S&C ELECTRIC COMPANY
s
INSTRUCTION SHEET
663-503
Page 13 of 35
August 14, 1995
Ç
WARNING
Do
not
leave dual-purpose front barriers in the “slide-in”
position for more than one week. These barriers are in-
tended for temporary use to isolate the blades of the
Mini-Rupter Switch from the main contacts while work
is being performed. If the barriers are left in the “slide-
in” position for an extended period of time, there is the
possibility of corona discharge to the barriers.
Pro-
longed exposure to corona discharge can damage
the barriers and result in a flashover, injury, and
equipment damage.
Ç
NOTICE
Before closing a Mini-Rupter Switch, remove the dual-
purpose front barrier from the “slide-in” position.
Closing a switch on the barrier will block the
switch blades and result in a stalled condition.
If the Mini-Rupter Switch is closed with the front bar-
rier in the “slide-in” position, the switch blades will be
blocked and the stored-energy operator will stall in a par-
tially closed position. To correct this condition, follow the
directions under “IF OPERATOR STALLS . . .” on page 26.
To restore the dual-purpose front barrier to the normal
suspended position, use an S&C Grappler attached to a
suitable universal pole. Slowly and carefully withdraw the
barrier with the Grappler prongs pointed upward (as
shown in Figure 10) so that, as it clears the “slide-in” posi-
tion, the holes in the barrier catch on the hooks on the
gear. Then lower the barrier to its normal, suspended
position. (If, for any reason, the barrier was completely
removed from the enclosure, a suggested method of plac-
ing it in its normal, suspended position is shown in Figure
11. Note that the barrier is supported on the Grappler
prongs and held there by engagement of the lifting ring
with the Grappler cone. Place the barrier on the hooks of
the gear, and lower the barrier to its suspended position.)
Figure 10. Grappler, after lifting and pivoting the barrier, is
used to lower it into the “slide-in” position. Also shows
Grappler being used to return the barrier to its normal,
suspended position.
MINI-RUPTER SWITCHES — Continued
