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3 wire sub panel #40440
07/20/04 06:01 AM
07/20/04 06:01 AM
derater  Offline OP
Joined: Mar 2002
Posts: 179
Cust.,who is also a builder I work for, wants a sub panel in detached garage via the 3 wire he alresdy has; should I drive a ground rod there?

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Re: 3 wire sub panel #40441
07/20/04 08:02 AM
07/20/04 08:02 AM
watthead  Offline
Joined: Oct 2001
Posts: 172
South Carolina
Yes, but you should only use the three wire method if there is, and will be, no other metallic paths between the two structures. This includes metal water or gas pipe, telephone or other wires. If you have no other metal connection you should drive a rod or two per requirements, and bond to neutral like service equipment.

Re: 3 wire sub panel #40442
07/20/04 02:00 PM
07/20/04 02:00 PM
iwire  Offline
Joined: Jan 2003
Posts: 4,391
North Attleboro, MA USA
Great advice from Watthead, the code section that you need to read would be 250.32(B)(2)

Also no matter if you run a separate EGC or not out to a detached building you must connect grounding electrodes to the panel grounding bar.


Bob Badger
Construction & Maintenance Electrician
Re: 3 wire sub panel #40443
07/20/04 03:19 PM
07/20/04 03:19 PM
derater  Offline OP
Joined: Mar 2002
Posts: 179
s'what I thought - many thanks


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