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    chuckysan's Avatar
    chuckysan Posts: 1, Reputation: 1
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    #1

    Jul 2, 2007, 05:20 PM
    Wire size for sub panel
    Hi, :)
    We are converting a garage into a guest house, with permits, and I have a few questions on the electrical side.
    I have tried to search for my questions, but need more info. Plans are to place a 100 amp sub-panel 250 feet from main panel. Will # 2 in 2 inch conduit be enough, how much voltage loss? Will it take 3 #2's and 1 #6 if size is correct? How many circuits can I have with a 100 amp panel? I plan on running an air conditioning unit and some appliances, lights and outlets from this panel. How many circuits can run off a 100 amp panel?
    Off my main panel I have an existing 60 amp breaker not in use, I need to run 20 feet of wire for a 50 amp connection for a RV, what size wire should I use?

    Thanks in advance
    Chuck
    Washington1's Avatar
    Washington1 Posts: 798, Reputation: 36
    Senior Member
    		  
    #2

    Jul 2, 2007, 08:26 PM
    Hi,
    We are converting a garage into a guest house, with permits, and I have a few questions on the electrical side.
    Assuming this is a detached garage.

    I have tried to search for my questions, but need more info. Plans are to place a 100 amp sub-panel 250 feet from main panel. Will # 2 in 2 inch conduit be enough, how much voltage loss?
    Not for that distance. I recommend 3/0 3/0 2/0 (good for 250 feet) in 2" RNC Sch 40, but you may be able to get by with 2/0 2/0 1/0 in 2" RNC sch 40. I believe the 2/0 is pushing it, but that's me. You will also want to run a #8 (Note: As of today, some jurisdictions do not require 4 conductors. Check with the authority having jurisdiction).

    How many circuits can I have with a 100 amp panel? I plan on running an air conditioning unit and some appliances, lights and outlets from this panel. How many circuits can run off a 100 amp panel?
    It's the demand that matters. I recommend doing a demand load calculation before proceeding.
    Yet, a 100amp service should be able to supply up to 24 branch circuits.

    Off my main panel I have an existing 60 amp breaker not in use, I need to run 20 feet of wire for a 50 amp connection for a RV, what size wire should I use?
    How do you plan to run your wire? Example: In conduit

    If you plan to run the wire using NM-B, then a 6-3 will have to be used
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