Continuous Flexing Cables for Motion Control
Simplified 90 °C Cable Sizing Guide for AC Induction Motors per NEC 430.250
Table for 90 °C cables with four conductors (3 phases plus ground):
Operating voltage 3Ø
Amp rating 90 °C
Metric size mm 2
AWG size
230V
460V
575V
18 16 14 12 10
1.0 1.5 2.5
14 18 25 30 40 55 75 95
See drive manual or NEC 430.22(G) See drive manual or NEC 430.22(G)
≤ 5HP (3.73 KW) ≤ 7.5 HP (5.6 KW) ≤ 10 HP (7.5 KW) ≤ 15 HP (11.2 KW) ≤ 20 HP (14.9 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) ≤ 75 HP (56 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) ≤ 75 HP (56 KW) ≤ 75 HP (56 KW) ≤ 100 HP (75 KW) ≤ 125 HP (93 KW) ≤ 150 HP (112 KW) ≤ 150 HP (112 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) ≤ 100 HP (75 KW) ≤ 100 HP (75 KW) ≤ 125 HP (93 KW) ≤ 150 HP (112 KW) ≤ 150 HP (112 KW) ≤ 200 HP (149 KW)
4 6
8 6 4 2 1
10 16 25 35 50
130 145 170 195 225 260
1/0 2/0 3/0 4/0
-
70 95
120
Table for 90 °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
11 14 20 24 32 44 60 76
See drive manual or NEC 430.22(G) See drive manual or NEC 430.22(G)
≤ 5HP (3.73 KW) ≤ 5HP (3.73 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) ≤ 30 HP (22.4 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) ≤ 40 HP (30 KW) ≤ 60 HP (45 KW) ≤ 60 HP (45 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) ≤ 75 HP (56 KW) ≤ 75 HP (56 KW)
4 6
8 6 4 2 1
10 16 25 35 50
104 116
Table for 90 °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
9.8
See drive manual or NEC 430.22(G) See drive manual or NEC 430.22(G)
12.6 17.5
≤ 3HP (2.24 KW) ≤ 5HP (3.73 KW) ≤ 7.5 HP (5.6 KW) ≤ 10 HP (7.5 KW) ≤ 15 HP (11.2 KW)
≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 15 HP (11.2 KW) ≤ 20 HP (14.9 KW) ≤ 30 HP (22.4 KW)
≤ 10 HP (7.5 KW) ≤ 10 HP (7.5 KW) ≤ 20 HP (14.9 KW) ≤ 25 HP (18.6 KW) ≤ 40 HP (30 KW))
4 6
21 28
8 6
10 16
38.5 52.5
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.
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