10 copper wire will hold 30 amps /we use this size wire for electrical dryers.
http://wiki.answers.com/Q/How_many_amps_will_10_ga...

16 Gauge wires can carry between 3 and 25 amperes depending on the length of
http://www.chacha.com/question/howmanyampscan1...

your breakers in your house are 15 amps and 20 amps for duplex recepticles in your house.to be safe use a cord rated for 15amps.then ohms law is amps x volts = watts.so 15 x 120 volt
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Ok three feet to a switch is 1.5 to and 1.5 back, 3 feet to and back is 6 feet, if this is just a switch in series to the fuse, no issues, 6 wire will hold 30 amps constant
http://en.allexperts.com/q/ElectricalWiringHome...
