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    fblankinship's Avatar
    fblankinship Posts: 12, Reputation: 1
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    #1

    Sep 18, 2009, 05:54 PM
    Can I use #2 Aluminum for a 100amp service
    Home Depot has wiring chart that says I can use #2 aluminum for a 100 amp underground service I am running, that just doesn't sound right, but I bought it, please let me know. The aluminum I bought is for direct bury but only has 3 conductors. I bought a single #2 aluminum it's alumaflex (TM) AA8176 TYPE USE -2 OR RHH OR RHW-2, IT'S 60 mils 600 volts. Can I bury this cable along with the 3 conductor cable I bought? It's for the ground.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
    Electrical & Lighting Expert
    		  
    #2

    Sep 18, 2009, 07:42 PM
    What exactly are you doing? Is this a main service or a sub-feed?
    fblankinship's Avatar
    fblankinship Posts: 12, Reputation: 1
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    #3

    Sep 19, 2009, 05:55 AM

    This is a 100 amp subpanel for my barn. It will be fed from a 200 amp main about 60 feet away. I am going to install a main disconnect on the subpanel along with a 100 amp breaker at the main. I was going to run the 3 wire direct bury cable I bought along with the #2 AL ground if I can. I will keep the ground and neutral separate at the panel and run a #4 solid copper ground attached to 2 ground rods separated about 7 feet.
    stanfortyman's Avatar
    stanfortyman Posts: 5,598, Reputation: 279
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    #4

    Sep 19, 2009, 09:01 AM
    That is fine then.
    Two things, you only need a #8cu or #6al ground and you only need a #6cu to the ground rods. Although, if you have everything already then what you have is OK, it's just a bit big.
    fblankinship's Avatar
    fblankinship Posts: 12, Reputation: 1
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    #5

    Sep 19, 2009, 10:40 AM

    Thanks, your always a big help
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