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SECTION 4
Electrical Installation
Overview
Each of the pieces of equipment covered by this manual has six sets of power connections:
1. Input from the power source, typically, from the electric utility.
2. Power routed to the input of the first UPS.
3. Power routed to the input of the second UPS.
4. Power from the output of the first UPS.
5. Power from the output of the second UPS.
6. Power to the load
There are eight control connections between the Parallel Output Redundant
Cabinet and
the two UPS cabinets that must be made. The required control connections are described
later in this section.
A user accessible disconnect device must be provided (by others) between the output of
this cabinet and the load. Refer to
Table 4
for current requirements.
WARNING
Only qualified service personnel (such as a licensed electrician) should
perform the installation and initial startup. There is a risk of electrical shock.
Wiring Preparation
1. Verify that the equipment is the proper type. The equipment covered by this manual
is 480V 60 Hz input and 208V output, only. The Parallel Output Redundant Cabinet
can only be used in a wye-wye application. An input neutral connection is required.
2. Plan the locations of conduits. Two Conduit landing plates are provided at the
bottom of the cabinet. Power connections between the Parallel Output Redundant
and the UPS must be made through the bottom landing plate in the rear of the
cabinet to the bus bar terminal pads provided behind the circuit breakers on each
side of the cabinet above the lower row of breakers. The conduits must be placed
toward the rear of the cabinet a minimum of 6-1/4 inches away from the low voltage
wiring terminal lock, see
Figure 3
.
3. Power connections from the utility input and output load must be made through the
top of the cabinet to the bus bar terminal pads located behind the top row of
breakers and in the middle of the lower row of breakers.
