Rockwell Automation 2100 Installing Ground Bus and Connectors - Manual (Page 3)

Publication 2100-IN031B-EN-P - March 2003
CENTERLINE Motor Control Centers 3
Installing the Unit Load
Ground Connectors See Figure 2 when installing the unit load ground connectors.
1. If a vertical bus was installed, replace the unit support pans.
2. Attach the unit load ground connectors to the vertical bus at the first
hole above the unit support pans. Use 1/4-20 x 1/2” thread-forming
screws to bolt the connectors in place.
NOTE: SC-I units with the unit load ground connector will also have a 1/
4-20 x 5/8” hex head screw, 1/4” lock washer, and 1/4-20 hex nut. These
should be used instead of the thread-forming screw if an older version of the
vertical bus, with clearance holes, is in the section. Torque the screws to 50
lb.-in. (5.7 N-m).
3. Bolt the #14 - #4 AWG lug to the unit load ground connector with the
1/4-20 x 5/8” hex head screw, 1/4” lock washer, and 1/4-20 hex nut.
Assemble as shown in Figure 2.
4. Replace all units and the horizontal wireway cover.
Figure 1 Splicing a Vertical Unit Load Ground Bus to a Horizontal Ground Bus.
NOTE: Illustration only shows the lower portion of the vertical bus, for a
bottom mounted horizontal ground bus.
c
Vertical unit load ground bus (1)
d
Splice link (1)
e
1/4-20 x 1/2” thread-forming screw (16) in
total kit
NOTE: These parts are only included when a
vertical unit load ground bus and unit load
connectors are supplied (catalog numbers
2100-N79L and 2100-N79LT)
Horizontal Wireway Baffle
FRONT
e
Horizontal Ground Bus
d
c