627-500 22
INSTALLATION
(c)
For copper terminal pads to aluminum
connectors,
use
¹⁄₂
-inch galvanized steel
hardware with one Belleville washer (not
furnished) against the aluminum connec-
tor and one galvanized steel or brass fl at
washer against the copper terminal pad
as shown in Figure 18, Detail A. If the Bel-
leville washer extends beyond the edge of
the aluminum connector, the positions of
the Belleville washer and fl at washer should
be reversed, i.e., place the Belleville washer
against the copper terminal pad and the fl at
washer against the aluminum connector.
Tighten aluminum bolts to the manufac-
turer’s specifi cations. Tighten steel bolts to
50 foot-pounds using a torque wrench. If a
torque wrench is not available, tighten until
the Belleville washers are fl at, and then back
off one-half turn. Do not use lockwashers
with Belleville washers.
(d)
For copper terminal pads to tinned-cop-
per or tinned-bronze connectors,
use
¹⁄₂
-inch Everdur or stainless-steel hard-
ware, with one galvanized steel or brass
fl at washer against each terminal and one
split lockwasher under the nut as shown in
Figure 18, Detail B. Tighten the bolts to
35 foot-pounds using a torque wrench. If a
torque wrench is not available, tighten each
bolt until the split lockwasher is fl at.
Figure 18. Terminal pad connections for copper terminal
pads.
Copper
connector
Belleville
washer
Copper
terminal pad
Flat
washers
Aluminum connector
Copper
terminal pad
Flat
washer
Detail A,
for copper terminal pads to
aluminum connectors
Detail B,
for copper terminal pads to tinned-
copper or untinned-bronze connectors
