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MIL-M-17059A(SHIPS)
APPENDIX II
PROCEDURE FOR TESTING OF ENCAPSULATED MOTORS
10. SCOPE
10.1 Scope. - This appendix covers the suitability testing procedure for encapsulated motors.
10.2 Purpose. - The purpose of this test is to determine the insulation resistance, dissipation factor,
and capacitance of an electric motor encapsulation system under conditions of submergence.
10.3 Classification. - Insulation suitability tests for encapsulated motors shall be of the following types
and shall be so designated in the application for test:
Type R- Random winding (see 3.1.28.3).
Type F - Form winding (see 3.1.28.4).
10.4 Definitions. -
10.4.1 Insulation resistance. - The insulation resistance between two electrodes which are in contact
with, or embedded in, an insulating structure, is the ratio of the direct voltage applied to the electrodes to
the total current between them. It is dependent upon both the volume and surface resistances of the insula-
tion structure.
10.4.2 Dissipation factor. - The dissipation factor of an insulating structure is the ratio of its parallel
reactance to its parallel resistance. It is also the tangent of the loss angle (also called loss tangent) and
the cotangent of the phase angle.
10.4.3 Capacitance. - The capacitance is the ratio of the charge which can be stored in a capacitor to
the potential applied to it.
20. APPLICABLE DOCUMENTS
20.1 Not applicable.
30. REQUIREMENT'S
30.1 Reliability. - Reliability of operation shall be considered of prime importance in the design and
manufacture of the equipment. As encapsulated motors are usally specified to be used under extreme
moisture environmental conditions beyond the limitations of conventionally insulated motors, motors for
this service shall meet the performance-requirements specified herein.
40. QUALITY ASSURANCE PROVISIONS
40.1 Encapsulated motor suitability tests. -
40.1.1 Place of tests. - The encapsulated motor suitability tests shall be conducted at the manufac-
turer's plant or at a laboratory and under conditions satisfactory to the Bureau of Ships.
40.1.2 Equipment to be tested. - As it is not practical to test each encapsulated motor rating to deter-
mine compliance with the specification requirements, only a representative rating, typical of the line manu-
factured, need be tested. Table XVI lists equipment by horsepower and the type of sample to be tested.
40.1.3 Application for test. - Application for test shall be submitted to the Bureau of Ships, Code 660,
and shall include the following:
(a) Manufacturer's name and address.
(b) Test specimen rating and type of encapsulated motor winding.
(c) Availability of test facilities including manufacturer's name and designation or style number
for each equipment or instrument.
41

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