2.4
Handling and Installation
2.4.1 Removable angles or eye bolts shall be provided at the top of the structure for lifting.
3.
Power Bus
3.1
Horizontal power bus shall be located at the center rear of the cubicle, in the same location as
other JK Series controllers.
3.2
Horizontal power bus ratings of 1200 and 2000 amperes are available. Bus sizes shall match
those provided in other JK Series controllers.
3.3
Horizontal power bus shall be braced for 50kA RMS symmetrical.
3.4
Horizontal power bus shall be tin plated as standard with insulated bus and silver plating optional.
3.5
Bare copper 1/4 x 2 inch horizontal ground bus shall be available and the location shall match
other JK Series controllers.
3.6
Vertical power bus feeding 400 ampere controllers shall be 1/4 x 1-1/4 inch tin plated copper.
Insulated bus and silver plating are optional.
3.7
Horizontal power bus shall be front accessible by removing or swinging open a panel.
4.
Medium Voltage Controllers - 400 Amperes
4.1
Medium Voltage Controller Compartment
4.1.1 The medium voltage controller compartment for controllers rated 400 amperes shall consist
of an isolation switch (4.2), a fixed mounted vacuum contactor (4.3), three fixed mounted power
fuses (4.4), three current transformers and a control power transformer with primary fuses.
Optionally a second control or potential transformer with primary fuses may be provided.
4.1.2 Internal power connections between power components shall be made using either high
voltage cable or bus bars.
4.1.3 Connection of customer's outgoing load cables shall be made to terminals mounted on the
rear of the medium voltage contactor. It shall be possible to terminate outgoing load cables with
the removal of the horizontally mounted power fuses. Sufficient wire bending space shall be
provided for terminating shielded cables as large as 1-2/0 per phase, or unshielded cables as
large as 1-350MCM per phase, top or bottom entry.
4.1.4 A zero sequence current transformer for ground fault sensing when required shall be
provided. It shall be located within the MV compartment where customer’s load cable can be
conveniently passed through the current transformer window prior to termination.
4.1.5 Three current transformers for metering and relaying shall be provided. These shall be of
the window type (or bar type as option) with burden capacity as required for operating the various
meters and relays.
4.1.6 Control power and optional potential transformers shall be of the encapsulated type with
primary fuses. Primary side of transformers shall be wired to the load side of the main controller
power fuses. Transformers shall be arranged to provide easy access for replacement of primary
fuses.
