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12/3 SO is a moderately heavy duty portable electrical cord. To parse the number: 12 ga, 3 conductor, type SO jacket. This cord would typically be rated for 20A. It contains the hot, neutral, and ground conductors, individually insulated, within a single common jacket. The type SO jacket is an oil resistant rubber or neoprene type material.

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Q: What is a 12-3 so cord?
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