Rockwell Automation 2300 Family of Drive Systems Hardware - Manual (Page 52)

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Splicing Control Busbars Follow the procedures contained in this section to join the two halves of
both control busses in ever pair of MCCs that needs to be spliced together.
The following table will help you to determine the type of control bus splice
that needs to be installed. This table addresses the various bus
configurations available in a 20-inch-deep MCC, the most popular depth
used by Rockwell Automation Drive Systems.
If: Then go to:
Both ends of the control bus to be joined are at a
depth of either 11.92 inches (303 mm) or
16.92 inches (430 mm): Installing Straight Control Bus Splices
One end of the control bus to be joined is at a depth
of 11.92 inches (303 mm); the other,
16.92 inches (430 mm): Installing Offset Control Bus Splices