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01.4IB.46300
Installation
When control conduits enter the unit from
below, the conduit should not extend more
than 1 inch above the floor. The control cables
may be pulled through the conduits before
or after the switchgear is installed, whichever
is more convenient. If the control conduits
enter from above, drill the top cover of the
enclosure to suit the conduits, being careful
not to damage existing wire bundles. Fasten
the conduits to the cover with locknuts.
Connect the cables to the terminal blocks in
accordance with the wiring diagrams furnished
for the specific job. The cables from the control
power source to the switchgear must be large
enough to avoid excessive voltage drop when
the controllers are operated.
Where units have been split for shipment, any
control or other secondary leads that must be
reconnected across the split will be arranged
with terminal blocks in a convenient location
so that the wires can be easily reconnected.
The wires will be cut to length and formed
before being folded back so that a minimum
of time will be required for reconnecting them.
Refer to the schematic and wiring diagrams
furnished for each specific job for connection
of all control wires to the designated terminal
blocks.
CAUTION
Control wiring terminal blocks are supplied
in great variety depending upon individual
customer specifications. Refer to the
manufacturer’s instructions for the terminal
blocks supplied for specific connection
recommendations such as maximum torque
values, etc.
Q. s
urge
p
rotection
It is the responsibility of the purchaser to
provide suitable surge arresters to protect
the motor control center from damage due
to lightning or other electrical surges. When
surge arresters are furnished as part of the
switchgear, the primary cable termination
is insulated at the factory unless it must
be disconnected for shipment. When this
connection is completed in the field, it is
necessary to insulate the primary connection
before the switchgear is energized. Normally,
PVC boots are supplied to insulate these
connections.
r. M
ecHanical
o
peration
c
Heck
To perform the mechanical operation check,
it is necessary to reinstall any of the primary
circuit components that were removed
previously to facilitate assembly and cable
terminations.
!
CAUTION
Due to electrical clearance requirements, any
phase barriers supplied with the contactor
must be installed before the contactor is
energized.
