GE Industrial Solutions AKD-20 Low Voltage Switchgear - Manuel (Page 15)

AKD-20 Low Voltage Switchgear
Chapter 3. Description
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3-3 Compartment Area
The front enclosure of each section is divided into individual
compartments. These compartments house either a low-voltage
power circuit breaker or are used to mount instruments, control
components and other ancillary devices.
3-4 Instrument Panel
A standard instrument panel, Fig. 3-3, is located above each breaker
compartment eliminating cross-hinge wiring. When required,
optional devices may be included and mounted on the front face of
the panel such as breaker control circuit fuses, pilot lights, and a RELT
switch.
Fuses for the close and trip circuits of the electrically operated
breakers are mounted on the panel. Routine wiring inspections and
fuse checks or fuse replacements can be performed with the breaker
compartment door in the closed position so that operators are
protected from the energized primary circuits.
1. Control circuit fuses
2. Pilot lights
3. RELT Switch & Indication
Fig. 3-3. Instrument panel
An instrument compartment, Fig. 3-4, is available as a standard
feature. Internal hinged panels are also available, these panels can
be used to mount instruments and other devices associated with the
switchgear metering, monitoring and control.
Relays, fuse cutouts and similar devices may be installed in the
compartment behind the swing-out device panel or in adjacent
compartments.
Fig. 3-4. AKD-20 Instrument compartment (swing-out device
panel not shown)
3-5 Breaker Compartment
Closed-door drawout circuit breaker compartments, Fig. 3-5, are
standard construction with all AKD-20 switchgear equipment. The
circuit breaker compartment doors remain closed and latched while
the breaker is racked out from the CONNECTED position, through
TEST, to the DISCONNECTED position.
Breaker compartment doors do not have any ventilation slots, thus
protecting operators from hot ionized gases which may be vented by
the breaker during circuit interruption. Additionally, the breaker
compartment, Fig. 3-6, is enclosed by grounded steel barriers on the
top, sides, bottom, and front. In the back, a flame-retardant, track
resistant, glass-filled polyester base minimizes the possibility of fault
communication between compartments or to the bus.
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