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To ground, or not to ground,... that,..is my qwery #163205 05/03/07 08:22 PM
Joined: Dec 2003
Posts: 524
Attic Rat Offline OP
Member
... Hi gang, I'm planning on running a 60 amp, 240 volt, single phase feeder out to a detached garage to a sub-panel...my question is... do I need a ground rod out there, or will the bare grounding wire in the SER cable suffice?? I'm using 1-1/4" pvc pipe to go underground, but if I don't use SER, and just pull THHN,..does the grounding conductor then have to be insulated??

Thanx....


.."if it ain't fixed,don't break it...call a Licensed Electrician"
Work Gear for Electricians and the Trades
Re: To ground, or not to ground,... that,..is my q [Re: Attic Rat] #163208 05/03/07 10:19 PM
Joined: Mar 2005
Posts: 212
G
Gregtaylor Offline
Member
Can't quote chapterand verse since I don;t have the book right here, but if you are feeding a panel in a seperate building it must be seperately grounded and since you will be using PVC as a raceway you don't need to pull a ground wire at all. Why would you even consider SER in a raceway?

Re: To ground, or not to ground,... that,..is my q [Re: Gregtaylor] #163209 05/03/07 10:32 PM
Joined: Jan 2005
Posts: 5,316
renosteinke Offline
Cat Servant
Member
Feeder, separate building ... need a ground rod.

Whatever method you use, I recommend treating it as a 'sub-panel.' That means having a ground wire back to the main panel, and keeping the neutrals and grounds apart.

Re: To ground, or not to ground,... that,..is my qwery [Re: Attic Rat] #163210 05/03/07 11:31 PM
Joined: Mar 2005
Posts: 212
G
Gregtaylor Offline
Member
While I agree with Reno's interpretation of this issue, around here the inspectors consider a ground wire with the feeder and a seperate ground rod or two to be parallel grounding.

Re: To ground, or not to ground,... that,..is my qwery [Re: Gregtaylor] #163212 05/03/07 11:40 PM
Joined: Jul 2004
Posts: 9,569
G
gfretwell Offline
Member
If you didn't rebond the neutral in the far panel your inspectors would be wrong. In fact, in 2008 250.32(B)(2) will be gone and you will be required to run a 4 wire feeder.


Greg Fretwell
Re: To ground, or not to ground,... that,..is my qwery [Re: Attic Rat] #163213 05/03/07 11:59 PM
Joined: Aug 2006
Posts: 356
Niko Offline
Member
250.32 (A) and 250.32(B)(1)(2)
I don't think insulated or not will make a difference on the EGC. I would run an EGC and install a separate ground rod and bond the EGC to it, however, I do not bond the grounded conductor to the grounding bar.

Edward


Be kind to your neighbor, he knows where you live

Re: To ground, or not to ground,... that,..is my qwery [Re: Niko] #163217 05/04/07 05:10 AM
Joined: Nov 2005
Posts: 31
J
jdo1942 Offline
Junior Member
There is apparently many ideas on how to to this, but the current code is that you run a four feeder and use an insulated ground wire once you leave the main building and go into the ground. And you separate the ground bar and neutral. In our area the the AHJ will tell you to remove the ground rod, paralell path.

Re: To ground, or not to ground,... that,..is my q [Re: jdo1942] #163218 05/04/07 05:37 AM
Joined: Apr 2001
Posts: 449
F
Fred Offline
Member
You must install a grounding electrode at the structure served! How in the world do these AHJs get around 250.32(A)? An AHJ who makes you remove a ground rod from a structure served by a feeder needs to be re-educated.

Re: To ground, or not to ground,... that,..is my qwery [Re: Attic Rat] #163220 05/04/07 05:43 AM
Joined: May 2007
Posts: 3
R
RonS Offline
New Member
I recently fed a detached garage in our area. The local AHJ requires a four-wire feed in addition to two (that's right - two!) 8' ground rods - 6' apart with a #4 copper conductor. The garage is 10' from the house which also has two ground rods in addition to the cold water bond also a #4. That gives me 4 ground rods in a 25' radius plus the cold water bond. All #4.

Re: To ground, or not to ground,... that,..is my qwery [Re: Attic Rat] #163227 05/04/07 08:51 AM
Joined: Sep 2006
Posts: 58
Y
yanici Offline
Member
I'm too lazy to open the book. I believe the egc is necessary if there is any metallic connection to the main structure, such as water pipe , gas, etc. The ground rod IS REQUIRED even if an egc is pulled in.

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