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kola 06-04-2008 08:20 PM

Running Underground wiring to shop 200Ft
 
Help? Planning on using 2-2-4 Alum URD. Any ideas how this will work? Have 200 amp panel in house Using 100watt Breaker panel in shop. Will have a3volt drop. Will use a 100 amp breaker in the house panel. The 3 wire is sold at the big box stores.If the4 wire should be used , i will hunt it down. Thanks for the help

HouseHelper 06-04-2008 09:38 PM

Two things: You need 2-2-2-4 Al, and you need to protect at 90A at the main panel.

J. V. 06-05-2008 03:15 PM

And separate neutrals and grounds in the new sub panel. You also need a breaker in the sub panel. One inside at the main panel and one in the sub panel. Househelper is correct about needing four wires for the sub panel feeder. 2 Hots - 1 Neutral - and 1 ground (EGC).
Breakers are not rated in watts typically. You need to look for the amp (current) rating on the breaker in the shop.
What is the sub panel rated at in amps? If it is 60 amp (example) you use a 60 amp or less in the sub, even though you have a 90 amp breaker protecting the feeder.
Good luck.

Cow 06-05-2008 06:09 PM

Quote:

Originally Posted by HouseHelper (Post 127952)
You need 2-2-2-4 Al.

Shouldn't you be asking him if he's under the 08 code before you tell him he needs 4 wires?

HouseHelper 06-05-2008 10:21 PM

Quote:

Originally Posted by Cow (Post 128168)
Shouldn't you be asking him if he's under the 08 code before you tell him he needs 4 wires?

No, 'cause I will always tell someone they need 4 wires for a subpanel, detached structure or not.

And Kola, remember you need to sink a ground rod or two at the shop also.

jrclen 06-06-2008 09:13 AM

I'd like to add that although you will need to use a 90 amp breaker in the main panel to protect your new feeder, it will be fine to use a 100 amp main breaker panel in the shop.


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