Instruction manual

Eaton 9355 UPS (20/30 kVA) Installation and Operation Manual S 164201626 Rev C www.eaton.com/powerquality

Chapter 5 Electrical Installation

The Eaton 9355 has the following power connections:

S 3‐phase (L1, L2, and L3), neutral, and ground connection for rectifier/bypass input

S 3‐phase (L1, L2, and L3), neutral, and ground connection for load output

The nominal input/output voltages are:

S 120/208 or 127/220 Vac (UPS only or parallel system)

S 208V, 480V, or 600V 60-Hz input is available when using the Options Cabinet with

an input isolation transformer

S 480/480 Vac is available when using the Options Cabinet with an output

transformer

Output overcurrent protection and disconnect switch must be provided by others.

Figure 24 through Figure 31 beginning on page 38 show the oneline diagrams.

W A R N I N G

Only qualified service personnel (such as a licensed electrician) should perform the UPS installation and

initial startup. Risk of electrical shock.

Wiring Preparation

To begin wiring the UPS or Options Cabinet:

1. Verify that the electrical connections to the installation site have been properly

installed.

2. A wall-mounted, user‐supplied, readily‐accessible disconnection device must be

incorporated in the input wiring.

Compare the circuit breaker ratings to the ones in Table 1 on page 36.

NOTE To accommodate the feature of easy system expandability, it is recommended that initial

installation of the Eaton 9355 UPS contain wiring to support the maximum capacity of the UPS cabinet.

3. Switch off utility power to the distribution point where the UPS or Options

Cabinet will be connected. Be absolutely sure there is no power.

4. Determine your equipment's grounding requirements according to your local

electrical code.

5. Remove the UPS front door (see page 10).

6. Verify that the UPS input circuit breaker is in the OFF position (see Figure 12).

7. Verify that the UPS battery circuit breaker is in the OFF position.

8. If you ordered the UPS with the optional output circuit breaker, verify that the

output circuit breaker is in the OFF position.

9. Remove the UPS wiring access cover and retain.