Lapp Online Catalog: VFD Selection Guide


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Technical Section

VFD Selection Guide

Motor Properties AWG Size Selection Chart
Drive HP	230V 3ø AWG	460V 3ø AWG	575V 3ø AWG		Drive HP	230V 3ø AWG	460V 3ø AWG	575V 3ø AWG
1/2 - 3	14	14	14		60	4/0	1	2
5	14	14	14		75	300 KCMIL	1/0	1
7 1/2	10	14	14		100	500 KCMIL	3/0	1/0
10	8	14	14		125	*	4/0	3/0
15	6	10	12		150	*	300 KCMIL	4/0
20	4	8	10		200	*	500 KCMIL	300 KCMIL
25	2	6	8		250	*	*	500 KCMIL
30	1	6	8		300	*	*	*
40	2/0	4	6		350	*	*	*
50	3/0	2	4		400 - 500	*	*	*

Note: The above table references the suggested wire AWG to use based on Horse Power (HP) and the Full Load Current (FLC) times 125% per NEC Art. 430-122 (A). Amperes (FLC) were determined from NEC Art. 430-250: For Example: For a 5 HP and 460 Volt motor, the FLC is 7.6A x 125% = 9.5A. The right AWG wire for 9.5A is 14 per NEC Art. 310.15. See Table 310.15(B)(16).


Voltage Drop Factors Volts at FLC @ 20ºC
Drive HP	230V 3ø AWG	460V 3ø AWG	575V 3ø AWG		Drive HP	230V 3ø AWG	460V 3ø AWG	575V 3ø AWG
1/2	.017	.008	.007		30	.020	.032	.042
3/4	.025	.012	.010		40	.021	.027	.033
1	.032	.016	.013		50	.023	.020	.026
1 1/2	.046	.023	.019		60	.016	.019	.018
2	.052	.026	.021		75	.012	.020	.019
3	.074	.037	.030		100	.011	.022	.021
5	.050	.058	.046		125	.008	.047	.022
7 1/2	.047	.058	.069		150	.008	.041	.015
10	.036	.072	.084		200	.006	.011	.013
15	.034	.045	.053		250	N/A	.010	.011
20	.028	.038	.047		300	N/A	.008	.009
25	.020	.028	.036		350	N/A	.008	.009


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