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RESET
BUTTON
Fig.
80 Blown Limiter Indicator
9.3.2 Replacing Fuses
LEVERING
Cutler-Hammer type NCL fuses are normally provided
when the fuse truck is built unless otherwise specified.
However, any Class L current limiting fuse
of
the proper
current rating can be used as a replacement.
After the fuse truck has been withdrawn from the com-
partment, the fuses can be removed by unbolting them
from the conductors on the fuse truck. This is a relatively
uncomplicated procedure on the DS-4000 fuse truck
because there is sufficient working space within the
truck. However, because the DS-3200 fuse truck is more
restricted
in
space it will facilitate the operation if the front
cover and levering mechanism is first removed from the
truck. See Figure 83.
After replacing fuses, be sure that all connection bolts are
tight and that any truck parts removed
in
the process
have been replaced.
1.8. 33-790-11
Fig.
81
DS-3200 Fuse Truck Front View (391081)
9.3.3 Blown Fuse Indicator
The same Blown Fuse Indicator is provided
on
fuse
trucks as
on
DSL circuit breakers. However, since there
is no opening mechanism on fuse trucks, it cannot serve
directly as
an
anti-single phase device. In order to per-
form this function, the Blown Fuse Indicator is arranged
to mechanically operate a switch, which is wired to sec-
ondary contacts on the fuse truck. The switchgear
assembly wiring must be arranged to connect this switch
into the tripping circuit
of
the associated circuit breaker.
See Figure 83. Again, the indicator must be reset after
being operated to reset the switch; or its contact will pre-
vent the breaker from being closed.
Effective October 1998
Courtesy of NationalSwitchgear.com
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