50 amp sub-panel


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Old 02-28-05, 01:29 PM
S
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50 amp sub-panel

How many 20amp circuits can be safely run off a sub-panel supplied from a main panelís 50amp breaker? The sub-panel will be supplying 4 or 5 basement lights a couple of outlets, a washing machine, a basement half bath, an island dishwasher, garbage disposal, compact microwave and warming drawer in a kitchen remodel, and another 20 amp circuit for a future upstairs bath. Will this be overloading this 50amp circuit?
 
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Old 02-28-05, 01:48 PM
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You can run as many circuits as you want, up to what the sub-panel will allow, space wise.

What is important is what you want to have on thoise circuits turned on at the same time.
 
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Old 02-28-05, 01:54 PM
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How many 20amp circuits can be safely run off a sub-panel supplied from a main panelís 50amp breaker?
42.

Will this be overloading this 50amp circuit?
Ah, much better question than your first question. A 50-amp 240-volt subpanel supplies up to 12KW of power. Let's do a ballpark calculation using conservative numbers:
  • 0.5 KW for the lights.
  • 1.0 KW for the two receptacles.
  • 1.0 KW for washing machine.
  • 2.0 KW for the basement half-bath.
  • 1.5 KW for the dishwasher.
  • 1.0 KW for the disposal.
  • 1.5 KW for the microwave.
  • 1.5 KW for the warming drawer.
  • 2.0 KW for the future bathroom.
You probably couldn't overload this is your turned on everything at once (which is so unlikely as to be not worth considering). Bottom line: you're okay.
 
 

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