S&C Mark V Circuit-Switchers Installation Manual page 16

Installation
STEP 11� Check the alignment of the front-insulator stack
by means of a cord stretched taut across the top
of the insulator stacks. The cord should cross the
center points of all three insulator stacks and
the front insulator stack should not be canted. If
adjustment of the front-insulator stack is neces-
sary, follow the procedure described in Step 10
on page 15.
Mount the brain-and-interrupter assembly as
STEP 12�
follows:
(a) Place the drive-shaft crank in the fully Open
position (rotating-insulator stack rotated
counterclockwise).
34�5 kV through 69 kV:
½—13 X 1¼-inch hex head
galvanized steel cap
screws and lockwashers
115 kV through 161 kV:
5/8—11 X 1¼-inch hex head
galvanized steel cap
screws and lockwashers
Rear
insulator
stack
Figure 10� Braln-and-Interrupter assembly and jaw-contact assembly mounted on insulator stacks�
16 S&C Instruction Sheet 711-510
(b) Lift the brain-and-interrupter assembly into
position on its respective insulator stacks,
using the same handling care that was
cautioned for its removal. See Figure 10.
Be sure to place the brain-and-interrupter
assembly on the same pole-unit from which
it was removed.
(c) Install the cap screws (with lockwashers)
finger tight at both ends of the brain-and-
interrupter assembly. If necessary, loosen
the cap screws at the rotating-insulator
support. Make sure the cap screws are the
correct length. Screws longer than those
specified may bottom in the mounting holes
Brain-and-interrupter
assembly
Rotating
insulator
stack
Drive-shaft crank
(in open position)
Jaw-contact
assembly
Front
insulator
stack