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#40440 - 07/20/04 04:01 AM 3 wire sub panel
derater Offline
Member

Registered: 03/30/02
Posts: 182
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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#40441 - 07/20/04 06:02 AM Re: 3 wire sub panel
watthead Offline
Member

Registered: 10/13/01
Posts: 182
Loc: 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.

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#40442 - 07/20/04 12:00 PM Re: 3 wire sub panel
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: 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
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#40443 - 07/20/04 01:19 PM Re: 3 wire sub panel
derater Offline
Member

Registered: 03/30/02
Posts: 182
s'what I thought - many thanks

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