Rockwell Automation Publication 2100-IN012G-EN-P - August 2016
45
Installing Conduit and Cable
Chapter 3
Lugs
To install the lugs, follow this procedure.
1. Verify the compatibility of wire size, type, and stranding versus the
power lugs furnished.
Use correct lugs in all applications.
2. Crimp compression lugs with manufacturer recommended tools.
3. Use the MCC electrical schematics to verify field wiring connection
points.
Incoming Line Compartment
Top or bottom entry to the incoming line-section bus is straight through to the
connection terminals. The vertical bus provides pads for the incoming lugs.
Base the lug selection on the size, number, and type of conductor.
• Use of mechanical screw-type lugs is acceptable only when the incoming
lines’ available short-circuit current is 42,000 A rms symmetrical or less.
• Use of crimp or compression type lugs is acceptable when the incoming
lines’ available short-circuit current does not exceed 100,000 A rms
symmetrical.
Main Disconnect
Top entry is straight through to the line side of the main fusible disconnect or
main circuit breaker. For bottom entry, the connection scheme varies
depending on the rating of the main device. In some cases, the bottom entry
connects to the top or line side of the main fusible disconnect or main circuit
breaker. In other cases the connection is reverse-fed, the bottom entry cables
connect to the bottom of the main fusible disconnect or main circuit breaker.
For further information refer to Mains and Incoming Lines Dimension
Reference, publication
Mechanical screw-type lugs are supplied as standard with all main fusible
disconnects or main circuit breakers. Crimp or compression lugs are optional.