S&C Instruction Sheet 663-500 13
STEP 5.
Make up cable terminations following the cable-
terminator manufacturer’s instructions. While
the interior of S&C Pad-Mounted Gear is
protected from direct exposure to the elements,
the gear is inherently in an outdoor environment
and requires selection and application of cable-
terminating devices accordingly.
WARNING
Maintain proper clearances when
installing cable terminators . Failure to
maintain proper clearances can result in a
flashover, injury, and equipment damage .
To maintain the rated BIL, the following
minimum clearances are required . See
Figure 6 on page 12 .
• From energized parts to electrical
ground: 6 inches (152 mm) at 14 .4 kV;
7
½
inches (191 mm) at 25 kV .
• From energized parts to fiberglass-
reinforced polyester barriers: 1 inch
(25 mm) at 14 .4 kV; 2
¼
inches (57 mm)
at 25 kV .
• From terminator skirts to fiberglass-
reinforced polyester barriers:
½
inch
(13 mm) at 14 .4 kV; 1
¼
inches (32 mm)
at 25 kV .
Terminations must incorporate adequate
leakage distance between the exposed
conductor and the stress-relief cone,
across a surface of non-tracking material .
A surface can be rendered non-tracking by
properly taping it with a suitable material .
Two-position cable-terminator adapters
are provided at the fuse hinge assemblies. See
Figure 7. These adapters can be placed in their
alternate positions when required for increased
clearance from energized parts to grounded
parts of the cable terminators.
Switch terminal pads are furnished with
three mounting holes. In general, cable termina-
tors may be connected to the two lower holes in
the switch terminal pads. However, if the pad-
mounted gear includes optional cable guides for
switch terminals (catalog number suffix “-M2”)
or current sensors (catalog number suffix “-Y2”),
cable terminators must be connected to the two
uppermost holes in the switch terminal pads.
See Figure 5 on page 11.
Figure 7. The fuse assembly showing the alternate arrangement
of the two-position cable-terminator adapters.
Normal position for
maximum cable
terminating height
Alternate position
for use when
required for
electrical clearance
NOTICE
When connecting cable terminators,
avoid placing any intentional strain on
switch or fuse terminals . Do not use the
connecting bolts to pull the cables into
alignment . Place each connector flat
against the corresponding switch or fuse
terminal pad with the bolt holes aligned .
Failure to follow these precautions can
cause misalignment of the switch or fuse .
Installation
