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detached building (again) sorry #88294 05/27/04 02:09 PM
Joined: Apr 2002
Posts: 178
R
Reel-Break Offline OP
Member
OK ,I have a 200amp service residential.I have a out building/workshop with a 100 amp main breaker panel installed. Now can I run 3 wire service to it?Bond neutral to can.
Do I place a rod there or not?
Do I run 4 wire and place rod?
I re read some past threads but need alittle
reassurance.Thanks in advance.
using direct burial cable pvc conduit.

2017 / 2014 NEC & Related Books and Study Guides
Re: detached building (again) sorry #88295 05/27/04 03:44 PM
Joined: Aug 2003
Posts: 1,374
R
Ryan_J Offline
Moderator
Are there any continuos metal paths between the building? Such as water pipe, gas, coax, phone, etc...?


Ryan Jackson,
Salt Lake City
Re: detached building (again) sorry #88296 05/27/04 04:35 PM
Joined: Apr 2002
Posts: 178
R
Reel-Break Offline OP
Member
Not that I`m aware of at this time.I read 250.32 Not clear on the single branch part.Electricians here say you can run three wire but the best way would be go with 4 wire and the rod.Just would like to better understand if three wire is permisable in this situation legally. But also personally I`m lean towards the best way if it is better.

Re: detached building (again) sorry #88297 05/27/04 05:04 PM
Joined: Apr 2003
Posts: 139
B
BPHgravity Offline
Member
If your installing a panelboard at the workshop, than you don't have a single branch circuit going to the workshop, you have a feeder.

Regardless if you wire with 3-wire or 4-wire, a grounding electrode system will be required at the workshop building.

I don't think either way can be classified as "better". Both will provide adequate service and practical safegaurding.


Bryan P. Holland, ECO.
Secretary - IAEI Florida Chapter
Re: detached building (again) sorry #88298 06/10/04 05:34 PM
Joined: Apr 2002
Posts: 189
T
triple Offline
Member
Take a course on stray voltage and you will find out why the 4-wire method IS better than using only 3.

If you are not sure of metallic paths then you MUST use 4-wire.

Ground rod(s) are necessary at the second building.


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