Check out any of the hobby electronics stores or the best store "Google"
http://www.science-city.com/3vdcminibuzzer.html
It's the amps that are controlled by the breaker not the volts. You can have a 600 volt 15 amp breaker, you can have a 347 volt 15 amp breaker. The breaker will trip when you exceed 15 AMPS.
15 amp
What size breakers are needed for a 30kva transformer 208 volt feed 600 volt out put
It will probably be fine, but there is always a danger if you exceed specs. If it were me, I would give it a try.
A 15 amp 125 volt outlet is a household outlet.
No, you need to supply the correct 18V to your speakers.
It's the amps that are controlled by the breaker not the volts. You can have a 600 volt 15 amp breaker, you can have a 347 volt 15 amp breaker. The breaker will trip when you exceed 15 AMPS.
None.
No. At 125 volts, the same 15 amp current results in 10 times as much power. Ohm's Law states that amps x volts = power.
15 amp
A #1 copper conductor will limit the voltage drop to 3% when supplying 15 amps for 700 feet on a 120 volt system.
In North America you would need two 15 amp breakers to obtain 240 volts. The wire for a 15 amp circuit would be #14 AWG. So to answer the question, yes a 240 volt receptacle can go on a 15 amp circuit.
What size breakers are needed for a 30kva transformer 208 volt feed 600 volt out put
It will probably be fine, but there is always a danger if you exceed specs. If it were me, I would give it a try.
4 volt