Single-Phase Motors, Wire/Raceway Chart
1. Volts
2a. Breaker
2b. Fuse
115
208
230
15A
15A
15A
10A
6A
6A
115
208
230
15A
15A
15A
10A
6A
6A
115
208
230
15-20A
15A
15A
15A
10A
6A
115
115
208
230
20-25A
20-25A
15A
15A
15-20A
15-20A
10A
10A
115
115
208
230
30-35A
30-35A
15-20A
20A
20-25A
20-25A
15A
15A
115
115
115
208
230
35-40A
35-40A
35-40A
20-25A
15-20A
25-30A
25-30A
25-30A
15A
15A
115
115
208
230
45-50A
45-50A
25-30A
20-25A
35A
35A
20A
15-20A
115
208
230
50-60A
30-35A
25-30A
40-45A
20-25A
20-25A
208
230
45-50A
40-45A
30-35A
30A
208
230
70-80A
60-70A
50-55A
45-50A
208
230
100-110A
90-100A
70-80A
70A
208
230
125-150A
110-125A
90-100A
80-90A
3. Wire
4. EGC
1/6 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
1/4 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
1/3 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
1/2 Horsepower
14 AWG
14 AWG
12 AWG
12 AWG
14 AWG
14 AWG
14 AWG
14 AWG
3/4 Horsepower
14 AWG
14 AWG
12 AWG
12 AWG
14 AWG
14 AWG
14 AWG
14 AWG
1 Horsepower
14 AWG
14 AWG
12 AWG
12 AWG
10 AWG
10 AWG
14 AWG
14 AWG
14 AWG
14 AWG
1 1/2 Horsepower
12 AWG
12 AWG
10 AWG
10 AWG
14 AWG
14 AWG
14 AWG
14 AWG
2 Horsepower
10 AWG
10 AWG
14 AWG
14 AWG
14 AWG
14 AWG
3 Horsepower
12 AWG
12 AWG
12 AWG
12 AWG
5 Horsepower
8 AWG
8 AWG
10 AWG
10 AWG
7 1/2 Horsepower
6 AWG
6 AWG
8 AWG
8 AWG
10 Horsepower
4 AWG
6 AWG
6 AWG
6 AWG
www.MikeHolt.com
5 Raceway
6. VD -Feet
7. FLC
1/2
1/2
1/2
208
690
833
4.4
2.4
2.2
1/2
1/2
1/2
158
518
632
5.8
3.2
2.9
1/2
1/2
1/2
127
414
509
7.2
4
3.6
1/2
1/2
1/2
1/2
93
149
307
374
9.8
9.8
5.4
4.9
1/2
1/2
1/2
1/2
66
105
218
266
13.8
13.8
7.6
6.9
1/2
1/2
1/2
1/2
1/2
57
91
145
188
229
16
16
16
8.8
8
1/2
1/2
1/2
1/2
73
116
151
183
20
20
11
10
3/4
1/2
1/2
96
126
153
24
13.2
12
1/2
1/2
141
171
18.7
17
3/4
1/2
216
165
30.8
28
3/4
3/4
240
184
44
40
1
3/4
306
234
55
50
Notes
1
2a
2b
3
4
5
6
7
Motor voltage rating
Inverse time breaker sized to 250% of FLC [Table 430.52 and 240.6(A)].
Dual-Element Fuse sized to 175% of FLC [Table 430.52 and 240.6(A)].
Conductor sized to 125% of FLC [430.22] 75ºC terminals [110.14(C)(1)(a)(3)], Table 310.15(B)(16).
Equipment grounding conductor [250.122(D)(1)].
Raceway sized to accommodate three full-size conductors at no more than 35% fill.
Distance of the circuit before voltage drops exceeds 5% of motor voltage rating. VD is not a NEC Requirement
Motor full-load current [Tables 430.248 single-phase and 430.250 three-phase].
Three-Phase Motors, Wire/Raceway Chart
1. Volts
2a. Breaker
2b. Fuse
208
230
460
15A
15A
15A
6A
6A
3A
208
230
460
15A
15A
15A
6A
6A
3A
208
230
460
15A
15A
15A
10A
10A
6A
208
230
460
15-20A
15A
15A
15A
15A
6A
208
230
460
15-20A
15-20A
15A
15A
15A
6A
208
230
460
25-30A
20-25A
15A
15-20A
15-20A
10A
208
230
460
40-45A
35-40A
15-20A
30A
25-30A
15A
208
230
460
60-70A
50-60A
25-30A
40-45A
35-40A
20A
208
230
460
70-80A
60-70A
30-35A
50-60A
50A
25A
208
230
460
110-125A
100-110A
50-60A
80A
70-80A
35-40A
208
230
460
125-150A
125-150A
60-70A
100-110A
90-100A
45-50A
208
230
460
175-200A
150-175A
80-90A
125-150A
110-125A
60A
3. Wire
4. EGC
1/2 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
3/4 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
1 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
1 1/2 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
2 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
3 Horsepower
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
14 AWG
5 Horsepower
12 AWG
12 AWG
14 AWG
14 AWG
14 AWG
14 AWG
7 1/2 Horsepower
10 AWG
10 AWG
10 AWG
10 AWG
14 AWG
14 AWG
10 Horsepower
8 AWG
8 AWG
10 AWG
10 AWG
14 AWG
14 AWG
15 Horsepower
6 AWG
6 AWG
6 AWG
6 AWG
10 AWG
10 AWG
20 Horsepower
4 AWG
6 AWG
4 AWG
6 AWG
10 AWG
10 AWG
25 Horsepower
3 AWG
6 AWG
4 AWG
6 AWG
8 AWG
8 AWG
www.MikeHolt.com
5 Raceway
6. VD -Feet
7. FLC
1/2
1/2
1/2
690
833
3331
2.4
2.2
1.1
1/2
1/2
1/2
473
572
2290
3.5
3.2
1.6
1/2
1/2
1/2
360
436
1745
4.6
4.2
2.1
1/2
1/2
1/2
251
305
1221
6.6
6
3
1/2
1/2
1/2
221
269
1078
7.5
6.8
3.4
1/2
1/2
1/2
156
191
763
10.6
9.6
4.8
1/2
1/2
1/2
158
121
482
16.7
15.2
7.6
1/2
1/2
1/2
173
210
333
24.2
22
11
3/4
1/2
1/2
216
165
262
30.8
28
14
1
1
1/2
229
278
441
46.2
42
21
1 1/4
1 1/4
1/2
283
345
343
59.4
54
27
1 1/4
1 1/4
3/4
284
274
433
74.8
68
34
Notes
1
2a
2b
3
4
5
6
7
Motor voltage rating
Inverse time breaker sized to 250% of FLC [Table 430.52 and 240.6(A)].
Dual-Element Fuse sized to 175% of FLC [Table 430.52 and 240.6(A)].
Conductor sized to 125% of FLC [430.22] 75ºC terminals [110.14(C)(1)(a)(3)], Table 310.15(B)(16).
Equipment grounding conductor [250.122(D)(1)].
Raceway sized to accommodate four full-size conductors at no more than 35% fill.
Distance of the circuit before voltage drops exceeds 5% of motor voltage rating. VD is not a NEC Requirement
Motor full-load current [Tables 430.248 single-phase and 430.250 three-phase].
Last updated: January 26, 2016