Using EMT as equipment grounding conductor

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Old 08-19-19, 03:13 PM
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Using EMT as equipment grounding conductor

Hi - I'm planning a project using EMT; in the past I've done projects using PVC conduit and this will be my first time using EMT. I plan to use the EMT to provide the EGC...a few questions:

1. How should the EMT be connected to the panel? Is the hardware used to attach the EMT to the panel sufficient?

2. The project will be run outdoors along fences around the backyard and will use metal boxes, weatherproof couplings and connectors, and maybe conduit bodies. Are there any issues with these items and assuring a continuous ground path?

3. I plan to bury a segment of the circuit and will use UF cable for that if I can get the 12" depth without too much trouble. I know that will require an EGC, can it just be attached to the ground screw in the box where the UF begins?

Thanks for your help!

-Eric
 
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Old 08-19-19, 03:44 PM
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When using EMT outside I highly recommend pulling a ground wire thru it.
Corrosion at boxes and fittings outdoors can comprise the ground.
 
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Old 08-19-19, 04:15 PM
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Hi, I generally pull a ground wire wire in all cases, but not required .
Geo
 
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Old 08-19-19, 04:23 PM
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Be aware that a buried circuit to be allowed to have only 12" of cover needs to be GFI protected and is limited to 20A @120V.
 
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Old 08-20-19, 05:12 AM
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(3) Yes, the ground wire connects to the box. The length of conduit that goes from the box into the ground down to the bottom of the trench has to be PVC. EMT can't be used in the ground.

I agree with the others that EMT is legal to use as the ground, but outdoors it's good practice to actually pull a ground wire due to corrosion. If this circuit powers anything in or around a body of water the ground wire is mandatory.
 
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