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Model 6 Motor Control Centers 80459-641-01E
Section 10—Expansion 10/2012
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ENGLISH
Section 10—Expansion
The modular design of MCCs permits easy expansion to keep pace
with an expanding electrical system. When space is available in the
existing MCC, starter units can easily be added. When no more starter
unit mounting space is available, vertical sections can be added to provide
additional space. All prepared spaces or leftover spaces must be filled with
arc-rated empty units on arc-rated Model 6 MCCs.
Starter units may be rearranged or replaced with larger units. In most cases, a
Size 2 starter unit can replace a Size 1 unit with no change in mounting space.
Ordering Information
NOTE: Arc-rated MCCs must only be expanded or added onto with
arc-rated units/sections to maintain the arc containment ratings. Arc-rated
units and sections have special labels identifying them as AR (arc-rated),
typically in the locations shown in Figure 114. Customer must provide the
previous arc-rated MCC factory order number when ordering additional
arc-rated MCC equipment from factory.
When ordering additional MCC equipment, include the following information:
•
Type of equipment being supplied
•
Supply voltage, frequency, system type
•
NEMA/EEMAC enclosure type
•
Enclosure finish
•
Control circuit voltage and frequency
•
Optional control circuit components required (control transformers, push
buttons, pilot lights, selector switches, etc.)
•
Special features
•
The factory order number of the original MCC (the number is stamped
into the structure nameplate on the vertical wire trough door; the unit
label inside each control unit also contains the factory order number)
When ordering new vertical sections, also provide the following information:
•
Horizontal and vertical bus capacity, material, and plating
•
Bus bracing (or available fault current)
•
Enclosure dimensions
Figure 114: Typical Arc-Rated Label
Locations on Sections and Units
= Arc-rated Label
= MCC Section Nameplate
Arc-rated Label
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Apply appropriate personal protective equipment (PPE) and follow safe
electrical work practices. See NFPA 70E or CSA Z462.
• This equipment must only be installed and serviced by qualified
electrical personnel.
• Turn off all power supplying this equipment before working on or inside
equipment.
• Always use a properly rated voltage sensing device to confirm power is
off.
• Replace all devices, doors, and covers before turning on power to this
equipment.
Failure to follow this instruction will result in death or serious injury.