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Model 6 Motor Control Centers 80459-641-01E
Section 4—Installing the MCC 10/2012
© 1999–2012 Schneider Electric All Rights Reserved 18
ENGLISH
Section 4—Installing the
MCC
This section explains how to locate, install, and join Model 6 MCC
enclosures, and how to splice power and ground bus. Refer to MCC front
elevation drawings supplied by Schneider Electric for location/placement of
shipping splits/sections within each MCC line-up. For information related to
removing and installing existing and new units, see “Section 10—Expansion”
on page 92, or the information included with the shipment of the new device.
Locating the MCC
MCCs are designed for use in non-hazardous locations. Choose a location
for installation that is well ventilated and free from excess humidity, dust,
and dirt. The temperature of the area should be no less than 0 °C (32 °F)
and no greater than 40 °C (104 °F). Protect the enclosure from the entrance
of water or any moisture.
Space Requirements
Install MCCs in an area with a minimum of 3 ft. (914 mm) of free space in
front of front-of-board construction. An additional 3 ft. (914 mm) is
necessary in the rear of back-to-back construction. This free space provides
adequate room to remove and install units. (More space may be required for
some applications; refer to applicable local and national installation codes.)
Provide at least 0.5 in. (13 mm) of space between the back of front-of-board
MCCs and a wall. For damp locations, provide at least 6 in. (152 mm).
When selecting a location for the installation of an MCC, carefully consider
accessibility, overhead clearances, and future expansions. Considering
these factors will eliminate many difficulties during this and future MCC
installations.
NOTE: Model 6 MCCs with the arc-rated option have pressure-relief roof
flaps for top venting of arc fault gases. These MCCs require a minimum of
28.5 in. (724 mm) from the top plate of the MCC to the nearest obstruction
(minimum ceiling height of 120 in. (3048 mm) including base channel). See
the special hazard statement on page 19 concerning the required clearance
above the equipment.
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.
• When moving MCC sections, follow the instructions in “Handling the
MCC” on page 15. The MCC has a high center of gravity, which may
cause it to tilt.
Failure to follow this instruction will result in death or serious injury.