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Continuous Load

Posted: Fri Jan 11, 2019 4:51 am
by Elena Bertolotti
Hi everyone,

I would like to know what is the max. current in Amps you can officially get from a socket-outlet in a house/apartment in the US in continuous load (8 to 10 hours). With 120V, 208V and 240V.
Thank you very much for your help.
Best,

Elena

Re: Continuous Load

Posted: Fri Jan 11, 2019 8:41 am
by Aaron
As far as I know the safe calculation is 80% of the P = A x V formula, where P is watts, A is amps, and V is volts. This 20% deduction safely takes into account the resistance of wiring, splices, terminations, plugs, receptacles, etc.

So for example a 120V circuit at 15 amps, you have P = 15 x 120, or P = 1800 watts max peak.
So 80% of 1800 watts is 1440 watts continuous.

Re: Continuous Load

Posted: Fri Jan 11, 2019 11:05 am
by emtnut
Elena Bertolotti wrote:
Fri Jan 11, 2019 4:51 am
I would like to know what is the max. current in Amps you can officially get from a socket-outlet in a house/apartment in the US in continuous load (8 to 10 hours). With 120V, 208V and 240V.
Ditto on what Aaron said.

Most general use receptacles are 120V either 15 or 20A. I'm curious why you asked about 208 and 240V as well ???

Re: Continuous Load

Posted: Tue Jan 15, 2019 9:18 am
by Elena Bertolotti
Thank you very much.
I asked about 208V and 240V, because I know that some private houses can have this voltage.

Do you know if the same calculation is also for public infrastructures valid?
Thanks

Elena

Re: Continuous Load

Posted: Tue Jan 15, 2019 10:02 am
by emtnut
There is either 240V, or 208V in pretty much every residence.
Only special use receptacles/equipment use it though.

If you let us know what you are trying to do/learn, we could be much more helpful !
Your questions are rather vague / generic