Publication 2100-IN012B-EN-P - April 2005
General Information 1-3
Motor Control Center
Sequence Numbering
CENTERLINE Motor Control Centers are designed so functionality is not
affected by the section installation order, i.e. vertical section numbering
sequence order.
All MCC sections carry a serial plate which identifies vertical section sequence
numbering, e.g. MCC section 1 of 1, 1 of 5, etc. See Figure 1.3.
Figure 1.3 Section Nameplate
Sections are numbered to match factory-supplied MCC elevation drawings.
Numbering each section helps installers and users easily identify motor control
centers, sections and units. If there are questions about section numbering
during field installation, inspection or operation, the following instructions can
provide guidance on equipment acceptability, listing and certification.
CENTERLINE MCC sections can be installed or added as follows:
1. In non-sequential order
2. Addition of a single section (add-on section)
3. Addition of multiple sections (add-on lineup of sections)
4. 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, i.e., 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, motor control centers should be installed in sequential order.
Installing MCCs in sequential order helps ensures proper installation and
ensures that factory-supplied documentation matches the equipment.
Identifies Vertical Section
Sequence Numbering
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