Ac Main Circuit; Protection Devices; Power Disconnect; Wire Size And Protection Devices - Baldor 18H Series Installation & Operating Manual

Section 1
General Information

AC Main Circuit

Protection Devices

Power Disconnect

Wire Size and Protection Devices

Table 3-4 Wire Size and Protection Devices - 230 VAC Controls
Control O tp t Control Output
P Power Rating R ti
1
2
3
5
7.5
10
15
20
25
30
40
50
Note: All wire sizes based on 75 C copper wire, 3% line impedance. Higher temperature smaller gauge wire may be
used per NEC and local codes. Recommended fuses/breakers are based on 25 C ambient, maximum
continuous control output current and no harmonic current.
3-10 Receiving & Installation
Be sure a suitable input power protection device is installed. Use the recommended circuit
breaker or fuses listed in Tables 3-4 through 3-6 (Wire Size and Protection Devices). Wire
sizes and protective device specifications are based on the controls' maximum output power
rating for the operating zone. Refer to Quad ratings in Section 7 of this manual. If the output
power from the control will be less than the maximum, the sizes of the wire and protective
devices may be adjusted accordingly. Be sure to follow NEC, UL and other applicable codes.
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:
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.
p Inp t Breaker Input Breaker p
Fast Acting
5A
10A
15A
20A
25A
35A
50A
60A
80A
100A
125A
150A
1 phase, thermal magnetic.
Equal to GE type THQ or TEB for 230 VAC
3 phase, thermal magnetic.
Equal to GE type THQ or TEB for 230 VAC or
GE type TED for 460 VAC and 575 VAC.
230 VAC, Buss KTN
460 VAC, Buss KTS to 600A (KTU 601 - 1200A)
575VAC, Buss FRS
230 VAC, Buss JJN
460 VAC, Buss JJS
575 VAC, , Buss JJS
230 VAC, Buss FRN
460 VAC, Buss FRS to 600A (KTU 601 - 1200A)
575 VAC, Buss FRS to 600A (KTU 601 - 1200A)
Input Fuse Inp t F se
Time Delay
5A 5A
10A 8A
15A 12A
25A 12.5A
30A 25A
40A 35A
60A 50A
80A 60A
100A 80A
125A 100A
150A 125A
200A 150A
Wire Ga ge Wire Gauge
2
AWG mm
14 2.5
14 2.5
14 2.5
14 2.5
12 4
10 10
8 10
4 25
4 25
3 30
1 50
2/0 70
MN718