Originally posted by bullheimer
oh yeah, just one small note to everybody. when using an extention cord, if you leave any of it coiled up, IT WILL CUT THE AMPACITY OF THE WIRE so always unroll it as much as possible when using something with a big load, like your welder
Dah! Come on. Not the transformer theory. You should see how many miles of sealtight flex are coiled up under computer floors. You don't loose anything worth talking about.
Originally posted by 302/Z28
It is common NEC (National Electrical Code) practice to protect #10 AWG wire with a 30 amp fuse or breaker, #12 is 20 amp, #14 is 15 amp. These figures can vary slightly depending on the wire type and installation., but as a general rule these figures are good
It is also standard engineering practice to size wire at 125% of full load. At 19.5 amps with 4/C #10, you are way under the max load....start welding.
That is out of 310-16, but you have to use the correction factor for more than three current carrying conductors in 310-15(b)(2)(a), which is 80%. You are still okay at #10.