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Chapter 4
UPS Electrical Installation
Risk of electrical shock. Only qualified service personnel (such as a licensed electrician) should
perform the electrical installation in this section.
If a bypass switch is not used, the UPS input may be hardwired through conduit to a main power source circuit
breaker, and the UPS output may either be hardwired to a circuit breaker in a distribution panel (as shown in
Figure 27) or supplied to loads through optional receptacles on the back of the UPS. Without a bypass switch,
power to the load cannot be maintained if the UPS is taken completely offline.
Figure 27. Typical Installation without a Bypass Switch
Input Current Ratings
Table 5 contains the required circuit breaker ratings for hardwired installations.
Table 5. Required Input Circuit Breaker Sizes (120/208 Vac or 120/240 Vac, 60 Hz)
Building
Service
Panel
UPS Capacity
4 kVA
8 kVA
12 kVA
16 kVA
20 kVA
WARNING
Load
Distribution
Panel
User-Supplied
External Battery
Module
(if required)
(optional)
Input Circuit Breaker Rating
25A
50A
75A
100A
125A
Eaton 9PXM UPS (4-20 kVA) User's Guide
P-164000669—Rev 05
31
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