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Posted by carolyn on September 22, 2006, 6:03 am
SteveF wrote:
>
>> If the shop is considered residential use, #4 THWN conductors in 1-1/4"
>> conduit buried 2' deep will meet the NEC requirements.
>>
>> If the shop is to be used commercially, the minimum size wire would be #3
>> for a 100 amp subfeed. In either case, a #8 ground conductor should be
>> installed along with the feeder conductors.
>>
>> These are NEC recommendations, building codes in your area may be more
>> stringent.
>>
>> Ben
>>
>>
>
> Per NEC table 310.16 a copper #4 THWN is only rated for 85 amps and this
> is
> a 100 amp panel. And if this is commercial use (assume you mean
> "continuous load") then the cable should be rated for 120 amps and #3 is
> only rated for 100.
This will not be continuous load, however I may sell the odd piece. From
what I know, code is the minimum requirement. More is usually better - so
if #3 is only rated for 100 amps, then I will up it to give me some margin.
> And if the outbuilding is 300 feet away both those conductors are grossly
> undersized.
If I run the wire back and forth across the property, then I could us up
300'. If I do a straight run, it will be hard to use more than 20', not
including the drop into the ground and the climb back out at the other end.
> Carolyn - Since all the answers are slightly different, make sure you
> confirm everything you plan to do with your local electrical inspector.
> Even if you don't plan to get a permit you can still visit and tell them
> what you are planning to do so everything is done to code.
That I will do. I wanted to get an idea if I was heading in the right
direction, so that I can get a rough idea of the cost of the project. All
of the answers helped. Thanks!
> Steve.
--
Carolyn Marenger
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