Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE - Manual (Page 201)

Glossary-14
• Dust-ignition-proof Machine – is a totally enclosed machine whos
enclosure is designed and constructed in a manner which will exclude ignitabl
amounts of dust or amounts which might affect performance or rating, and
which will not permit arcs, sparks or heat otherwise generated or liberated
inside of the enclosure to cause ignition or exterior accumulations or
atmospheric suspensions of a specific dust on or in the vicinity of the
enclosure.
• Explosion Proof Machine – is a totally enclosed machine whose enclosure is
designed and constructed to withstand an explosion of a specified gas or vapor
which may occur within it and to prevent the ignition of the specified gas or
vapor surrounding the machine by sparks, flashes or explosions of the
specified gas or vapor which may occur within the machine casing.
• Totally Enclosed Air-over Machin – is a totally enclosed machine intended
for exterior cooling by a ventilating means external to the machine.
• Totally Enclosed Fan-cooled – is a totally enclosed machine equipped for
exterior cooling by means of a fan or fans integral with the machine but
external to the enclosing parts.
• Totally Enclosed Fan-cooled Guarded Machine – is a totally enclosed fan-
cooled machine in which all openings giving direct access to the fan are limited
in size by the design of the structural parts or by screens, grills, expanded
metal, etc., to prevent accidental contact with the fan. Such openings shall not
permit the passage of a cylindrical rod 0.75 inch in diameter, and a probe shall
not contact the blades, spokes or other irregular surfaces of the fan.
• Totally Enclosed Water-air-cooled Machine – is a totally enclosed machine
which is cooled by circulating air which, in turn, is cooled by circulating water.
It is provided with a water-cooled heat exchanger for cooling the internal air
and a fan or fans, integral with the rotor shaft or separate, for circulating th
internal air.
• Totally Enclosed Water-cooled Machine – is a totally enclosed machine
which is cooled by circulating water, the water or water conductors coming in
direct contact with the machine parts.
• Waterproof Machine – is a totally enclosed machine so constructed that it
will exclude water applied in the form of a stream from a hose, except that
leakag may occur around the shaft provided it is prevented from entering the
oil reservoir and provision is made for automatically draining the machine.
The means for automatic draining may be a check valve or a tapped hole at the
lowest part of the frame which will serve for application of a drain pipe.
Transient A momentary deviation in an electrical or mechanical system.
UL Underwriters Laboratories (an approval agency).
Work A force moving an object over a distance. Measured in inch-ounces (in.-oz.) o
foot-pounds (ft.-lbs.) . Work = force times distance.
Y Connection See Star Connection.