Ac Main Circuit; Power Disconnect; Protective Devices; Wire Size And Protection Devices - Baldor 15H SERIES 15H Installation & Operating Manual

AC Main Circuit

Power Disconnect

Protective Devices

Wire Size and Protection Devices

Table 3-2 230VAC Controls (3 Phase) Wire Size and Protection Devices
Control Rating
Amps
3
4
7
10
16
22
28
42
54
68
80
104
130
145
192
Note: All wire sizes are based on 75 C copper wire. Higher temperature smaller gauge wire may be used per NEC
and local codes. Recommended fuses/breakers are based on 40 C ambient, maximum continuous control
output current and no harmonic current.
3-6 Receiving & Installation
A power disconnect should be installed between the input power service and the control
for a fail safe method to disconnect power. The control will remain in a powered-up
condition until all input power is removed from the control and the internal bus voltage is
depleted.
Recommended fuse sizes are based on the following:
115% of maximum continuous current for time delay.
150% of maximum continuous current for Fast or Very Fast action.
Note: These general size recommendations do not consider harmonic currents or
ambient temperatures greater than 40 C.
Be sure a suitable input power protection device is installed. Use the recommended
circuit breaker or fuses listed in tables 3-2 through NO TAG (Wire Size and Protection
Devices). Input and output wire size is based on the use of copper conductor wire rated
at 75 C. The table is specified for NEMA B motors.
Circuit Breaker:
Fast Action Fuses:
Very Fast Action:
Time Delay Fuses:
Input Breaker Input Breaker
HP (Amps)
0.75 7
1 7
2 15
3 15
5 20
7.5 30
10 40
15 60
20 70
25 90
30 100
40 150
50 175
60 200
75 250
1 phase, thermal magnetic.
Equal to GE type THQ or TEB for 230VAC
3 phase, thermal magnetic.
Equal to GE type THQ or TEB for 230VAC or
Equal to GE type TED for 460VAC and 575VAC.
230VAC, Buss KTN
460VAC, Buss KTS to 600A (KTU for 601 to 1200A)
575VAC, Buss FRS TO 600A (KTU for 601 to 1200A)
230VAC, Buss JJN
460VAC, Buss JJS
575VAC, Buss JJS
230VAC, Buss FRN
460VAC, Buss FRS to 600A (KTU for 601 to 1200A)
575VAC, Buss FRS to 600A (KLU for 601 to 1200A)
Input Fuse (Amps)
Fast Acting Time Delay
5 4
6 5
12 9
15 12
25 20
35 30
45 35
70 60
80 70
100 90
125 110
175 150
200 175
225 200
300 250
Wire Gauge
2
AWG mm
14 2.5
14 2.5
14 2.5
14 2.5
12 3.31
10 5.26
8 8.37
6 13.3
6 13.3
4 21.2
3 26.7
1 42.4
1/0 53.5
2/0 67.4
4/0 107.0
MN715