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MIL-M-17413A(NAVY)
Group 3:
Spray tight fan-cooled.
Watertight fan-cooled.
Totally enclosed fan-cooled.
Group 4:
Explosionproof.
Group 5:
Explosionproof fan-cooled.
Group 6:
Submersible, all degrees.
If the manufacturer desires he may submit a motor frame of less than the longest
core length to the shock test. However satisfactory conformance with the shock
requirements will give approval only to motors having a core length equal to or
less than the core length of the motor tested.
(i) Disposal of shock-tested motors. -
. . Motors which have been subjected to the high-impact shock test and
have failed to conform to the requirements will not be acceptable,
either in whole or any of the parts.
(2) Motors which have been subjected to the high-impact shock test and
have successfully passed this test shall be considered acceptable
under the contract or order provided the post-shock tests specified
hereinafter are satisfactorily passed and provided the mechanical
corrective measures specified hereinafter are satisfactorily met.
Continuous duty motors shall be subjected to a full-load heat run
test of 2 hours duration. Intermittent, varying and short-time duty
motors shall be subjected to a heat run test corresponding to but not
exceeding the specified rating of the motors. All motors shall be
given an insulation resistance test and a dielectric strength test in
accordance with 4.2.4.15 and 4.2.4.22 (d) (7), respectively,
Mounting flanges connecting directly to the driven auxiliary shall be
replaced in the event of minor deformation. Minor deformations
affecting alignments with the auxiliary, shall be corrected. Minor
deformations shall be defined as those which do not cause unqualified
rejection of the design under the high-impact shock test but which are
in excess of the dimensional tolerances specified on the applicable
motor drawings.  A "substandard" plate will not be required. Prior
to acceptance of the motor, all ball bearings shall be replaced.
4.2.4.23 Speed-voltage test. - Set field current for full load nominal voltage rating of the motor.
With no adjustment of the field rheostat setting as per above, record, no load and full load speed at
nominal voltage and the extremities of the voltage range.
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