WALL-MOUNTED BYPASS SWITCH INSTALLATION
Eaton 9155 UPS (8–15 kVA) User's Guide S 164201553 Rev G (www.eaton.com/powerquality)
37
Wiring the Wall-Mounted Bypass Switch
The Eaton 9155 UPS has the following power connections:
S 2‐phase (L1 and L2), neutral, and ground connection for rectifier/bypass input
S 2‐phase (L1 and L2), neutral, and ground connection for load output
The nominal input/output voltages are:
S 100/200, 110/220, or 120/240 Vac with 180° phase displacement
S 120/208 or 127/220 Vac with 120° phase displacement
Output overcurrent protection and disconnect switch must be provided by others.
Figure 29 on page 41 shows a oneline diagram of the UPS with a wall-mounted
bypass switch.
W A R N I N G
Only qualified service personnel (such as a licensed electrician) should perform the hardwired installation.
Risk of electrical shock.
To hardwire the wall-mounted bypass switch:
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 and wire sizes to the specifications in Table 5
on page 39.
NOTE To accommodate the feature of easy system expandability, it is recommended that initial installation
of the Eaton 9155 UPS contain wiring to support the maximum capacity of the UPS cabinet.
3. Switch off utility power to the distribution point where the bypass switch cabinet
and UPS will be connected. Be absolutely sure there is no power.
4. Determine your equipment's grounding requirements according to your local
electrical code.
5. Verify that the UPS battery circuit breaker is in the OFF position (see Figure 25).
6. Remove the UPS wiring access cover and retain (see Figure 25).
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