Rockwell Automation 2500 CENTERLINE Motor Control Centers Installation Manual - Manual (Page 47)

Rockwell Automation Publication 2500-IN001C-EN-P - April 2014 47
Install Cable Chapter 4
Incoming Line Lug
Compartment Top or bottom incoming line lug compartments are available. Base the lug
selection on the size, number and type of conductor.
The following are guidelines for selecting lugs based on incoming line available
short circuit current,
I
sc
.
I
sc
≤ 50,000 amperes RMS symmetrical use mechanical screw or
crimp/compression type lugs.
I
sc
> 50,000 amperes RMS symmetrical crimp/compression type lugs are
recommended.
Main Disconnecting Means Refer to the documentation package shipped with your MCC for information on
incoming terminations.
For main disconnects or circuit breakers, use the lugs provided.
Cable Bracing The CENTERLINE 2500 MCC bus work system has been tested and is
qualified to withstand forces that exceed the short circuit withstand ratings for
the MCC. Incoming line cables and outgoing feeder cables also need to be
supported to withstand the same short circuit forces. Follow appropriate codes
and standards when bracing incoming and outgoing cables.
There are many sizes and types of cables, as well as different means by which the
cables can be supported. Cabling needs to be secured or braced for the weight of
the cable and in case of a fault.
Follow the guidelines addressed in IEC Standard 60364-5-52.