Powered by Safety
®
21
Installation
01.4IB.26264A
J. p
oWer
c
ABleS
Access the primary cable connections in
Powell FlexGear™ by opening the hinged rear
doors. Before any primary cable connections
are made, the cables should be identified
to indicate their phase relationship with the
switchgear connections. This is necessary to
ensure that the motors will rotate in the proper
directions and that the phase rotation is the
same when interconnecting two different
sources of power. If parallel cables are used it is
imperative to confirm phasing of each cable by
test. Normally compression terminals are used
to terminate primary cables.
k. c
ontrol
c
ABleS
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.
If the control conduits enter from above, drill
the top cover of the front enclosure to suit the
conduits, being careful not to damage existing
wire bundles. Fasten the conduits to the cover
with locknuts.
The cable from the control power source
to the switchgear must be large enough to
avoid excessive voltage drop when the circuit
breakers are operated (see testing instructions
that apply to a particular device). Where units
have been split for shipment, any control or
other secondary leads that 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 time will be
required for reconnecting them. All entries
should be sealed with duct seal to prevent gas
transmission in case of a fault.
Any connections to the power bus that will
enter the instrument compartment must follow
the guidelines found in
Wiring for Arc Resistant Equipment
The power bus in this equipment is insulated,
however, air is the primary insulation medium.
Do not place any object or add wiring in this
air space as it may compromise the dielectric
capability of the equipment.
Do not place any object in this air space
when energized. If done, it could result in
equipment damage and/or minor or moderate
injury to personnel.
!
CAUTION
l. f
Ield
W
IrInG
p
recAutIonS
for
A
rc
r
eSIStAnt
e
quIpMent
Special precautions are required when adding
or removing control wiring in arc resistant
configurations of FlexGear as openings in
the walls of the enclosure may allow the by-
products of an arcing fault to escape from the
unit in an undesirable manner. The overall
rating of the equipment is IEEE Type 2B. This
provides arc fault protection for the perimeter
of the switchgear and specifically allows the
instrument compartment to be open while
the equipment is energized. The instrument
compartment of arc resistant FlexGear is
segregated from the power circuit with respect
to venting gases produced by an internal
arcing fault. This means there are precautions
that must be followed when adding or
removing control wiring that enters the
instrument compartment to ensure compliance
with the original design test requirements of
the equipment.
