Vacuum Contactor; Outgoing Load Connections - Toshiba JK 400 Series Instruction Manual

Basic Installation and Operation Guide JK 400 Series Fixed Controllers
B. Vacuum Contactor
The Type HCV-5HA/7HA vacuum contactor (Fig. 26) used in Toshiba JK
400 ampere controllers is a compact, fix-mounted device. It is mounted to
the floor of the controller compartment, beneath the isolation switch.
Switching occurs entirely within vacuum bottles, which results in long life with
virtually no maintenance. The contactor is mechanically interlocked with the
isolation switch so that the switch may not be opened or closed unless the
contacts of the vacuum contactor are open.
Fig. 26 Type HCV-5HA/7HA

Vacuum Contactor

C. Outgoing Load Connections
Connections for outgoing load cables are located at the rear of vacuum
contactor. Cables may enter the controller from either the top or bottom of
the enclosure, at the points indicated on the outline drawings furnished with
the equipment, through the wireways provided.
The standard cable exit is shown in Fig. 27a. To access cable termination
areas, remove fuse barriers and fuses (see Power Fuse). Non-shielded
cable up to one 350MCM per phase or shielded cable up to one 2/0 per
phase can be accommodated through the window (donut) type current
transformer and terminated at the provided aluminum mechanical lugs
behind the vacuum contactor.
If necessary, the current transformer can be easily removed, to feed load
cables through opening windows, by unscrewing the secondary terminal
wires and two mounting nuts. Fig. 27a Load Cable Connections,
Top Exit
If a ground sensor (optional) is supplied with the equipment as shown in Fig.
27b, route all the load cables through the sensor. Ground wires from
shielded cable terminators must be routed back through the window type
current transformer and ground sensor window before attaching to ground
bus.
After installation, be sure the secondary terminal wires on the current
transformer are re-connected correctly and securely, the load cables are not
pressing on the current transformer excessively, the lugs are torqued at 120
in-lbs for lugs rated for wire ranges from 1/0 to #14 and at 275 in-lbs for lugs
rated for wire ranges from 350MCM to #6, and check to see that at see that
the minimum clearance (per NEC) is maintained between live parts and
between live parts and ground.
For aluminum cable, "DE-OX" inhibitor is recommended at the termination.
Fig. 27b Ground Sensor
Installation
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