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Posted by carolyn on September 22, 2006, 6:16 am
Jonny wrote:
>>I am thinking of setting up a shop in an outbuilding, and want to put a
>> panel in the outbuilding. Currently there is a single line running a
>> couple of outlets and a light in the building. For the shop, I want a
>> 240v
>> for my table saw, and then 120v outlets for the drill press, and assorted
>> other tools, radiant heater, and dust collection system. I will be
>> replacing the house's 100amp panel with a 200amp, and will reinstall the
>> 100amp in the out building. What gauge wire do I need to run between the
>> two panels? I will be putting it in a trench with a metal conduit. I am
>> guessing that a 2' deep conduit should be sufficient. Does that sound
>> about right?
>>
>> Thanks, Carolyn
>> --
>> Carolyn Marenger
>>
>
> Check your local municipality for depth of the trench requirement. If not
> applicable, and if you have rock/gravel consistency mostly in the soil,
> lack
> of settling, you'll probably be okay at 2 feet depth. I would bottom and
> top the conduit with a couple inches of sand as a buffer from rocks,
> before
> burying. Heavy equipment, trucks and automobiles driving over this trench
> may compact excessively if in a shallow trench at 2 feet if the soil is
> generally soft. Run deeper in that case. Some municipalities in my
> region require 6 feet in depth as an example.
I will check. The area is known for the crops of rocks that are in
everyones gardens. Generally I would consider it hard, so it would make
sense to cushion it with some sand. Thanks for the suggestion.
> You never indicated a circuit breaker to feed from the 200 amp panel to
> the 100 amp panel, or, pulling both phases from the 200 amp panel bus
> directly (not advised).
I would run it through a circuit breaker feed on the 200 amp panel. Just in
case I needed an easy shut off from the house.
> Local building code should provide the information you seek on wire gauge
> (AWG). The wire material (aluminum or copper) and distance you route this
> wire between the panel and termination, determines the wire gauge.
Thanks, I will look it up before I get much further into the process.
> Most local municipalities base their electrical code upon the NEC. The
> applicable year of NEC publication that pertains depends on the
> legislation requirement.
> http://www.answers.com/topic/national-electrical-code
> http://www.stealth316.com/2-wire-resistance.htm
> The NEC was flaky on what the requirement is for the grounding conductor
> between two panels when there is a large distance separation. Bear in
> mind you're running both phases, not just one phase between the two
> panels.
Thanks. I will keep that in mind.
http://www.windsun.com/PDF/cc65.pdf#search=%22National%20Electrical%20Code%20NEC%20%22wire%20gauge%22%22
> Hire a licensed electrician. If you live in rural area, talk to your
> neighbors and see how they did
> things as well. You may see mistakes they made so you can avoid them. A
> standard trencher may work if the soil is soft, and lacks any substantial
> rocks. Otherwise, use a drivable rock saw. Looks like a small tractor
> with
> a big wheel with cutting teeth/spikes on the back. Also check where your
> plumbing and current electrical lines are buried before digging.
I will check before I dig, and I am running about 15 feet between buildings,
so a trencher may not even be able to get in the space.
Thanks,
Carolyn
--
Carolyn Marenger
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