S&C Instruction Sheet 712-501
25
Inspection Recommendations
Step 22
After checking the angle of the blades, check
the operation of the disconnect for proper
alignment of the blade with the jaw-contact
assembly .
a . As the disconnect is closed, the fault-clos ing
tongue contact should engage each of the
fault-closing jaw contacts with equal pres-
sure and the current-carrying tongue
contact should enter the current-carrying
jaw contacts with equal clearance on each
side .
b . The silver-surfaced area of the current-car-
rying tongue contacts should center
later ally with the silver-surfaced current-
carrying jaw contacts, and the blade should
rotate with slight pressure against the blade
bumper stop and come to rest either on the
stop or slightly above it . See Figure 29 .
NOTICE
If the blades do not make the correct angle,
or the contacts are not properly aligned
after leveling the disconnect bases, halt the
inspection and contact your local S&C Sales
Office .
Step 23
Manually close the Circuit-Switcher discon nect
and return the manual operating handle to its
storage position . Replace the motor and heater
circuit fuseholders .
Figure 29. Check penetration of the blade into the jaw contact during
closing.
Fault-closing
tongue contact
Fault-closing
jaw contacts
Blade
Current-carrying
tongue contacts
Current-carrying
jaw contacts
Blade bumper
stop (located
behind contacts)
Summary of Contents for Mark VI
Page 28: ...Printed in U S A ...
