Rockwell Automation 2100 CENTERLINE Low Voltage Motor Control Centers - Manual (Page 12)

12 Rockwell Automation Publication 2100-IN012E-EN-P - February 2012
Chapter 1 General Information
Sections are numbered to match factory-supplied MCC elevation drawings.
Numbering each section helps installers and users easily identify MCCs, sections,
and units. If there are questions about section numbering during field installation,
inspection, or operation, the following information can provide guidance on
equipment acceptability, listing, and certification.
CENTERLINE MCC sections can be installed or added as follows:
• In non-sequential order
• Addition of a single section (add-on section)
• Addition of multiple sections (add-on lineup of sections)
• Addition of single section or multiple section between MCC sections
If sections are added to an existing lineup and not installed in sequential order,
the installation should not be considered a misapplication or in conflict with
Underwriter Laboratories (UL) listing and Canadian Standards Association
(CSA) certification.
The paramount criteria for additions of sections to existing MCCs is matching
the horizontal bus electrical and ingress protection (enclosure type) ratings for
the total MCC line up. For example, the voltage, current rating, short circuit
withstand, and NEMA enclosure type (IP rating) for all sections must match.
Non-sequential numbering may not create a functional or listing/certification
issue. However, MCCs should be installed in sequential order. Installing MCCs
in sequential order helps ensure proper installation and ensures that factory-
supplied documentation matches the equipment.
You can rearrange MCC sections. However, if a section that uses a right-hand side
sheet with integral, internal mounting flanges is on the outside of a lineup, an
additional closing kit plate is required. Refer to CENTERLINE 2100 Motor
Control Center End Closing Plates Installation Instructions,
publication
2100-IN069 . MCCs that contain arc resistant features cannot use a
section with integral mounting flanges on the outside of a lineup.
UL/CSA Marking CENTERLINE MCCs are listed by Underwriter’s Laboratories, Inc. (UL),
Standard for Safety UL 845, and certified by the Canadian Standards Associate
(CSA), Standard C22-2, No. 14.
Due to standards harmonization, a MCC may also carry the cUL designation.
The cUL designation is comparable to CSA certification.
Vertical sections and units are labeled independently. It is possible to have
combinations of labeled and non-labeled sections and units in the same MCC.