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Old 02-01-2011, 09:47 AM   #1
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Default direct burial of THWN

Would you or have you direct buried THWN Cu for use as a GEC or EGC? I personally don't see a problem although technically it would be a violation of the code since it's not listed for the purpose. But what could happen? The insulation could degrade to the point of leakage of fault current in the event of a fault? Uh oh! Those bare copper direct buried EGCs are in trouble too I guess

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Old 02-01-2011, 09:55 AM   #2
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I would, I have, I will.

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Old 02-01-2011, 09:57 AM   #3
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I would, I have, I will.
Same here.
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Old 02-01-2011, 10:01 AM   #4
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As an GEC, yes. ECG, no.
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Old 02-01-2011, 10:11 AM   #5
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As an GEC, yes. ECG, no.

Why not on the EGC?
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Old 02-01-2011, 10:21 AM   #6
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Why not on the EGC?

For what reason would I need to bury an EGC?
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Old 02-01-2011, 10:24 AM   #7
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I have installed THWN direct buried for a GEC many times in the past and would not hesitate to do it again.

I don't see anything in 250.62 that would prohibit using THWN for a GEC.

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Old 02-01-2011, 10:30 AM   #8
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For what reason would I need to bury an EGC?

A direct burial circuit to something that has metal parts that may become energized. Any feeder needs one run with it.
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Old 02-01-2011, 10:37 AM   #9
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A direct burial circuit to something that has metal parts that may become energized. Any feeder needs one run with it.
Yeah, but it needs to be grouped inside the conduit if its thwn...300.3b....but it does say same trench...i wonder whatthat would entail...
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Old 02-01-2011, 10:44 AM   #10
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Yeah, but it needs to be grouped inside the conduit if its thwn...300.3b....but it does say same trench...i wonder whatthat would entail...

I'm saying THHN/THWN for the EGC only. If it's a direct burial the rest of the circuit conductors would be USE insulated
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Old 02-01-2011, 10:45 AM   #11
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I'm saying THHN/THWN for the EGC only. If it's a direct burial the rest of the circuit conductors would be USE insulated
Im not sure what you are saying.
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Old 02-01-2011, 10:52 AM   #12
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I think he us saying that you could run triplex URD or similar and add the EGC as THWN.
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Old 02-01-2011, 10:53 AM   #13
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Quote:
Originally Posted by Electron_Sam78

I'm saying THHN/THWN for the EGC only. If it's a direct burial the rest of the circuit conductors would be USE insulated
Huhhhh???
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Old 02-01-2011, 11:00 AM   #14
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I think he us saying that you could run triplex URD or similar and add the EGC as THWN.
I did not know you can do that...
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Old 02-01-2011, 11:07 AM   #15
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A direct burial circuit (branch, feeder) with USE rated individual conductors or a triplex URD whatever you like -not really the point of this thread. However I propose using THHN/THWN for the EGC. Though technically not code compliant I think due to the UL listing of the insulation, what's the worst that could happen? The insulation could degrade but that's no big deal since direct buried EGCs can be bare copper anyway.
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Old 02-01-2011, 11:11 AM   #16
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I cannot recall any time where I needed to direct-bury an EGC. It's either part of the cable (UF) or pulled in with the circuit conductors (PVC).

I've buried separate EGCs along with triplex URD, but it's the same XLPE as the URD, not THWN.
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Old 02-01-2011, 11:29 AM   #17
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I cannot recall any time where I needed to direct-bury an EGC. It's either part of the cable (UF) or pulled in with the circuit conductors (PVC).

I've buried separate EGCs along with triplex URD, but it's the same XLPE as the URD, not THWN.
ok I'll check you off as a definite "have not"
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Old 02-01-2011, 12:06 PM   #18
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ok I'll check you off as a definite "have not"

I think I've already stated that.
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Old 02-01-2011, 02:23 PM   #19
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I think I've already stated that.
I noticed once I went to check the box and it was already checked. Mom was right too much television does rot your brain~!

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