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Re: Wire Gauge sizes
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Posted by Gerad J. on September 30, 2004 at 19:18:57 from (67.0.108.20):
In Reply to: Wire Gauge sizes posted by JD Jim A. on September 29, 2004 at 19:27:34:
By National Electrical Code definition, #14 wire is rated at 15 amps. That is based on the heat generated in that wire by that current. And very long tradition. Some high temperature insulations could survive 20 amps or more, but the rule is 15 amps for #14. At 12 volts, you might want to keep the load down to 10 amps on that 10 foot run, else the voltage drop will be excessive and the lights a bit dim. Remember that a lamp draws about 15 times the rated operating current initially, so 15 amps of lamps are going to try to draw 225 amps. You need relays and switches rated for that tungsten surge or they will be fried rapidly. The ONLY time a wire is too fat is when it won't go in the connections at the ends. A fat wire saves electrical energy (at the cost of fuel to move it around on the tractor, truck, car, and airplane). Gerald J.
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