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Symmetra
TM
Wiring
n All power and control wiring must be installed by a
licensed electrician only. All input, output and emer-
gency power off wiring must comply with the National
Electric Code (NEC) and applicable local codes.
n It is highly recommended that flexible metal conduit
be used when hardwiring the Power Array. This will
provide for ease of service and maintenance of the sys-
tem.
There are four categories of hardwiring installation proce-
dures for the Symmetra
TM
Power Array. These are; input
wiring, output wiring, remote emergency power off switch
wiring, and installing an optional local grounding electrode.
Input Wiring
The Power Array requires a single phase 208V or 240V in-
coming AC utility power source. Incoming power is wired
directly to a terminal block inside the Power Array. Specifi-
cations and installation procedures are provided.
Output Wiring
Power is distributed to the load equipment via hardwired
connections to an output terminal block inside the frame,
and by plugging the load equipment into an optional power
distribution panel. The Power Array delivers 120V/208V/
240V power to the output terminal block. Configurations
for hardwiring 120/240V and 120/208/240V output voltages
are provied in this chapter. Specifications and installation
procedures are provided.
REPO Switch Wiring
The Symmetra
TM
Power Array can be connected to either a
dry contact, or a 24Vdc remote emergency power off (REPO)
switch. The wiring terminal connections for the REPO are
physically isolated from the primary circuitry of the Power
Array. Specifications and installation procedures for REPO
wiring are provided.
Local Grounding Electrode
A 1/2” knockout is provided on the output wiring access panel
for those sites where NEC code 250-26 requires a local
grounding electrode. This grounding electrode is installed in
addition to the equipment safety ground that is run with the
input hardwiring connection. The local grounding electrode
is connected from the output terminal block to the nearest
effective ground, such as building steel, a metal water pipe,
or other appropriate grounding structure. The procedure
for installing a local grounding electrode is included in the
output wiring procedures.
Note: The local grounding electrode must meet National Elec-
tric Code standards, as per NEC Table 310-16.
Chapter 4 - Electrical Requirements and Procedures
4-1