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Input Current and Wire Ratings
Wiring to the BPM varies based on the UPS selection. Refer to the UPS manual for recommended input breaker
size. To easily expand the system, it is recommended that initial installation of the BPM and UPS contains
wiring to support the maximum capacity of the UPS system. For example, if the UPS is now designed to be a
12 kVA system with an 80A input, but can be expanded to 18 kVA requiring 125A input in the future, then 125A
wiring would be used initially to prevent rewiring costs during future expansion.
Local electrical codes should always be followed, but be sure to check with the terminal block sizing on both
the UPS and the BPM. The UPS terminal block sizing can be found in the UPS manual, while the BPM terminal
block sizing can be found in Table 2.
Table 2. RBPM Terminal Block Sizing
BPM Terminal Block Sizing
BPM 125A Models
BPM 30A Models
FOR U.S. INSTALLATIONS, READ THIS IMPORTANT NOTE
Table 2 lists the mm
l
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
l
Table 310–16 of the National Electrical Code
circuit conductors, including the neutral conductor, 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.
Signal Wire Routing
The auxiliary contacts must be wired to the BPM from the UPS for proper functionality. These
auxiliary contacts signal the UPS to go to Internal Bypass mode to provide a synchronized transfer.
Failure to wire the auxiliary contacts can be dangerous and result in system failure.
To route signal wires (customer supplied):
1.
Route the signal wires through the provided insulation.
2.
Pass the insulated wires through the opening in the rear panel (Figure 15).
3.
Connect terminal blocks to signal wires.
4.
Plug in the terminal blocks into their proper locations.
75°C Copper Wire Size
42.1 mm
8.4 mm
and AWG wire size for each circuit breaker size shown on the wiring
2
NOTE 1
Refer to the UPS manual and "Input Current and Wire Ratings" on page 11 for
breaker, terminal block, and wire sizing.
NOTE 2
Provide enough flexibility in the conduit for the BPM to be firmly mounted in the
rack (see step 7 , Figure 9).
NOTE 3
Connection diagrams can be found on pages 9-11 for wiring details.
Eaton Bypass Power Module (BPM) User's Guide P-164000628—Rev 2 www.eaton.com/powerquality
Conductor Screw Torque
(1 AWG)
6.6 Nm (50 lb in)
2
2
(8 AWG)
4.5 Nm (40 lb in)
!
IMPORTANT
®
(NEC
®
), ANSI/NFPA 70-1999, and article 220. All
CAUTION
Installation
Wire Size Range
10 - 1/0 AWG
14 - 6 AWG
11
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