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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
1/4 - 3
18
18
18
60
2/0
3
4
5
14
18
18
75
4/0
2
3
7 1/2
12
18
18
100
300 MCM
1/0
2
10
10
16
18
125
500 MCM
2/0
1/0
15
8
12
14
150
*
3/0
2/0
20
6
10
12
200
*
300 MCM
4/0
25
4
8
10
250
*
400 MCM
300 MCM
30
3
8
10
300
*
*
400 MCM
40
2
6
8
350
*
*
500 MCM
50
1/0
4
6
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. 430-22 (A). Amperes (FLC) were determined from NEC Art. 430-150:

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 18 per NEC Art. 310-16, 90ºC. See Table 310-16.


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
 
 Note: The above table references the voltage drop over distances. It was determined by using selection criteria of Motor Properties Table. In order to determine the voltage drop, multiply the length by the data above.

For Example: For a 5 HP and 460V motor, P/N 701804 would be used. For a distance of 200 feet, your voltage drop would be 200 x .058 = 11.6volts.


    
 
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