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#31147 - 11/11/03 10:22 PM sub panel in seperate structure  
SCS  Offline
Junior Member
Joined: Nov 2003
Posts: 7
edison NJ
im installing a 100 amp sub in poll barn ,im using PVC and pulling wires .. do i need to pull a ground wire with my feeder conductors ,there will be 2 wires and a nuetral in pipe ,i know i have to drive an additional ground rod at the other building


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#31148 - 11/11/03 10:31 PM Re: sub panel in seperate structure  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
250.32 allows you to use the grounded conductor of the feeder circuit to attach to the grounding electrode of the seperate structure, if you do not pull an equipment grounding conductor.


Ryan Jackson,
Salt Lake City

#31149 - 11/11/03 10:32 PM Re: sub panel in seperate structure  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
Will there be any other conductive paths to the barn? (ie phone line or metalic water pipe etc...)

If so yes, and you would isolate the neutral from the EGC and the ground rod (GEC)connections.

Even if you are not going to have any other conductive paths right now, it is still the best way to do this. (plan for the future)

Roger


#31150 - 11/11/03 10:36 PM Re: sub panel in seperate structure  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
I should have also pointed to 250.32 as Ryan did.

Specificaly 250.32(B)

Roger


#31151 - 11/11/03 10:39 PM Re: sub panel in seperate structure  
SCS  Offline
Junior Member
Joined: Nov 2003
Posts: 7
edison NJ
so i should add the EGC
im running 1/0 copper what size should the EGC be ??


#31152 - 11/11/03 10:41 PM Re: sub panel in seperate structure  
SCS  Offline
Junior Member
Joined: Nov 2003
Posts: 7
edison NJ
did i say thank you for the fast reply ??


#31153 - 11/11/03 10:45 PM Re: sub panel in seperate structure  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
Your welcome.

If you decide to use an equipment ground, you cannot use the nuetral for attachment to the grounding electrode.

If you do not pull an equipment ground you may use the nuetral for attachment to the grounding elctrode.

Dealer's choice!


Ryan Jackson,
Salt Lake City

#31154 - 11/11/03 10:48 PM Re: sub panel in seperate structure  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
West Jordan, Utah, USA
I'm sorry i missed half of your question. REmember that EGC's are driven by the size of the breaker, not the size of the conductor. 250.122 tells me that #8 is fine.


Ryan Jackson,
Salt Lake City

#31155 - 11/11/03 10:51 PM Re: sub panel in seperate structure  
SCS  Offline
Junior Member
Joined: Nov 2003
Posts: 7
edison NJ
thanks guys


#31156 - 11/11/03 11:03 PM Re: sub panel in seperate structure  
Roger  Offline
Member
Joined: May 2002
Posts: 1,716
N.C.
SCS, Welcome to the forum.

I personaly would install the EGC.

Roger


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