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#40440 07/20/04 06:01 AM
Joined: Mar 2002
Posts: 179
derater Offline OP
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?

#40441 07/20/04 08:02 AM
Joined: Oct 2001
Posts: 172
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.

#40442 07/20/04 02:00 PM
Joined: Jan 2003
Posts: 4,391
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
#40443 07/20/04 03:19 PM
Joined: Mar 2002
Posts: 179
derater Offline OP
s'what I thought - many thanks

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