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Old 06-04-2008, 08:20 PM   #1
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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


Last edited by kola; 06-05-2008 at 07:13 PM.
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Old 06-04-2008, 09:38 PM   #2
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Running Underground wiring to shop 200Ft


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

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Old 06-05-2008, 03:15 PM   #3
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Running Underground wiring to shop 200Ft


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.
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Old 06-05-2008, 06:09 PM   #4
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Running Underground wiring to shop 200Ft


Quote:
Originally Posted by HouseHelper View Post
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?
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Old 06-05-2008, 10:21 PM   #5
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Running Underground wiring to shop 200Ft


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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.
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Old 06-06-2008, 09:13 AM   #6
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Running Underground wiring to shop 200Ft


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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