18
S&C Instruction Sheet 662-510
Switching with Uni-Rupter
®
Interrupters
STEP 5.
If a dual-purpose front barrier is in the
“Slide-in”
posi tion, use the Grappler tool to
remove it. See Figure 21.
DANGER
Because there is always the possibility of
closing the fuse into a faulted circuit, and
because the closing operation is completely
operator-dependent (with no assist from
a quick-make mechanism), the clos
ing
operation must be accomplished with a
swift, unhesitating stroke while turning
one’s face away. When so operated, the
Uni-Rupter Interrupter associated with the
fuse is capable of closing into a fault current
once or twice, as specified in Appendix B
on page 27, remain ing operable and able
to carry and interrupt
rated current.
STEP 6.
With the Grappler tool’s prong pointed
downward (preferred), insert the prong into the
pull-ring of the fuse. Rotate the hookstick
clockwise slightly to ensure full and complete
engagement of the Grappler tool’s prong with
the pull-ring of the fuse. See inset of Figure 22
on page 19. Then, with one’s face turned away,
close the fuse with a swift, unhesitating stroke.
See Figure 22 on page 19.
If space is tight between the pull-ring of the
fuse and an interphase or end barrier, it’s accept-
able to attach the Grappler tool to the pull-ring
with the prong pointed up. See lower inset of
Figure 22 on page 19.
STEP 7.
Remove the Grappler tool from the pull-ring.
STEP 8.
After removing the Grappler tool from the pull-
ring, make sure complete fuse closure was
attained by pushing against the fuse, below the
upper end-fi tting, with the Grappler tool.
WARNING
Fail
ure to completely close the fuse
may result in dam age to the Uni-Rupter
Interrupter, flashover and injury.
STEP 9.
Use the Grappler tool to hang the dual-purpose
front bar rier in its normal, suspended position.
See Figure 17 on page 16. Also install the
optional inner barrier panel, if fur nished.
STEP 10.
Close and latch the doors and install a padlock.
Pull on the doors to verify they are securely
latched.
Figure 20. A fuse installed in mounting in the Open position.
Figure 21. Removing dual-purpose front barrier from the
“Slide-in” position using a Grappler tool.
