Medium Voltage Power Connections - Toshiba JK 400 Series Instruction Manual

Basic Installation and Operation Guide
b. Ground leads should be
connected to cable
potheads/shields as
specified by the
manufacturer of these
devices.

Medium Voltage Power Connections

Use a properly calibrated torque wrench to tighten all MV connections according
to Figures 10a and 10b.
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.
Main power bus (when provided) and horizontal ground
bus are supplied with links to join shipping sections
together. These should be installed in accordance with
Fig. 9 through Fig. 12. All access covers, barriers,
partitions, etc., that are temporarily removed during
installation must be replaced.
TOSHIBA
JK 400 Series Fixed Controllers
Fig. 9 Ground Bus Splice
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
Torque at Full
Bolt Size Engagement
(ft - lbs)
1/2 - 13 45
28
3/8 - 16 25
18
5/16 - 18 15
M 12 35
Fig. 10b Torque Specs for Bus Connections
Torque at Full
Engagement
(ft - lbs)
6
12
18
30
45
68
90
150
7/8 - 9 240
1.0 - 8 245
Fig. 10a Torque Specs for
MV Power Connections
Type of Connection
Bus - Bus
Bus - Bus
Bus - Glastic Ins.
Bus - Porcelain Ins.
7