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Why Extension-Cord Gauge Matters

A thicker extension cord has lower electrical resistance, which matters more as the cord gets longer or the load gets heavier. The gauge number works backward: 12 AWG is heavier than 14 AWG, and 14 AWG is heavier than 16 AWG.

For lamps and small loads, a light cord may be perfectly adequate. For heaters, large tools, or long runs, heavier cable reduces voltage drop and unnecessary heating.