Extension cords must be sized properly to be able to safely carry the power needed by any electrical device. When it comes to stationary woodworking equipment, this is an especially important consideration.
The charts below show the minimum cord gauge for specific amp/voltage/length combinations common in woodworking.
Amp Rating
Volts
Cord Length in Feet
Minimum Cord Gauge
6-10
120
to 25
18 AWG
6-10
120
25-50
16 AWG
6-10
120
50-100
14 AWG
6-10
120
100-150
12 AWG
10-12
120
to 25
16 AWG
10-12
120
25-50
16 AWG
10-12
120
50-100
14 AWG
10-12
120
100-150
12 AWG
12-16
120
to 25
14 AWG
12-16
120
25-50
12 AWG
Extention cords over 50-feet in length are not commonly recommended for amp loads in the 12-16 or higher range.
6-10
240
to 50
18 AWG
6-10
240
50-100
16 AWG
6-10
240
100-200
14 AWG
6-10
240
200-300
12 AWG
10-12
240
to 50
16 AWG
10-12
240
50-100
16 AWG
10-12
240
100-200
14 AWG
10-12
240
200-300
12 AWG
12-16
240
to 50
14 AWG
12-16
240
50-100
12 AWG
240-Volt extention cables longer than 100-feet are not generally recommended.
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