4.28 DESIGN REQUIREMENTS FOR ELECTRIC MOTORS AND ACCESSORY
EQUIPMENT
4.28.1 Definitions:
4.28.1.1 Electric Motor: A device, which converts electrical
energy into mechanical energy, imparting torque to a mechanical
power transmission drive system.
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4.28.1.2 Accessory Equipment: For the purpose of this standard,
accessory equipment are those mechanical torque converting
devices which are attached (closed) to the electric motor,
such as a gear head, speed changing device, clutch, or brake.
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4.28.1.3 Totally Enclosed Motor: A motor that prevents the
free exchange of air into or out of the motor housing.
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4.28.1.4 Totally Enclosed Non-ventilated Motor: A motor without
an integral fan or fans, external to the housing.
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4.28.1.5 Totally Enclosed Fan-cooled Motor: A motor cooled
with a fan or fans, integral with the motor but external to
the housing.
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4.28.1.6 Explosion-proof Motor: A totally enclosed motor capable
of withstanding an explosion within the motor housing and one
that cannot cause ignition of external gas, vapor, or dust
through sparks, flashes or internal housing explosions.
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4.28.1.7 Wash Down Motor: An electrical motor that is designed
to be washed with water without any changes in operating characteristics.
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4.28.1.8 Easy Clean Motor: An electric motor that has been
designed and built to reduce obstructions to cleaning, as far
as operation and economics allow, but not meeting the standard
completely. Easy clean can be washed down, if caustic solutions
are not used.
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4.28.2 Specific Design Requirements
4.28.2.1 Covers for cooling fans of totally enclosed fan-cooled
motors and accessory equipment shall be securely fastened and
removable for cleaning.
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4.28.2.2 The conduit box shall be sealed to, or integral with,
the frame.
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4.28.2.3 Mounting feet shall be designed and constructed so
that all joints of the support to the frame shall be free of
crevices. Non-toxic, permanently bonded filler material may
be used to eliminate crevices.
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4.28.2.4 Breather assemblies shall be removable and readily
accessible and shall prevent the passage of foreign material.
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4.28.3 Application Requirements for Motors and Accessory
Equipment
4.28.3.1 Totally enclosed motors and accessory equipment shall
be specified.
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4.28.3.2 In hard to reach areas, wash-down or easy clean motors
should be considered.
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