Recommended Minimum Wire Gauge for Extension Cords

RenTrain Use this handy chart to determine the best extension cord for your equipment. Recommended Minimum Wire Gauge for Extension Cords* Extension Cord Length Nameplate Amperes 25' 50' 75' 100' 150' 200' 0 -5 16 16 16 14 12 12 5.1 - 8 16 16 14 12 10 -- 8.1 -12 14 14 12 10 -- -- 12.1 - 15 12 12 10 10 -- -- 15.1 - 20 10 10 10 -- -- -- *Based on limiting the line voltage drop to five volts at 150% of the rated amperes. The smaller the gauge number of the wire, the greater the capacity of the cord. For example, a 14 gauge cord can carry a higher current than a 16 gauge cord. When using more than one extension cord to make up the total length, be sure each cord contains at least the minimum wire size required. If you are using one extension cord for more than one tool, add the nameplate amperes and use the sum to determine the required minimum wire size. Guidelines for Using Extension Cords If you are using an extension cord outdoors, be sure it is marked with the suffix "W-A" ("W" in Canada) to indicate that it is acceptable for outdoor use. Be sure your extension cord is properly wired and in good electrical condition. Always replace a damaged extension cord or have it repaired by a qualified person before using it. Protect your extension cords from sharp objects, excessive heat and damp or wet areas.