14 S&C Instruction Sheet 663-500
STEP 6.
Before connecting the cable terminators to the
aluminum terminal pads, thoroughly wire-
brush aluminum contact surfaces to remove
any dirt or foreign materials as well as natural
surface oxides. Immediately coat both contact
surfaces to ½-inch (13 mm) beyond the joint
with a uniform layer of Penetrox® A. Then,
make the connections as follows. See Figure 8:
For aluminum connectors: Use ½-inch
aluminum or galvanized steel hardware with
two Belleville spring washers (not furnished) as
shown in Detail A of Figure 8. Before tightening
the connecting bolts, complete the installation
of optional cable guides (where applicable) by
following the cable-support manufacturer’s
instructions. Torque aluminum bolts to the
manufacturer’s specifications. Torque steel
bolts to 50 foot-pounds (67.79 N-m) or, in the
absence of a torque wrench, tighten each bolt
until the Belleville washers are flat. Then, back
off one-half turn. Do not use lockwashers with
Belleville washers.
For tinned copper or tinned bronze
connectors
●: Use ½-inch galvanized steel
hardware with one Belleville spring washer (not
furnished) against the aluminum terminal pad
and one galvanized steel flat washer against
the tinned connector as shown in Detail B of
Figure 8. Before tightening the connecting
bolts, complete the installation of optional cable
guides (where applicable) following the cable-
support manufacturer’s instructions. Torque
the bolts to 50 foot-pounds (67.79 N-m) or, in the
absence of a torque wrench, tighten each bolt
until the Belleville washer is flat. Then, back
off one-half turn. Do not use lockwashers with
Belleville washers.
● The use of untinned copper or bronze connectors is not recommended.
Figure 8. The terminal-pad connections.
Installation
Detail B
Belleville
spring
washers
Aluminum
terminal pad
Aluminum
connector
Belleville
spring
washer
Tinned copper
or tinned bronze
connector
Aluminum
terminal pad
Galvanized steel
flat washer
Detail A
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