unclear on how to size wire before a breaker, and when the panel has no main breaker. For example, If I have a temp power service panel that is rated ...
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0answers
40 views

When do you use an aluminum vs PVC service entrace cap (weatherhead)?

When installing an overhead power service entrance, you can choose between metal conduit with a metal weather-head, or PVC conduit with a PVC weather-head. Is this 100% a matter of preference, or are ...
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2answers
50 views

How are multiple switches in “or” setup functional?

I've come across a light controlled by three switches. It's unique to me because any combination of switches must be in the "on" position for it to work. All three must be "off" for the light to go ...
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0answers
36 views

Attic access in closet- reconfigure options (Canada)

I have a narrow bathroom and this is because the builtin closet of the adjacent room takes space from the bathroom. I am planning to remove the walls that separate the bathroom from the closet in ...
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2answers
48 views

Are Ideal Greenie 30-192P Ground Wire Nuts approved for use with stranded wire?

I looked at page 4 of the UL document here: http://www.idealindustries.ca/media/pdfs/products/ideal_ul_listed_combinations.pdf And I notice that it says you can use up to 4 #12 wires. However, it ...
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2answers
151 views

What is the correct material to sheath pex pipe under a slab?

It's recommended in my area (due to rocky soil) to install a sheath or channel under the slab for the pour, then slide the PEX into the sheathes afterwards during the rough. This also allows the PEX ...
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0answers
28 views

Can I seal nonmetallic electrical conduit penetration in firewall with intumescent caulk?

It appears like I can simply use the appropriate thickness of intumescent caulk if I penetrate a firewall (garage wall) with EMT. Can I do the same if I'm using nonmetallic or must I use collars in ...
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0answers
44 views

Non-metallic conduit support spacing problem

I'm running a length of 1/2" PVC conduit along my basement wall for a generator hookup. From the inlet, I was planning to run it under the stairs and mount it to the wall from either side; the space ...
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2answers
91 views

How can I move the neutral-ground bond to my house from the pole?

Suppose I have a setup like this: I take my power at a pole. The utility wants me to fit circuit protection there for a very long run to my house. By my read of things, this makes it a main panel ...
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1answer
98 views

Can I wire a receptacle to a cord and plug?

I am planning to add a recessed wall box for my TV so I can put the connections behind its wall mount. Most of these boxes come with a pass-through of some sort as well as a spot for a single-gang ...
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4answers
96 views

What are the IRC requirments for bracing/blocking in a load-bearing 2x6 stud wall that is 12' high?

When building an exterior load bearing wall 12' high, using 2x6's, is there horizontal blocking/bracing required between the studs? If so, what are the requirements for that? ie. how many per cavity, ...