2-4 Installation
MN1221
Power Disconnect
A power disconnect should be installed between the input power service and the BPS for
a fail safe method to disconnect power. The BPS will remain in a powered-up condition
until all input power is removed from the BPS and the internal bus voltage is depleted.
Protection Devices
The AC input power lines must have suitable protection devices installed. Input and
output wire size is based on the use of copper conductor wire rated at 75
°
C. Use the
recommended circuit breaker or fuse types as follows:
Circuit Breaker:
1 phase, thermal magnetic.
Equal to GE type THQ or TEB for115 or 230 VAC
3 phase, thermal magnetic.
Equal to GE type THQ or TEB for 230 VAC or
GE type TED for 460 VAC.
Fast Action Fuses: Buss KTN on 230 VAC or
Buss KTS on 460 VAC, Buss FRS or equivalent.
Time Delay Fuses: Buss FRN on 230 VAC or
Buss FRS on 460 VAC or equivalent.
Table 2-2 describes the wire size to be used for power connections and the ratings of the
protection devices.
Recommended fuse sizes are based on the following:
115% of maximum continuous current for time delay fuses.
150% of maximum continuous current for fast or very fast acting fuses.
Table 2-2 Wire Size and Protection Devices
L1, L2, L3 Incoming Power
X3 Logic Power
Maximum
Input
Input Fuse
Wire Gauge
Wire Gauge
Catalog Number
Maximum
Continuous
Amps
Input
Breaker
Fast
Acting
Time
Delay
AWG
mm
2
Input
Fuse
AWG
mm
2
BPS2060
60A
90A
90A
70A
6
13.3
Internal
16
1.0
BPS2100
100A
150A
150A
115A
3
26.7
Internal
16
1.0
BPS3030
30A
50A
50A
40A
8
8.37
Internal
16
1.0
BPS3050
50A
70A
80A
60A
6
13.3
Internal
16
1.0
Note: All wire sizes are 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 output current and no harmonic current.
