MIL-DTL-917 Electric Power Equipment, Basic Requirements ForThis specification covers the basic requirements applicable to the design, materials, and construction of naval shipboard electric power equipment \(exclusive of communication equipment, information technology \(IT\) equipment, and combat systems [fire control and weapons control equipment]\). Unless otherwise specified herein, the electric equipment developed for shipboard use under the requirements of this specification are limited to a maximum 450 volt \(V\) alternating current \(AC\) and a maximum 1,000 V direct current \(DC\). This equipment is intended for use on surface and submarine naval vessels \(see 6.2\).

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MIL-DTL-917F(SH)

LIST OF TABLES

TABLE

PAGE

I. Temperature ranges ambient ................................................................................................................................... 20

II. Size of mounting holes........................................................................................................................................... 20

III. Electrical creepage and clearance distance ........................................................................................................... 23

IV. Bolt and hole dimensions ..................................................................................................................................... 24

V. Maximum concentration of toxic gases ................................................................................................................. 28

VI. Material resistance to burning .............................................................................................................................. 29

VII. Molding compounds (glass fiber reinforced) ...................................................................................................... 32

VIII. Molding compounds (thermoplastic material) ................................................................................................... 33

IX. Insulation system classes (limiting temperatures) ................................................................................................ 34

X. Ground insulation .................................................................................................................................................. 35

XI. Spacers ................................................................................................................................................................. 36

XII. Slot-wedges (non-metallic) ................................................................................................................................. 37

XIII. Varnish............................................................................................................................................................... 38

XIV. Treating guidelines, armature coils, armatures, stators, and field coils ............................................................. 40

XV. Lead wire ............................................................................................................................................................ 41

XVI. Hook-up wire ..................................................................................................................................................... 42

XVII. Wire.................................................................................................................................................................. 42

XVIII. Square and rectangular insulated magnet wire sizes available to naval repair activities ................................ 43

XIX. Application stress limits and derating factor for rectifiers, SCRs 1/, GTOs 1/, bipolar transistors,

and IGBTs 2/. .............................................................................................................................................................. 47

XX. Indicator style and specifications ........................................................................................................................ 54

XXI. Processing of metals for corrosion resistance treatments where painting is not required.................................. 59

XXII. Painting of metal for corrosion resistance ........................................................................................................ 60

XXIII. Solder for connection of electrical windings................................................................................................... 62

XXIV. Conformance inspections................................................................................................................................ 70

XXV. Classification of defects ................................................................................................................................... 71

A-I. Specimens for insulation suitability test.............................................................................................................. 83

A-II. Insulation suitability test 100 percent relative humidity plus dew (sample) ...................................................... 86