Wiring Connections; Wiring Inspection - Liebert 300 series Installation, Operaton & Maintenance Manual

2.4.4 Wring Connections
Verify the following connections have been
made:
AC power cables from input power
1.
(or optional external maintenance bypass
cabinet) to UPS Module Input. (Observe A-
B-C phase rotation.)
Standard Series 300 UPS modules are
provided with an input auto transformer. If
there are line-to-neutral loads connected to
the UPS output, the input source must be
If the Series 300 UPS module is provided
with an optional input isolation transformer,
an input neutral conductor is not required
and the UPS can be fed from either delta or
wye connected utility service.
DC power cables (positive and negative)
2.
from battery cabinet to UPS module DC bus
(observe proper polarity).
When multiple conductors are used horn the
battery to the UPS module, it is necessary to
run the same number of positive (+) and
negative (-) cables in the same cable tray or
conduit.
AC power cables from the UPS output to the
3 .
critical load distribution (or optional
external maintenance bypass cabinet, or
optional slim-line distribution panel).
(Observe A-II-C Phase Rotation.)
The output source should have three phases,
plus neutral (if line-to-neutral loads will be
powered from the UPS output) plus ground.
4. Any additional special control wiring must
be run in individual separate conduit.
3. UPS input and output neutral must be
connected to only one common point in the
UPS. This neutral line must he grounded at
the source. (An input neutral is not required
with the optional input isolation
transformer.)
NOTE
Refer to SECTION 5 - SYSTEM
OPTIONS for instructions and drawings
for optional components.

2.4.5 Wiring Inspection

1.
2.
tight:
Verify all power wires and connections have
3.
proper spacing between exposed surfaces,
phase-to-phase, and phase-to-ground.
4.
individual, separate, rigid steel conduit.