AKD-20 AR / Entellisys AR Low-voltage Switchgear
DEH-41473
Section 3. Switchgear Description
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Breaker Compartment Door
Each circuit breaker compartment door is provided with two
self-latching mechanisms with a single “T”-shaped door
handle (Figure 3.18).
To open the door, rotate the handle clockwise to release the
latch mechanisms and pull the door outward.
Operating the handle is not necessary to close the door.
Simply close the door and push on the door directly behind
each latching mechanism (Figure 3.18). Confirmation of the
door being latched can be achieved by pulling on the “T”-
shaped handle while not rotating the handle.
If a circuit breaker is to be removed from its compartment for
an extended period of time, it is strongly recommended that a
future breaker cassette barrier (Figure 3.17) and future
breaker door cover (Figure 3.18) be installed to keep any
potential electrical arcing events contained within the
equipment. Refer to Table 6-2 for future cassette and door
covers.
Behind the circuit breaker compartment door is a dead front
gasket (Figure 3.17). When the compartment door is closed,
the combination of the dead front gasket and the breaker
door gasket (Figure 3.17) provides the necessary sealing for
the arc resistant rating.
WARNING: The breaker compartment door must be
closed and latched to maintain the integrity of the arc
resistant enclosure. The breaker compartment door should
not be opened when the circuit breaker is closed and in the
connected position when the equipment is energized.
WARNING: When a circuit breaker is removed from its
compartment. The future cassette barrier and the future
breaker door cover must be installed and the circuit
breaker compartment door closed and latched to maintain
the integrity of the arc resistant enclosure.
CAUTION: If the dead front gasket of the breaker door
gasket is damaged, these components should be replaced
to ensure the integrity of the arc resistant enclosure.
Future Circuit Breaker Compartment
When specified, compartments may be supplied for future
addition of circuit breaker elements. These compartments
are fully equipped with draw-out rails, primary disconnects,
and ancillary devices as required (i.e. secondary disconnects,
accessory devices, etc.).
The opening in the breaker compartment door and the
opening in the cassette of the compartment are closed with
bolted-on steel plates to deter accidental contact with
energized electrical circuits (i.e. primary disconnect stab tips)
and provide the necessary closing to achieve the arc resistant
rating (Figure 3.17 and Figure 3.18).
Figure 3.17 Breaker compartment door (opened)
(1)
Dead Front Gasket
(2)
Breaker Door Gasket
(3)
Self-latching Mechanism
(4)
Future Breaker Door Cover
(5)
Future Breaker Cassette Barrier
Figure 3.18 Breaker compartment door (closed)
(1)
Push to Latch Area
(2)
Future Breaker Door Cover
