Ok now you had better figure out an accurate load for that same cable at 12 volts, or you are going to get yourself into a heap of trouble fast in our realm.
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Originally Posted by TigerElectrical
I suspect this job is complete but I thought I might be able to contribute since I'm an electrical contractor. Though there are other factors involved, generally speaking line voltage wiring is rated at 600 volts and the wire gauge determines the current rating in amps of that wire. Again in general, a 12 gauge copper wire is allowed to carry 20 amps. The formula for converting to watts would be 120 volts X 20 amps = 2400 watts x .8 = 1920 watts. The .8 multiplier is a derating factor that applies to a circuit that we would expect to run more than 3 hours which would certainly apply to lighting.