Simplified 75 °C Cable Sizing Guide for AC Induction Motors per NEC 430.250
Table for 75 °C cables with four conductors (3 phases plus ground):
Operating voltage 3Ø
Amp rating 75 °C
Metric size mm 2
AWG size
230V
460V
575V
18 16 14 12 10
1.0 1.5 2.5
7 (NFPA 79 12.5.1) 10 (NFPA 79 12.5.1)
See drive manual or NEC 430.22(G) See drive manual or NEC 430.22(G)
20 25 35 50 65 85
≤ 5HP (3.73 KW) ≤ 5HP (3.73 KW) ≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 15 HP (11.2 KW) ≤ 25 HP (18.6 KW) ≤ 25 HP (18.6 KW) ≤ 40 HP (30 KW) ≤ 40 HP (30 KW) ≤ 50 HP (37 KW) ≤ 60 HP (45 KW) ≤ 60 HP (45 KW)
≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 20 HP (14.9 KW) ≤ 30 HP (22.4 KW) ≤ 40 HP (30 KW) ≤ 50 HP (37 KW) ≤ 60 HP (45 KW) ≤ 75 HP (56 KW) ≤ 75 HP (56 KW) ≤ 100 HP (75 KW) ≤ 125 HP (93 KW) ≤ 150 HP (112 KW)
≤ 10 HP (7.5 KW) ≤ 15 HP (11.2 KW) ≤ 25 HP (18.6 KW) ≤ 30 HP (22.4 KW) ≤ 50 HP (37 KW) ≤ 60 HP (45 KW) ≤ 75 HP (56 KW) ≤ 100 HP (75 KW) ≤ 100 HP (75 KW) ≤ 125 HP (93 KW) ≤ 150 HP (112 KW) ≤ 150 HP (112 KW)
4 6
8 6 4 2 1
10 16 25 35 50
115 130 150 175 200 230
1/0 2/0 3/0 4/0
-
70 95
120
Table for 75 °C cables with four conductors (3 phases plus ground) and one control pair (80% derated):
Operating voltage 3Ø
AWG size (power)
Metric size mm 2
Amp rating 75 °C
230V
460V
575V
18 16 14 12 10
1.0 1.5 2.5
7 (NFPA 79 12.5.1) 10 (NFPA 79 12.5.1)
See drive manual or NEC 430.22(G) See drive manual or NEC 430.22(G)
16 20 28 40 48 68 92
≤ 3HP (2.24 KW) ≤ 5HP (3.73 KW) ≤ 7.5 HP (5.6 KW) ≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 20 HP (14.9 KW) ≤ 25 HP (18.6 KW) ≤ 25 HP (18.6 KW)
≤ 7.5 HP (5.6 KW) ≤ 10 HP (7.5 KW) ≤ 15 HP (11.2 KW) ≤ 20 HP (14.9 KW) ≤ 30 HP (22.4 KW) ≤ 40 HP (30 KW) ≤ 50 HP (37 KW) ≤ 60 HP (45 KW)
≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 20 HP (14.9 KW) ≤ 30 HP (22.4 KW) ≤ 40 HP (30 KW) ≤ 50 HP (37 KW) ≤ 60 HP (45 KW) ≤ 75 HP (56 KW)
4 6
8 6 4 2 1
10 16 25 35 50
104
Table for 75 °C cables with four conductors (3 phases plus ground) and two control pairs (70% derated):
Operating voltage 3Ø
AWG size (power)
Metric size mm 2
Amp rating 75 °C
230V
460V
575V
18 16 14 12 10
1.0 1.5 2.5
7 (NFPA 79 12.5.1) 10 (NFPA 79 12.5.1)
See drive manual or NEC 430.22(G) See drive manual or NEC 430.22(G)
14
≤ 3HP (2.24 KW) ≤ 5HP (3.73 KW) ≤ 5HP (3.73 KW) ≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW)
≤ 7.5 HP (5.6 KW) ≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 20 HP (14.9 KW) ≤ 25 HP (18.6 KW)
≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 15 HP (11.2 KW) ≤ 25 HP (18.6 KW) ≤ 30 HP (22.4 KW)
4 6
17.5 24.5
8 6
10 16
35
45.5
Notes: Type of motor design is B. Class of Service and Duty-Cycle Service is continuous Copper conductors rated 75 °C, at ambient temperature between 26 and 30 °C Values are based on NEC 2020 430.250, power factor 1.25, ampacities are based on NEC 310.16, 75 °C Derating for control pairs based on NEC 310.15C Disclaimer: This is a simplified sizing guide, the final selection and sizing is the responsibility of the Authority Having Jurisdiction (AHJ) for the application. Please also refer to the drive manuals.
25
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