Motor Wiring Chart

This chart is only for reference. Always use the motor label if available. Also refer to NEC and NFPA electrical Codes.

HP
FLA
Nema Size
SqD Heater Size
AB Overload Size
Circuit Breaker Size
Wire Size
Conduit Size
1
2.1
NEMA 1
B 3.00
W36
3
#12
3/4
1.5
3
NEMA 1
B 4.15
W40
7
#12
3/4
2
3.4
NEMA 1
B 4.85
W42
7
#12
3/4
3
4.8
NEMA 1
B 6.90
W45
7
#12
3/4
5
7.6
NEMA 1
B 11.5
W50
15
#12
3/4
7.5
11
NEMA 1
B 17.5
W54
15
#10
3/4
10
14
NEMA 1
B 25.0
W56
30
#10
3/4
15
21
NEMA 2
B 32.0
W61
50
#10
3/4
20
27
NEMA 2
B 45.0
W64
50
#6
1 1/4
25
34
NEMA 2
B 62.0
W67
70
#6
1 1/4
30
40
NEMA 3
CC 59.4
W67
100
#4
1 1/4
40
52
NEMA 3
CC 81.5
W69
100
#4
1 1/4
50
65
NEMA 3
CC 103.0
W72
100
#2
1 1/2
60
77
NEMA 4
CC 112.0
W74
150
#2
1 1/2
75
96
NEMA 4
CC 156.0
W77
150
2/0
2
100
124
NEMA 4
CC 196.0
W36
200
4/0
2 1/2
125
156
NEMA 5
B3.70
W38
250
4/0
2 1/2
150
180
NEMA 5
B4.15
W40
400
4/0
2 1/2
200
240
NEMA 5
B6.25
W43
600
350kcmil
2 1/2
250
302
NEMA 6
B 3.00
W36
700
500kcmil
3
300
361
NEMA 6
B 3.70
W37
800
700kcmil
3 1/2
350
414
NEMA 6
B 4.15
W38
1000
1000kcmil
4
400
477
NEMA 6
B 5.50
W40
1200
1500kcmil
6