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39
Operation
01.4IB.51000C
Use only the racking tools provided by Powell
for inserting and removing the circuit breaker.
The use of other tools such as electric drills,
impact drills, etc., may damage the racking
mechanism and render it inoperative.
!
CAUTION
Before inserting the circuit breaker into the
compartment, be sure that the racking crank
arms of the circuit breaker are in the fully
withdrawn position, pointing towards the
movable primary disconnects. Otherwise, the
primary disconnects, shutters, or the racking
mechanisms may be damaged.
CAUTION
Before racking a circuit breaker in or out
of the compartment, make sure that the
key interlock is unlocked and in the opened
position. Otherwise, the racking mechanism
may be damaged.
CAUTION
With the three optional methods of racking,
the front door of the compartment has
an opening, which enables the racking
procedure to be performed. This opening
is covered by a teardrop cover which
automatically closes by gravity when the
racking handle is removed. The metal-clad
switchgear door is also provided with other
options, such as a viewing window, and
an internal light which will allow viewing
the breaker position indicator (Figure 5, c)
located on the circuit breaker to be viewed.
Figure 27 Closed Door Racking
A further option to closed door racking
is closed door tripping. If this option is
furnished, a mechanical trip button on the
door operates a mechanism within the
compartment, which trips the removable
element.