20
S&C Instruction Sheet 662-510
Switching with Uni-Rupter
®
Interrupters
Opening and Removing the Fuse
Before proceeding with the instructions on opening and
removing the fuse, refer to the “DANGER” message on
page 7.
WARNING
Always use a Grappler Handling Tool attached to
a suitable universal pole to install, remove, open,
or close a fuse. No other tools are recommended.
Failure to use the proper tools can result in
damage to the equipment, flashover, and injury.
Grappler Handling Tool
Talon
Handling Tool
Distribution
prong
Station prong
Use Grappler Handling Tool (S&C catalog number
4423R1) attached to and in line with a suitable universal
pole
●
to perform following procedures:
STEP 1.
Open the appropriate fuse-compartment door
and secure it with the door holder. See Figure 16
on page 16. On double-door models, the adjacent
door should be closed and latched to minimize
exposure to high voltage.
STEP 2.
If optional inner barrier panels (catalog number
suffi x “-G7”) are furnished, loosen the pentahead
bolts and remove the panel.
Then, remove only the dual-purpose front
barrier associated with the fuse to be opened
using the Grappler tool for this purpose. See
Figure 17 on page 16.
STEP 3.
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
pull-ring of the fuse. See Figure 23.
If the space is tight between the pull-ring of
the fuse and an interphase or end barrier, it’s
acceptable to attach the Grappler tool to the
pull-ring with the prong pointed up. See lower
inset of Figure 23.
●
Use a universal pole 1¼ inches (31.8 mm) in diameter and at least
6 feet (1829 mm) long (S&C catalog number 4452R2-E, or equal) for
14.4-kV gear; or at least 8 feet (2438 mm) long (S&C catalog number
4453R2-E, or equal) for 25-kV gear.
Figure 23. A Grappler tool, as positioned for an opening stroke.
Preferred
Acceptable
