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)

PARAGRAPH

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3.9 Varnish treatment ............................................................................................................................................. 39

3.9.1 Baking ovens ............................................................................................................................................. 39

3.9.2 Baking time specified ................................................................................................................................ 39

3.9.3 Typical treating guidelines ........................................................................................................................ 39

3.10 Final condition ................................................................................................................................................ 40

3.11 Insulation suitability ....................................................................................................................................... 40

3.12 Wire, wiring methods, marking, and bus bars ................................................................................................ 41

3.12.1 Wire ......................................................................................................................................................... 41

3.12.1.1 Lead wire .......................................................................................................................................... 41

3.12.1.2 Hook-up wire .................................................................................................................................... 41

3.12.1.3 Magnet wire ...................................................................................................................................... 42

3.12.2 Wiring methods ....................................................................................................................................... 43

3.12.2.1 Harnessing ........................................................................................................................................ 43

3.12.2.1.1 Harnessing materials.................................................................................................................. 43

3.12.2.1.2 Lacing cord ................................................................................................................................ 43

3.12.2.1.3 Flexible wiring........................................................................................................................... 44

3.12.2.2 Slack ................................................................................................................................................. 44

3.12.2.3 Mechanical supports ......................................................................................................................... 44

3.12.2.3.1 Clamped connections ................................................................................................................. 44

3.12.2.4 External cable connections ............................................................................................................... 44

3.12.2.5 Protection of insulation..................................................................................................................... 44

3.12.2.6 Shielded wire .................................................................................................................................... 44

3.12.2.7 Stud terminals ................................................................................................................................... 44

3.12.2.8 Wire connections and terminals........................................................................................................ 45

3.12.2.8.1 Spare terminals .......................................................................................................................... 45

3.12.2.8.2 Soldered connections ................................................................................................................. 45

3.12.2.8.3 Electrical weld connections ....................................................................................................... 45

3.12.2.9 Permanent internal connections of windings .................................................................................... 45

3.12.2.10 Terminal jumpers ............................................................................................................................ 45

3.12.3 Wire identification ................................................................................................................................... 45

3.12.3.1 Marking of hook-up and lead wire.................................................................................................... 45

3.12.3.2 Wire markers .................................................................................................................................... 45

3.12.3.3 Standard marking for connections .................................................................................................... 46

3.12.4 Bus bars ................................................................................................................................................... 46

3.12.5 Fiber optic connections ............................................................................................................................ 46

3.12.5.1 Fiber optic cables .............................................................................................................................. 46

3.12.5.2 Fiber optic connectors....................................................................................................................... 46

3.13 Parts ................................................................................................................................................................ 46

3.13.1 Parts selection .......................................................................................................................................... 46

3.13.1.1 Parts derating .................................................................................................................................... 46

3.13.1.1.1 Resistor and rheostat derating .................................................................................................... 46

3.13.1.1.2 Capacitor derating...................................................................................................................... 46

3.13.1.1.3 Discrete semiconductor derating and application stresses ......................................................... 46

3.13.1.1.4 Microcircuit derating ................................................................................................................. 49

3.13.1.2 Standard parts ................................................................................................................................... 49

3.13.1.3 Non-standard parts............................................................................................................................ 49

3.13.1.4 Matched parts selection .................................................................................................................... 49

3.13.1.5 Replacement and interchangeability ................................................................................................. 49

3.13.1.6 Parts tolerances ................................................................................................................................. 50

3.13.2 Fuses and fuseholders .............................................................................................................................. 50