EXTERNAL BYPASS SWITCH INSTALLATION
Eaton FERRUPS FE/QFE UPS (500 VA–18 kVA) Installation Guide
S
164201403 Rev B
www.eaton.com/powerquality
31
2.
Review the installation wiring diagram and applicable notes to find
the proper circuit breaker size for your installation. In the US, see
Table 10 to size the wire. In other areas, use 75
°
C copper wire and
size according to the local code.
Table 10. Recommended Wire Sizes
Input Circuit Breaker Size
75
°
C Copper Wire Size
15A, 20A
12 AWG (3.3 mm
2
)
25A, 30A
10 AWG (5.3 mm
2
)
35A, 40A, 45A, 50A
8 AWG (8.4 mm
2
)
60A
6 AWG (13.3 mm
2
)
70A, 80A
4 AWG (21.2 mm
2
)
90A, 100A
3 AWG (26.7 mm
2
)
110A
2 AWG (33.6 mm
2
)
125A
1 AWG (42.1 mm
2
)
150A
1/0 AWG (53.5 mm
2
)
FOR US INSTALLATIONS, READ THIS IMPORTANT NOTE!
This table lists the AWG and mm
2
wire size for each circuit breaker size shown on the wiring diagrams. The minimum
recommended circuit breaker sizes for each model and voltage application are listed on the wiring diagrams.
Conductor sizes shall be no smaller than the 75
°
C wire size based on the ampacities given in Table 310–16 of the
National Electrical Code, ANSI/NFPA 70-1999, and article 220. All circuit conductors, including the neutral and
equipment grounding conductors, must be the same size (ampacity) wire. Code may require a larger AWG size than
shown in this table because of temperature, number of conductors in the conduit, or long service runs.
Follow local
code requirements.
3.
Mount the bypass switch within sight of the UPS. If you do not
have an Eaton bypass switch with an AC disconnect switch or the
fuse box or panel is out of sight, you must install a separate
disconnect switch next to the UPS.
4.
Remove the screws in the lower part of the bypass switch front
cover and remove the lower cover panel.
Remove the knockouts or plugs in the bottom of the bypass switch
for AC Line Input, AC to UPS Input, AC from UPS Output, and AC to
the UPS load.
