S&C Instruction Sheet 662-510
13
Switching with Mini-Rupter
®
Switches
Figure 12. Dual-purpose front barrier for switch in its nor-
mal, suspended position.
Figure 13. A Grappler Handling Tool being used to lift the
barrier. Note the door holder is in place and the adjacent
door is latched closed to reduce exposure to high voltage.
Front Barriers
Before proceeding with the instructions on handling the
front barriers, refer to the “DANGER” message on page 7.
S&C recommends the dual-purpose front barrier be
inserted into the
“Slide-in”
position when the Mini-Rupter
Switch is open. When the barrier is in the
“Slide-in”
position, the switch blades are isolated from the main
contacts; moreover, the blades are blocked from closing
if, for any reason, the Mini-Rupter Switch is operated.
WARNING
Always use a Grappler Handling Tool attached to a
suitable universal pole to insert, remove, or replace
front barriers. 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
WARNING
Dual-purpose front barriers must be wiped clean
before placing them in the
“Slide-in” position. In
addi tion, do not leave dual-purpose front barriers
in the
“Slide-in” position for more than one week.
These bar riers are intended for temporary use only
to isolate the blades of the Mini-Rupter Switch from
the main con tacts while work is being performed.
If the barriers are left in the
“Slide-in” position for
extended periods of time, there is the possibility
of corona discharge to the barriers.
Prolonged
exposure to corona discharge may damage the
barriers and result in a flashover and injury.
To insert the barrier in the
“Slide-in”
position, use
an S&C Grappler Handling Tool, catalog number 4423R1,
attached to and in line with a suitable universal pole
●
.
Figures 13 and 14 through 15 on page 14 show the suggested
insertion method. The Grappler tool’s prong is pointed
upward when lifting the front barrier.
●
Use a universal pole 1
¼
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.
CAUTION
When ready to close the Mini-Rupter Switch, make
sure that the dual-purpose front barrier is not in the
“Slide-in” position.
