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The current (amp) capability is determined by the wire size in gauge, rather than the voltage rating stamped on the insulation.

The most basic rating is 20 Amps for 12 gauge and 15 Amps for 14 gauge wire; however, it can get more complex than that for long runs of wire or for wires run through conduit with other wires. Hire an electrician if this sounds bewildering.

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