Alex Rubenstein <alex@corp.nac.net> writes:
But my point remains. Appliance/load wire size is often, and many times smaller than the ampacity of the circuit.
Heck, how many times have you plugged in a 14 gauge extension cord to a 5-20R?
I do this all the time. In (all our) defense, lamp cord is the closest thing to conductors in free air that most people will ever run into, and although the insulation isn't high temperature stuff, the heat buildup isn't the same as a few dozen THHN conductors in EMT. If you want something that will make your head explode a little (until you think it through and realize that "ampacity" is just another way of expressing "i^2r losses plus dissipation rate), read NEC table 630.11(A), and then 630.12(A) and noodle on just how skinny a wire you can use for hooking up a (home, low duty cycle) welder that's breakered at 50 amps. 12 AWG anyone? -r