IMPULSE•G+/VG+ Series 4 Technical Manual
November 2022
Page 31
3.2 Suggested Circuit Protection and Wire Size
In order to comply with most safety standards, circuit protective devices should be used between the incoming
three-phase power supply and the VFD. These devices can be thermal, magnetic, or molded-case circuit breakers
(MCCB); or “slow-blow” type time-delay fuses.
NOTE:
The following are recommendations based on the rated capacity of the VFD. Per NEC guidelines, circuit
protection and wiring can be selected based on the capacity of the motor.
Table 3-1: Wire Size and Circuit Protection for 230 V Class
1) NFPA 70 National Electric Code 2017. Tables 430.122(a), 310.15(b)(16), and 610.14(a), 75°C conductor, 60-minute, copper with 40°C ambient
correction factor.
2) NFPA 70 National Electric Code 2017. Table 250.122.
3) NFPA 70 National Electric Code 2017. Table 430.52 (selected based on VFD input Amps).
4) One wire per terminal at 16AWG, or two wires per terminal (same type and size) at 18AWG.
Model Number
(-G+/VG+ S4)
Maximum Circuit Protection
Recommended Wire Size (AWG)
1
Continuous
HD Input
Amps
Time Delay
Input Fuse
(A)
3
Time Delay
Input Fuse
Class
Inverse Time Molded/
Case Circuit Breaker (A)
3
Power Circuit
Wiring
Control
Wiring
4
Ground
Copper
2
(Fuse)
Ground
Copper
2
(Breaker)
2003
2.9
5.6
CC
15
14
18 to 16
14
14
2005
5.8
12
CC
15
14
18 to 16
14
14
2007
7.0
15
CC
20
14
18 to 16
14
12
2008
7.5
15
CC
20
14
18 to 16
14
12
2011
11.0
20
CC
30
14
18 to 16
12
10
2014
15.6
30
CC
40
14
18 to 16
10
10
2017
18.9
35
J
50
14
18 to 16
10
10
2025
28.0
50
J
70
12 to 10
18 to 16
10
8
2033
37.0
70
J
100
10 to 8
18 to 16
8
8
2047
52.0
100
J
150
8 to 6
18 to 16
8
6
2060
68.0
125
J
175
6 to 4
18 to 16
6
6
2075
80.0
150
J
200
4 to 2
18 to 16
6
6
2085
82.0
150
J
225
4 to 2
18 to 16
6
4
2115
111
200
J
300
2 to 1/0
18 to 16
6
4
2145
136
250
J
350
1/0 to 2/0
18 to 16
4
3
2180
164
300
J
450
1/0 to 4/0
18 to 16
4
2
2215
200
350
J
500
3/0 to 250
18 to 16
3
2
2283
271
500
J
700
250 to 400
18 to 16
2
1/0
2346
324
600
J
1000
(2)1/0 to (2)3/0
500
18 to 16
1
2/0
2415
394
700
J
1000
(2)4/0 to (2)250
300 to 350
18 to 16
1/0
2/0
CAUTION
The following guidelines are suggested values. Always conform to local electrical codes and wiring practices.
