Quote:
Originally Posted by cleeds
Not necessarily, and that was my point. If you're connected to a 240VAC 30A circuit, there's no way to simultaneously fully power two 120V 20A circuits - to say nothing of yet another single 120V 10 amp circuit. (And remember, there is some inherent loss of power in the Equi-Tech transformer itself, because of heat.) That's why the design of the Equi-Tech just doesn't make sense to me.
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2 * 20 amp 120 volt circuits is only 4,800 watts or only 2/3rds of the 7,200 watt potential provided by the 240 volts, 30 amp input.
A simpler way to look at this is, a 2-phase 240 volt 30 amp circuit
is actually TWO * 120 volt 30 amp circuits (each leg of the 2-phase circuit is a single phase 120 volt 30 amp circuit). Since 2 * 120 volt @ 30 amps has 1/3rd more current potential than 2 * 120 volt @ 20 amps,
your statement above does NOT make sense (unless there is over 1/3rd loss).
Cleed, please show me where the MATH does NOT work. If you notice, there is already 1,200 watts of room provided for "inherent loss" of all 3 combined circuits.
Here are the calculations again:
amps * volts = watts
240 volts * 30 amps = 7,200 watts (maximum input into the isolation transformer)
120 volts * 20 amps * 2 = 4,800 watts (maximum outputs 1 & 2)
120 volts * 10 amps = 1,200 watts (maximum output 3)
(4,800 + 1,200 watts) = 6,000 watts < 7,200 watts (Note: 3 * 120 volts * 20 amps = 7,200 watts, but Equi=Tech probably designed in a safety margin)