17
Type WL Low Voltage Metal-Enclosed Switchgear
Electrical Connections
Primary Connections
Bus Bars and Connectors
Horizontal bus bars, risers and various connectors are fabricated
using silver-plated copper bus bar as a standard and available in
tin-plated copper as an option. Typical bus arrangement is as
illustrated in Figure 15.
When copper bus is provided, all joints are of bolted construc-
tion, and completely assembled at factory except for shipping
split splices and termination points to other equipment. Contact
areas are silver-plated or tin-plated and may be coupled to tin-
plated bus bars or silver-plated bus bars.
Bolted Bus Joints
When bus joints are field assembled, the following procedure
shall be used.
1. All surfaces must be free of dust dirt, and other foreign
material.
2. Do not use any abrasive cleaner on plated contact
surfaces. Cleaning normally is not necessary and should
not be done unless parts are badly tarnished. If cleaning
is necessary, use a mild cleaner and thoroughly rinse
parts to remove all residue.
3. Assemble all joints with parts dry. Do not use any grease
or oxide inhibiting compounds.
4. Refer to Figures 16, 17 and 18 for method of bolting
joints, and follow hardware tightening instructions which
follow.
5. Horizontal main bus joints with two or four laminations
of through bus (Figures 17 and 18) may be serviced as
follows:
a. Remove four bolts, splice plate and shim plates
(Step 2).
b. Torque inner bolts (Step 1) with a long 3/8” hex bit.
Move sliding nut plate on inside of “C” beam to left to
torque left side inner bolts. Move sliding nut plate to
right to torque right side inner bolts.
c. Reinstall outer four bolts, splice plate and shim plates
and torque.
Figure 15. Typical Bus Bar Arrangement
DANGER
Hazardous voltage.
Will cause death or
serious injury.
Keep out.
Qualified personnel only.
Disconnect and lock off all power before
working on this equipment.
Courtesy of NationalSwitchgear.com
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