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Questions tagged [emt]

24 questions
15
votes
5 answers

How do you mount conduit to a wall so that it stands off a standard box distance?

I'm running 1/2" EMT conduit between single-gang surface-mount boxes. The holes for the boxes are slightly set away from the wall so that the conduit does not mount flush against the wall. I have found various types of single screw and double screw…
KJ7LNW
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12
votes
3 answers

Can I use a hose clamp to ground a wire to EMT?

Question: What are the rules for how to attach a wire to an already grounded EMT conduit? Can I use stainless steel host clamp and tighten down? Background: I was installing a metal box for a light switch in our attic and had to terminate existing …
KJ7LNW
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6
votes
1 answer

Is there an advantage to using EMT over Plastic Flexible Conduit for Low Voltage runs?

I am planning a structured wiring project. As AV wiring is always changing, I think it would be pertinent to run the low voltage wire in conduit. While discussing the idea with a friend (and hardware store salesmen), he told me that in his personal…
Elliott
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6
votes
1 answer

Do I need conduit inside the wall when transitioning EMT from outdoor to inside garage?

When bringing EMT run from outside to inside (THHN wires), do the wires just hang in the air from one conduit body (sitting outside) to the other conduit body (sitting inside the garage)? Or do I need to insert a 4" piece of conduit inside the wall…
user168213
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5
votes
1 answer

Sub Panel/EMT Grounding Questions

looking for some clarity on sub-panel/EMT grounding. Been doing some research but not fully clear on some things. Going to feed a sub-panel/loadcenter from a 60A breaker installed in a 200A main panel (no main breaker in sub-panel), using ACWU 4/3…
JBS
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4
votes
1 answer

Do I really need to run so many parallel EMTs?

NEC gives max number of conductors for certain EMT conduit. For example, it’s 16x12AWG for a 3/4” conduit. Now it turns out this is really not the limiting factor at all. It is de-rating. Suppose I have 20A circuits (with 12AWG wiring) and I want to…
divB
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4
votes
1 answer

Securing NM cable when entering box with protective EMT sleeve

Please be patient folks, this is the first time I've tried asking a question here :-) I use full conduit wiring (usually 3/4" EMT) for new stuff in my shop/garage areas. The new stuff sometimes has to connect to NM cable wiring. I usually formally…
tekrefugee
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4
votes
1 answer

Is this the right grounding bushing for EMT? Am I using it wrong?

I was introduced to grounding bushings in this answer to a previous question of mine, but couldn't actually find them anywhere for weeks. Finally I bought this one off Amazon, and it arrived this week! When I tried to use it in a Tesla charger…
peter
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4
votes
1 answer

Weatherproof junction box has two types of holes/ports - what connector is compatible with each?

I've got some weatherproof outdoor junction boxes and am trying to figure out what type of connector is compatible with each hole/port. Below is a photo of a sample weatherproof box with two deep threaded "hubs(?)" on top and one on the bottom, and…
Armand
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3
votes
0 answers

Does NEC 2023 require conduit mounting hardware to be listed?

I only have the NEC 2020 edition on hand, but from what I'm reading on 358.6 for EMT listing requirements: EMT, factory elbows, and associated fittings shall be listed I think it's safe to assume parts around supporting the conduit do not need to…
contrapsych
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3
votes
2 answers

How to terminate EMT into a panel in a bay extension

Suppose I'm running some wire in EMT into the side of an electric panel, and the electric panel is flush mounted into a dedicated stud bay extension / bump out. Here's a sample photo with a panel that's only 2-3" out, where the rest of the big hole…
peter
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3
votes
3 answers

Does adding an explicit ground wire to EMT conduits provide any advantages?

I am well aware that NEC allows the EMT conduit to be used as grounding conductor. In my home, there is no dedicated grounding wire through the EMTs. I know this is fine. When I recently got HP/HPWH installed, the electrician added a dedicated…
divB
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1
vote
1 answer

How much length does an EMT compression connector add to end of segment?

I'm doing a small unfinished garage wall project installing some steel junction boxes and 3/4 and/or 1/2 inch EMT between them. Looks like the EMT compression connectors to the boxes (see screencap for example only) will slightly extend the length…
Armand
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1
vote
2 answers

Can old EMT conduit be used as a grounding path when it is from an era that did not use grounds?

NEC 358.60 Grounding: EMT shall be permitted as an equipment grounding conductor. I have some old EMT from an era before grounding was common. I need a grounding connection at one end of it and there is no other good ground to use (all nearby…
volcanosandwich
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1
vote
2 answers

water condensation inside electrical conduit running on attic

Today my TP Link Kasa smart switch started acting strange (turning on and off randomly) - it is broken now. When I hit reset button, a few drops of water dropped out. I removed the plate, pulled the switch out and noticed water inside. I am in…
Arek
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