16 S&C Instruction Sheet 662-510
Switching with Uni-Rupter
®
Interrupters
Storage rack
for S&C SMU-
20 Fuse Units
or SM-4 Refill
Units
S&C Grappler tool
in storage position
Door holder
Figure 16. Dual-purpose front barriers for fuses in their nor-
mal, suspended positions. Note the door holder is in place.
Installing and Closing the Fuse●
Before proceeding with the instructions on installing and
closing the fuse, refer to the “DANGER” message on page7.
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 a Grappler Handling Tool (S&C catalog number
4423R1) attached to and in line with a suitable universal
pole
■▲ to perform the following procedures:
STEP 1. Open the appropriate fuse-compartment door
and secure it with the door holder. See
Figure 16. On double-door models, the adjacent
compartment door should be closed and latched
to minimize exposure to high voltage.
STEP 2. If optional inner barrier panels (catalog
number suf x “-G7”) are furnished, loosen the
pentahead bolts and remove the panel.
Then, remove only the dual-purpose front
barrier asso ciated with the fuse mounting into
which the fuse is to be installed. See Figure 17.
Insert the barrier into the “Slide-in” position
using the Grappler tool, as illustrated in Figure
18 on page 17. Note the barrier is supported on
the Grappler tool’s prongs and held there by
engagement of the lifting ring with the Grappler
tool’s cone.
● Although the operations described in this section often refer sim ply
to “fuses,” the procedures apply to Type SML-20 and SML-4Z Power
Fuses, Fault Fiter Electronic Power Fuses, and current-limit ing fuses
used in Fault Fiter Electronic Power Fuse Mountings with Uni-Rupter
Interrupters.
■ 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.
▲ If the enclosure is furnished with an optional base spacer (or is
attached to a higher-than-normal mounting pad), it may be desirable,
for easier handling at the increased height, to reposition the Grappler
tool on the universal pole at a favorable angle.
Figure 17. Removing or replacing the dual-purpose front
barrier with the Grappler tool.
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