VFD Cable Selection Guide

VFD Cable Selection Guide

Cable Properties

Ampacity
NEC Art. 310-16, 90°C
Four Conductors (3 Black with white numbers + G/Y ground)

AWG	Amps (3/c + Grid)	AWG	Amps (3/c + Grid)
22	6*	10	40
20	8*	8	55
18	14	6	75
16	18	4	95
14	25	3	110
12	30	2	130

*not from NEC table (Calculated)

Motor Properties

Four Conductors (3 Black with white numbers + G/Y ground)
Selection (NEC Art. 430-22 exc. 2)
Wire size @125% of FLC (4/c cable)

Drive	230 V 3Ø	460 V 3Ø	575 V 3Ø	Drive	230 V 3Ø	460 V 3Ø	575 V 3Ø
HP	AWG	AWG	AWG	HP	AWG	AWG	AWG
1/4	22	n/a	n/a	10	10	16	18
1/3	22	n/a	n/a	15	8	12	14
1/2	22	22	22	20	6	10	12
3/4	22	22	22	25	4	8	10
1	20	22	22	30	3	8	10
1 1/2	20	22	22	40	2	6	8
2	18	20	20	50	**	4	6
3	18	20	20	60	**	3	4
5	14	18	18	75	**	2	3
7 1/2	12	16	18	100	**	**	2

Note: Above tables reference the suggested wire AWG to use based on Horse Power (HP) and FLC times 125% per NEC Art 430-22 exc. 2.
Amperes (FLC) were determined from NEC Art. 430-150: Full-Load Current for Three Phase AC Motors.
For Example: For a 5 HP and 460 Volt motor, the FLC is 7.6A. 7.6Ax125%=9.5A. The right AWG wire for 9.5A is 18 per NEC Art. 310-16, 90°C.
**Use single conductors
++ Use 4 Conductor Cable

Installation Properties

Voltage Drop Factors
Volts/ft at FLC at 20°C

HP	@ 230 V	@ 460 V	@ 575 V	HP	@ 230 V	@ 460 V	@ 575 V	HP	@ 230 V	@ 460 V	@ 575 V
1/2	.045	.022	.018	15	.034	.043	.053	125	.020*	.020*	.016*
3/4	.064	.032	.026	20	.028	.038	.047	150	.020*	.022*	.018*
1	.056	.042	.034	25	.020	.028	.036	200	.016*	.025*	.024*
1 1/2	.079	.060	.048	30	.020	.032	.042	250	n/a	.020*	.019*
2	.052	.045	.036	40	.021	.027	.033	300	n/a	.020*	.019*
3	.073	.063	.052	50	.016*	.020	.026	350	n/a	.016*	.014*
5	.050	.058	.046	60	.019*	.019	.018	400	n/a	.016*	.014*
7 1/2	.045	.058	.046	75	.024*	.020	.019	450	n/a	.016*	.016*
10	.036	.072	.084	100	.020*	.016*	.012	500	n/a	n/a	.016*

Note: Above tables reference the voltage drop over distances. It was determined by using selection criteria of Motor Properties Table. In order to determine the voltagedrop, multiply the length by the data above.
For Example: For a 5 HP and 460 V motor, P/N 701804 would be used. For a distance of 200 feet, your voltage drop would be 200x.058=11.6 volts.
*Value is based on using single conductor table.