Motor control centers are not designed to be
placed in hazardous locations. The area chosen
should be well ventilated, 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). For indoor locations,
protection from moisture or water entering the
enclosure must be provided.
Motor control centers should be located in an area
which allows a minimum of three feet of free space
in front of front-of-board construction. An
additional three feet should be allowed in the rear if
the sections are back-to-back construction. This
free space will give adequate room to remove and
install units. A minimum of 1/2" (13 mm) space
should be provided between the back of front-of-
board motor control centers and a wall (6" ( 152
mm) for damp locations).
When selecting a location for the installation of a
motor control center, careful attention should be
given to accessibility, overhead clearances, and
future expansions. Consideration of these factors
installation of this and future motor control centers.
Motor control centers are assembled in the factory
on a smooth level surface to insure that all
sections are properly aligned. A similar smooth
and level surface should be provided by the
customer for installation. An uneven foundation
may cause misalignment of shipping blocks, units
and doors. The surface under a motor control
center must be of a non-combustible material
unless bottom plates are installed in each vertical
Section Preparation for Splicing
WARNING: There is a hazard of electrical shock
or burn whenever working in or around electrical
equipment before working on it.
Before positioning the motor control center
sections, check for damaged bus bars and
insulators If the bus is bent or insulators are
broken, do not install the motor control center.
Report any damage to the carrier.
To mount and splice a new motor control center
section to an existing section, or to loin factory
shipping splits, the following steps must be taken.
When sections do not require splicing, skip to
installation Procedure I-6, page 6.
NOTE; The splice bar feature is designed for
assembly from the front of the motor control
center. It is not necessary to remove back plates
or top plates Back-plates on 20" (508 mm) deep
sections may be removed to bolt structures
together. No attempt should be made to remove
the riveted back plate of a 15" (381 mm) deep
Remove the topmost blank space cover or unit
from Section R Also remove the unit door on
Section R to avoid open door obstruction.
NOTE Units are held in place with mounting
screws located in the back of the unit Control
station plates holding the pushbuttons, selector
switches, pilot lights and reset buttons must be
removed from the unit door before removal of the
unit is attempted.