Medium Voltage Power Connections - Toshiba JKSSS Series Instruction Manual

Basic Installation and Operation
Guide
Power circuit fuses were selected and installed in accordance with the application requirements. Fuses must be
completely inserted in their holders. Instruction on removing and installing the fuses can be found in one of the following
manuals: VF010H03 (Fixed Type) or VF010H01 (Drawout Type).
Electrical Checks
With incoming power isolated and all loads disconnected electrically, the control circuit and other mechanisms should be
exercised to determine that the devices operate properly. An auxiliary source of control power will be necessary to
provide power to the electrical operators.
WARNING
The ground fault protection system (if furnished) should be tested in accordance with the instructions furnished with the
device.
An electrical insulation test should be performed to ensure that the controller and associated field wiring are free from
short circuits and grounds. The preferred method is to perform a dielectric test at 2.25 times the nominal system voltage
plus 2000 volts. This should be done phase-to-ground, phase-to-phase and phase-to-neutral (if applicable), with all
switches and circuit breakers opened. Disconnect any devices which may have limited dielectric strength and that are not
intended for this test.
The light or buzzer, or both, used to indicate breakdown should be calibrated to indicate failure with an output current
between 1.5 and 2.0 milliamperes per 1000 volts applied.
WARNING
All devices must be set to their normal or OFF position before energizing incoming power.

2.8 - Medium Voltage Power Connections

Use a properly calibrated torque wrench to tighten all MV connections according to
the chart.
Connections
Cable and wire bundles that enter the controller enclosure should be routed to avoid
interference with moving parts. Minimum bending radius for the type of cable used
should be observed.
Power cables should be braced and/or laced to withstand short circuit forces
wherever such cables are unsupported. Power cables should be adequately sized to
carry the motor full load current in accordance with NEC requirements, and have an
adequate voltage rating. Cables should be dressed and terminated as appropriate to
the voltage class and cable manufacturer's recommendations.
TOSHIBA
Electrical shock hazard. Do not touch energized components
during a test using auxiliary power.
Hazardous voltages are present during dielectric testing that can result in
serious injury or death. High potential test should be performed only by qualified
personnel. Refer to safety instructions provided with the test equipment.
JKSSS Series Solid State Soft Starters
Bolt
Size
1/4 - 20
3/16 - 18
3/8 - 16
7/16 - 14
1/2 - 13
9/16 - 12
5/8 - 11
3/4 - 10
7/8 - 9
1.0 - 8
Torque Specs for MV Power
Connections
Torque at Full
Engagement
(ft - lbs)
6
12
18
30
45
68
90
150
240
245
16