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    ixoye55's Avatar
    ixoye55 Posts: 2, Reputation: 1
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    #1

    Apr 10, 2014, 09:22 AM
    I am connecting to a 200 amp service panel and 300' to a 100 amp sub panel. #4 or #2
    I am connecting to a 200 amp service panel and running 300 ft to a 100 amp sub panel. At the 100 amp sub panel it will be running mostly lights and a occasional small appliance. Do I need to use #2 for the hot leads or can I get by with #4 ?
    donf's Avatar
    donf Posts: 5,679, Reputation: 582
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    #2

    Apr 10, 2014, 11:25 AM
    Before you start trenching, can your main service panel accept a 100 breaker?

    Next issue, if go from the main service panel to a downstream panelboard, you must use a 4 wire feed.

    Next, to deliver 240 volts - 100 amps a distance of 300' will require 2/0 AWG copper conductors. For Aluminum, you would need 4/0 conductors.

    That's allowing for a 3% Voltage drop. The recommended allowance is 5% end to end (feeder and branch circuit).
    ixoye55's Avatar
    ixoye55 Posts: 2, Reputation: 1
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    #3

    Apr 11, 2014, 05:58 AM
    Quote Originally Posted by donf View Post
    Before you start trenching, can your main service panel accept a 100 breaker?

    Next issue, if go from the main service panel to a downstream panelboard, you must use a 4 wire feed.

    Next, to deliver 240 volts - 100 amps a distance of 300' will require 2/0 AWG copper conductors. For Aluminum, you would need 4/0 conductors.

    That's allowing for a 3% Voltage drop. The recommended allowance is 5% end to end (feeder and branch circuit).
    Thanks
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