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02-01-2011, 09:47 AM
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#1
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Senior Member
Join Date: Feb 2010
Location: Florida
Posts: 167
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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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02-01-2011, 09:55 AM
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#2
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Senior Member
Join Date: Mar 2008
Location: Central Fl
Posts: 1,259
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I would, I have, I will.
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The Following User Says Thank You to Podagrower For This Useful Post:
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02-01-2011, 09:57 AM
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#3
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Moderator
Join Date: Jan 2007
Location: NY State
Posts: 7,512
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Quote:
Originally Posted by Podagrower
I would, I have, I will.
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Same here.
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02-01-2011, 10:01 AM
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#4
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,289
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As an GEC, yes. ECG, no.
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In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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02-01-2011, 10:11 AM
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#5
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Senior Member
Join Date: Feb 2010
Location: Florida
Posts: 167
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Quote:
Originally Posted by 480sparky
As an GEC, yes. ECG, no.
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Why not on the EGC?
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02-01-2011, 10:21 AM
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#6
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,289
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Quote:
Originally Posted by Electron_Sam78
Why not on the EGC?
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For what reason would I need to bury an EGC?
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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02-01-2011, 10:24 AM
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#7
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Ax grinder
Join Date: Jan 2007
Location: North Logan, Utah
Posts: 1,898
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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.
Chris
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02-01-2011, 10:30 AM
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#8
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Senior Member
Join Date: Feb 2010
Location: Florida
Posts: 167
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Quote:
Originally Posted by 480sparky
For what reason would I need to bury an EGC?
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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.
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02-01-2011, 10:37 AM
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#9
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child please.....
Join Date: Oct 2008
Location: Hack City, USA aka New Orleans
Posts: 5,267
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Quote:
Originally Posted by Electron_Sam78
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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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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REMOVED
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02-01-2011, 10:44 AM
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#10
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Senior Member
Join Date: Feb 2010
Location: Florida
Posts: 167
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Quote:
Originally Posted by NolaTigaBait
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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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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02-01-2011, 10:45 AM
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#11
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child please.....
Join Date: Oct 2008
Location: Hack City, USA aka New Orleans
Posts: 5,267
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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
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Im not sure what you are saying.
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02-01-2011, 10:52 AM
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#12
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Registered Member
Join Date: Feb 2008
Location: Atlanta, Ga/Hamilton, Al
Posts: 4,868
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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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02-01-2011, 10:53 AM
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#13
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Senior Member
Join Date: Jan 2009
Location: Pittsburgh, PA
Posts: 1,118
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Quote:
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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
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Huhhhh???
__________________
Its not just a job, it's a career!!!
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02-01-2011, 11:00 AM
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#14
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child please.....
Join Date: Oct 2008
Location: Hack City, USA aka New Orleans
Posts: 5,267
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Quote:
Originally Posted by InPhase277
I think he us saying that you could run triplex URD or similar and add the EGC as THWN.
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I did not know you can do that...
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02-01-2011, 11:07 AM
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#15
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Senior Member
Join Date: Feb 2010
Location: Florida
Posts: 167
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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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02-01-2011, 11:11 AM
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#16
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,289
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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.
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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02-01-2011, 11:29 AM
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#17
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Senior Member
Join Date: Feb 2010
Location: Florida
Posts: 167
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Quote:
Originally Posted by 480sparky
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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ok I'll check you off as a definite "have not" 
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02-01-2011, 12:06 PM
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#18
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Chief Electron Relocator
Join Date: Sep 2007
Location: Cornpatch USA
Posts: 31,289
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Quote:
Originally Posted by Electron_Sam78
ok I'll check you off as a definite "have not" |
I think I've already stated that. 
__________________
In winter, why do we try to keep the house as warm as it was in summer when we complained about the heat?
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02-01-2011, 02:23 PM
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#19
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Senior Member
Join Date: Feb 2010
Location: Florida
Posts: 167
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Quote:
Originally Posted by 480sparky
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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