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  1. #11
    Join Date
    Jun 2007
    Location
    Fayette County, Ohio
    Posts
    5,789

    Default Re: Small Subpanel Replacement

    10/3 would work. That is a 30 amp load center that I linked you to.

    Jack
    Be sure you live your life, because you are a long time dead.-Scottish Proverb

  2. #12
    Join Date
    May 2008
    Location
    Pacific Northwet
    Posts
    1,577

    Default Re: Small Subpanel Replacement

    Old thread, so I'm probably way too late to the party.

    Quote Originally Posted by MyMilan View Post
    I'm going to run some new wire to the subpanel when I install it. There is not much of a load in the garage. The lighting consists of 5 LED lights (at 9 watts each) and two 15 amp receptacles. The attic has 3 LED lights @ 8 watts each. That is it. Running 8/3 should be more than enough correct?
    For the load you describe, 10/3 as a 30A/240V service would be plenty adequate. But if you ever want to run heavier power tools (like an air compressor) you might want to go with a little heavier service (8/3 as 40A/240V). An air compressor starting up when you're running some other power tool could cause the circuit breaker feeding the garage to trip.

    You might never need the extra capacity, but having it could be a selling point when you're ready to move on. And if you ever imagine using an industrial-sized welder, you'll probably want at least 60A service.

    If it's more than a couple hundred cable-feet (one-way distance) from the main panel in the house, you might want to upsize your wire to prevent voltage drop. If the no-load voltage is 123V, putting 30A of load at the end of a 200-foot run of 10/3 will drag the voltage down to 111V.

    Calculate voltage drop here: http://www.calculator.net/voltage-drop-calculator.html
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

  3. #13
    Join Date
    Jan 2014
    Location
    El Paso, TX
    Posts
    34

    Default Re: Small Subpanel Replacement

    For your lighting load as described 14/2 on a 15 amp breaker will be enough.

    For your entire panel 10/3 on a 30 amp breaker will be enough. If you add more receptacle circuits or believe you might expand in the future then you might consider 8/3 on a 40 amp breaker. If cost is not important then 8/3 might be the way to go.
    Last edited by John freeman; 10-14-2014 at 04:33 PM.

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