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Old 01-29-2009, 05:11 AM   #1
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EMT Conduit


When can EMT conduit be used outdoors? I guess I always thought that it had to be fairly well protected from moisture, but I've noticed a lot of it run on outside walls, fences, etc. (commercial, professionally done work) where it's pretty much exposed to rain, sprinklers, etc.

Of course, I've also seen it run underground, but I assume NOT by a real electrician .

Gary

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Old 01-29-2009, 06:58 AM   #2
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EMT can be used outside using rain tight fittings where above ground and not subject to extreme physical damage. GRC is needed in that case and PVC underground.

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Old 01-29-2009, 11:41 AM   #3
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We get 7" of annual rainfal so anywhere outside/above ground is good here.
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Old 01-29-2009, 11:56 AM   #4
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Originally Posted by Bob Mariani View Post
................... GRC is needed in that case and PVC underground.
I Was not familiar with that acronym so I looked it up.
GRC is Galvanized Rigid Conduit
thanks

Also rigid is frequently run underground without transitioning to PVC.

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Old 01-29-2009, 12:00 PM   #5
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Quote:
Originally Posted by PaliBob View Post
I Was not familiar with that acronym so I looked it up.
GRC is Galvanized Rigid Conduit
thanks

Also rigid is frequently run underground without transitioning to PVC.

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Yes, but you should coat with a tar type paint for such uses. PVC is much better underground. Bur 12" minimum and cover with clean builder's sand.
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Old 01-29-2009, 12:39 PM   #6
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Yes, but you should coat with a tar type paint for such uses. PVC is much better underground. Bur 12" minimum and cover with clean builder's sand.
PVC needs to be buried at least 18 inches.
You can be at the 12 inch minimum, if it's residential, 120 volts or less, max overcurrent device is 20 amp, and if it is GFCI protected.

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