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47
Installation
01.4IB.67000
Q. CONTROL CABLES
Space is provided for control cables to enter
the switchgear from either the top or the
bottom of the units. See drawings furnished
with the switchgear for detailed dimensions
and location of the control cable entry space.
When control conduits enter the unit from
below, entry space is located on each side of
the unit near the front inside the secondary
enclosure. The conduits should not extend
more than 1” above the floor.
Connect the cables to the terminal blocks in
accordance with the wiring diagrams furnished
for the specific job.
If the control conduits enter from above, drill
the top cover plate of the front enclosure to
suit the conduits, being careful not to damage
existing wire bundles. The top cover may
be removed temporarily to facilitate drilling.
Fasten the conduits to the cover with locknuts.
The cables from the control power source to
the switchgear should be large enough to
avoid excessive voltage drop when the circuit
breakers are operated. See testing instructions.
Where units have been split for shipment, any
control or other secondary leads which must
connect across the split will be arranged with
terminal blocks in a convenient location so
that the wires can be 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.
R. GROUND BUS
Where the equipment is shipped in more
than one section, the ground bus must be
connected by using the splice plates furnished
with the equipment. Assemble the ground bus
joints as outlined in Ch 4 Installation,
L. Connections.
The ground bus is bolted to the rear of the
frame near the bottom. It is arranged so that
connections to the station ground can be made
in any vertical section. Optional ground bus
pad can be provided in each section to provide
a convenient place to ground cable armor,
cable sheath, shields or ground wires. The
switchgear ground bus must be connected to
the station ground bus by a conductor having
a current-carrying capacity equal to that of the
switchgear ground bus.
It is very important that the equipment be
properly grounded to protect the operator
from injury when short circuits or other
abnormal occurrences take place, and to
ensure that all parts of the equipment, other
than live parts, are at ground potential.
!
S. SURGE PROTECTION
When surge arresters are furnished, the primary
cable terminal will be insulated at the factory
unless it must be disconnected for shipment.
When this connection is completed in the field,
it will be necessary to insulate the primary
connection before the switchgear is energized.
PVC boots will normally be supplied to insulate
these connections.
When surge arresters are not furnished, it will
be the responsibility of the user to provide
suitable protection for switchgear from
damage due to lightning or other surges.
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