In a message dated 10/19/2005 4:14:03 P.M. Eastern Standard Time,
amps080605@w4zt.com writes:
If we use your factual example of 2300 watts OUTPUT, then using 60%
efficiency will give us 3833 watts input power, add a few amp pieces for
another 100 watts for 3933 watts. Use 90% efficiency for the power
supply and you've got 4370 watts. That's 18.21 amps at 240 volts. Add a
blower at an amp and you're up to 19.21 amps. #14 wire on a 15 amp
circuit wouldn't be the right choice for your example. Actually, neither
would #12 on a 20 amp circuit. Drop the mains voltage, change the tap in
your power supply to maintain your B+ and your mains current is even higher.
I don't refute what you have said here, however, it does NOT change the
fact that the Ameritron AL-1500 comes with a 15A 240 plug and 15A fuses. On
SSB or Cw this amp will perform just fine on a 20A circuit with #12 wire. The
amp is NOT a continuous load and therefore no derating factor need be taken
into consideration. 18 amps on #12 wire with a non continuous load is fine.
The reason for the circuit breaker is to protect the circuit for an overload.
If the wire gets too hot the breaker will trip. Just for example, an
electrical stove/oven is usually fed with #6 wire rated for 50 amps. If you
have
ever hooked one up, you will see that they use either #12 or #10 wire at the
terminals you just hooked your #6 to. Insulation is another factor in wire
rating.
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