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)

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3.19 Requirements for operating voltages greater than 1,000 V, but less than or equal to 15,000 V ..................... 66

3.19.1 Medium and high voltage power requirements........................................................................................ 66

3.19.1.1 Medium voltage DC power systems ................................................................................................. 66

3.19.1.2 High voltage input power ................................................................................................................. 66

3.19.2 Wire ......................................................................................................................................................... 66

3.19.2.1 1,000 to 5,000-V hook-up wire......................................................................................................... 66

3.19.2.2 5,000 to 15,000-V hook-up wire....................................................................................................... 66

3.19.2.3 Wire methods.................................................................................................................................... 66

3.19.2.3.1 Wire practices ............................................................................................................................ 66

3.19.2.3.2 Wire connections and terminals ................................................................................................. 66

3.19.2.3.3 Bus bars ..................................................................................................................................... 66

3.19.2.3.4 Connection marking................................................................................................................... 66

3.19.3 Fuses, expulsion and current limiting fuses, and fuse disconnecting switches ........................................ 67

3.19.3.1 Fuses and fuse disconnecting switches design.................................................................................. 67

3.19.3.2 Expulsion and current limiting fuses and fuse disconnecting switches design ................................. 67

3.19.3.3 Fuses, expulsion and current limiting fuses, and fuse disconnecting switches application,

operation, coordination, and maintenance ....................................................................................................... 67

3.19.4 Circuit breakers........................................................................................................................................ 67

3.19.4.1 Circuit breakers................................................................................................................................. 67

3.19.4.2 Generator circuit breakers................................................................................................................. 67

3.19.5 Switches................................................................................................................................................... 67

3.19.6 Relays ...................................................................................................................................................... 67

3.19.7 Insulators ................................................................................................................................................. 67

3.19.8 Current transformers ................................................................................................................................ 67

3.19.9 Maintenance safety .................................................................................................................................. 67

3.19.9.1 Partial discharge detection maintenance equipment ......................................................................... 67

3.19.9.2 Capacitive voltage indicating systems .............................................................................................. 67

3.20 Information assurance (IA) ............................................................................................................................. 68

4. VERIFICATION .................................................................................................................................................... 68

4.1 General ............................................................................................................................................................. 68

4.2 Classification of inspections ............................................................................................................................. 68

4.3 Manufacturing screening tests .......................................................................................................................... 68

4.3.1 Level of testing .......................................................................................................................................... 68

4.3.2 Environmental stress screening test procedures and sequence .................................................................. 68

4.3.2.1 Circuit card vibration testing .............................................................................................................. 68

4.3.2.2 Vibration and thermal cycling of assemblies and subassemblies ....................................................... 68

4.3.2.3 Vibration axis ..................................................................................................................................... 68

4.3.2.4 Equipment energization ...................................................................................................................... 69

4.3.3 100-hour burn-in test ................................................................................................................................. 69

4.4 Conformance inspection ................................................................................................................................... 69

4.4.1 Dielectric withstanding voltage tests ......................................................................................................... 71

4.4.2 Insulation resistance tests .......................................................................................................................... 72

4.4.2.1 Electrically isolated circuits ................................................................................................................ 72

4.4.2.2 Moisture resistance ............................................................................................................................. 72

4.4.2.3 Arc and tracking resistance ................................................................................................................. 72

4.4.3 Leakage current test ................................................................................................................................... 72

4.4.4 Reliability and maintainability assurance .................................................................................................. 72

4.4.4.1 Reliability demonstration tests............................................................................................................ 72

4.4.4.2 Maintainability demonstration tests .................................................................................................... 72

4.4.5 Insulation suitability test ............................................................................................................................ 73