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3.3
Neutral Connection
The installation of the UPS does not affect the existing neutral system.
The neutral system may be affected if the UPS is operating with the neutral switched upstream.
3.4
External Protection and Isolating Devices
External devices for the protection of cables and for isolating the UPS external to the UPS must be
installed upstream of the equipment. Select and configure the isolating device according to Table 3.
• Such devices must be either curve C automatic circuit breakers or type GL/GG fuses.
• Disconnecting devices must be provided in building installations and other locations.
WARNING
!
The following label must be displayed on all switching devices installed in the same electrical
system as the UPS, even when they are located at a distance from the area.
ENSURE THAT THE UNINTERRUPTIBLE POWER SYSTEM IS ISOLATED BEFORE
WORKING ON THIS CIRCUIT.
Table 3
External protection device data
Protection Description
Input
Breaker
Output
Breaker
This table indicates the protection devices (circuit breakers and fuses) that must be installed for the
protection of both the cables and the equipment.
NOTE
If an external battery cabinet is present it should be located next to the UPS unit.
When such an option is supplied by Liebert it comes complete with protection devices and
correctly-sized cables.
When batteries are sourced from other suppliers, you should contact Customer Support
Technical Service for correct sizing of protection devices and interconnection cables.
Tower Power Rating (Phases In/Out)
10 - (1/1)
Fuse
120 Amps
96 Amps
Fuse
90 Amps
63 Amps
10 - (3/1)
40 Amps
32 Amps
90 Amps
63 Amps
9
Installation
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