TM 5-3895-374-24-1
EQUIPMENT MUST BE DE-ENERGIZED DURING ALL INSTALLATION AND
WHICH MAY RESULT IN ELECTRICAL SHOCK AND/OR BURN.
GENERAL
Introduction
WARNING: There is a hazard of electric shock or
burn whenever working on or around electrical
equipment.
Turn
off
power
supplying
this
equipment before working inside motor control
centers.
G-1
The
operation
of
motor
control
centers
is
dependent upon handling, installation, operation
and maintenance by qualified personnel, as well as
upon proper design and manufacture. Failure to
follow
certain
fundamental
installation
and
maintenance requirements could lead to personal
injury and the failure and loss of the motor control
center as well as damage to other property
For the purpose of this guide, a qualified person is
one
who
is
familiar
with
the
installation,
construction and operation of the equipment and
the hazards involved. He should be:
a. Trained
and
authorized
to
energize,
de-
energize, clear, ground, and tag circuits and
equipment in accordance with established
safety practices
b. He should also be trained in the proper care
and use of protective equipment such as rubber
gloves, hard hat, safety glasses or face shields,
flash
clothing,
etc.,
in
accordance
with
established safety practices.
Description
G-2
Motor Control Centers provide the most suitable
method for grouping electrical motor control and
other related devices in a compact, economical,
free-standing installation. A motor control center is
made of standardized vertical sections consisting
of totally enclosed, dead front, free-standing
structures bolted together. These sections support
and house control units, a common bus bar for
distributing power to the control units and a
network of wire trough and conductor entrance
areas for accommodating out-going load and
control wires.
The control units consist of components such as
combination motor starters, branch feeder devices
or lighting panelboards. Each is mounted in an
individual, isolated compartment having its own
cover. When front-of-board unit arrangement is
selected, all units are mounted on the front side of
the control center. A 15" (381 mm) deep, 20" (508
mm) wide section is provided for front-of-board,
although a 20" (508 mm) deep, 20" (508 mm) wide
front-of-board structure is also available. Larger
sections
are
available
for
mounting
larger
equipment.
When back-to back arrangement is selected, the
units are mounted on both the front and rear of the
control center A 20" (508 mm) deep, 20" (508 mm)
wide
section
is
provided
for
back-to-back
arrangement. The standard height of all motor
control center structures is 91 ½" (2324 mm).
Packaging
G-3
Motor control centers are constructed in shipping
blocks of three vertical sections maximum. This
allows for ease in handling during transportation
and installation. The main horizontal bus of all
shipping blocks is spliced together at the jobsite
with the use of splice bars.
Before being packed for shipment from the factory,
the motor control center is inspected visually,
electrically and mechanically by a professional
Quality Control Analyst. Certification of Quality
Control testing is available upon request.
After leaving Quality Control, each shipping block
is carefully packaged and attached to a skid.
Inspection
G-4
Inspect the motor control center for any damage
as soon as it is received. Delivery of the
equipment to a carrier at any of the Square D
Plants or other shipping point constitutes delivery
to the purchaser. Title and all risk of loss or
damage in transit shall pass to the purchaser at
that time, regardless of freight payment.
All claims for loss and damage must be made by
the purchaser to the carrier.
The packaging material should be replaced for
protection until installation is begun.
(page 3-120)
DANGER
