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Residential Wiring - The Right Way!

Wiring Information for the Do It Yourself Homeowner

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Thread: sub panel

  1. #1
    Join Date
    Jan 2015
    Posts
    1

    Lightbulb sub panel

    Needing to expand for more lighting and I would like to set a sub-panel. The old panel is 100 amp what breaker size should I use to feed the sub-panel ??
    Thanks

  2. #2
    Join Date
    Jan 2015
    Posts
    1

    Default

    What is the amount of watts you are going to be using? Divide the watts by 125 volts and that will be the minimum amperage to feed the sub panel. If I were going to the trouble of putting in a sub-panel I would probably go with at least 40 amps.

  3. #3
    Join Date
    Feb 2012
    Location
    Kent, WA
    Posts
    216

    Default

    I would also do a 120/240V panel (so use something like 6-3 or 8-3 cable with ground). In that case you'd be dividing your watts by 240 instead of 120. For residential, you also don't figure lighting or general use receptacles by watts but by square footage ( 3 watts per square foot). But once you have a panel, it tends to get used for other things that draw more power. If you want to ever run a water heater, clothes dryer, or electric range, then you're going to need something larger than a 40A or 50A feeder to this panel. Costs also start going up once you get past the 60A level.
    Mark
    Kent, WA

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