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firefighterolse · Apr 18, 2009, 10:16 AM

How many watts on a 20 amp circuit

Perito · Apr 18, 2009, 10:27 AM

If it's a 120 volt circuit, the number of watts is

$Watts\,=\,Volts\,x\,Amps\,=\,120*20 = 2400$

If it's a 240 volt circuit, it's

$Watts\,=\,Volts\,x\,Amps\,=\,240*20 = 4800$

Of course, those are maximums and, strictly speaking, it only applies to resistive loads.

Stratmando · Apr 18, 2009, 04:18 PM

If a continious load(more than 3 hours) derate to %80. 2400 X .8 = 1920 Watts(16 Amps)

stanfortyman · Apr 18, 2009, 05:07 PM

You have to remember, the definition of a continuous load is a load that is expected to be on for three hours or more, NOT a load that is possible to be on for three hours or more.