Requirements for Ground Conductor in Motor Applications

Following is a list of requirements for ground conductors in motor circuits. This information is based on UL requirements. Please consult NEC and local codes for further requirements.

Requirements for Ground Conductor in Motor Applications


AMP RATING OF MOTOR (FLA) COPPER WIRE RANGE FOR GROUND
FROM TO FROM TO
3.76 5 12AWG 14AWG
5.1 7.5 10AWG 14AWG
7.6 10 10AWG 12AWG
10.1 15 10AWG 10AWG
15.1 25 8AWG 10AWG
25.1 50 6AWG 8AWG
50.1 75 4AWG 6AWG
75.1 100 3AWG 6AWG
100.1 125 2AWG 4AWG
125.1 150 1AWG 4AWG
150.1 200 1AWG 3AWG
200.1 250 1\0 2AWG
250.1 266.6 1\0 1AWG
266.7 300 2\0 1AWG
300.1 333.3 2\0 1\0
333.4 400 3\0 1\0
400.1 500 3\0 2\0
500.1 533.3 3\0 3\0
533.4 600 250MCM 3\0
600.1 666.6 250MCM 4\0
666.7 800 350MCM 4\0
800.1 833.3 350MCM 250MCM
833.4 1000 400MCM 250MCM
1000.1 1250 500MCM 350MCM
1250.1 1333.3 500MCM 400MCM
1333.4 1500 700MCM 400MCM




Notes:
#1. These values are for educational purposes only.
Due to the wide range of circuit applications, the author assumes no responsibility for the application of these values.


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