14 Publication 2100-IN012C-EN-P - April 2009
Chapter 1 General Information
MCC Sequence Numbering
CENTERLINE MCCs are designed so functionality is not affected by the
section installation order, for example, vertical section-numbering
sequence order.
All MCC sections carry a serial plate, which identifies vertical section
sequence numbering. For example, MCC section 1 of 1, 1 of 5, and so
on.
Section Nameplate
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.
Identifies Vertical Section
Sequence Numbering
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