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 \(see 6.2\).

Pages 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18

MIL-DTL-917F(SH)

PARAGRAPH

PAGE

3.3.3.1 Dials and other transparent and translucent applications .................................................................... 31

3.3.4 Glass .......................................................................................................................................................... 31

3.3.5 Recycled, recovered, environmentally preferable, or biobased materials.................................................. 31

3.3.6 Non-preferred component materials .......................................................................................................... 31

3.4 Electrical insulation .......................................................................................................................................... 31

3.4.1 Insulation materials.................................................................................................................................... 31

3.4.1.1 Arc and tracking resistance ................................................................................................................. 31

3.4.1.2 Laminated plastics .............................................................................................................................. 31

3.4.1.2.1 Machined edges ........................................................................................................................... 31

3.4.1.2.2 Color of laminates........................................................................................................................ 32

3.4.1.3 Molded plastics ................................................................................................................................... 32

3.4.1.3.1 Molded thermosetting plastics ..................................................................................................... 32

3.4.1.3.1.1 Colors of thermosetting plastics ........................................................................................... 32

3.4.1.3.2 Thermoplastics............................................................................................................................. 32

3.4.1.4 Ceramics ............................................................................................................................................. 33

3.4.1.5 Silicone ............................................................................................................................................... 33

3.4.2 Insulating material ..................................................................................................................................... 33

3.4.2.1 Classes and definitions of insulating materials ................................................................................... 33

3.4.2.2 Accepted tests ..................................................................................................................................... 33

3.4.3 Insulation systems...................................................................................................................................... 33

3.4.3.1 Temperature classification of insulation systems ............................................................................... 33

3.4.3.2 Alternative temperature specification of insulation systems .............................................................. 34

3.4.3.3 Insulation class system ....................................................................................................................... 34

3.4.3.4 Insulation class suitability................................................................................................................... 34

3.4.4 Thermal endurance evaluation................................................................................................................... 34

3.4.5 Ground insulation ...................................................................................................................................... 34

3.4.6 Core tubes and bobbins.............................................................................................................................. 35

3.4.7 Toroid core boxes ...................................................................................................................................... 35

3.4.8 Layer and phase insulation ........................................................................................................................ 35

3.4.9 Spacers....................................................................................................................................................... 35

3.4.10 Binding tape and strips ............................................................................................................................ 36

3.4.11 Electrical tape .......................................................................................................................................... 36

3.4.12 Slot-wedges (non-metallic)...................................................................................................................... 36

3.4.13 Insulating panels ...................................................................................................................................... 37

3.4.14 Sleeving ................................................................................................................................................... 37

3.4.15 Commutator insulation ............................................................................................................................ 37

3.4.16 Band insulation ........................................................................................................................................ 37

3.4.17 Lacing and tying cords for varnished coils and windings ........................................................................ 37

3.4.18 Armature and coil banding using glass .................................................................................................... 37

3.5 Dielectric barrier............................................................................................................................................... 37

3.6 Coils and windings ........................................................................................................................................... 37

3.7 Treating methods .............................................................................................................................................. 38

3.7.1 Built-up ...................................................................................................................................................... 38

3.7.2 Brushing or flowing ................................................................................................................................... 38

3.7.3 Vacuum-pressure impregnation (VPI) ....................................................................................................... 38

3.7.4 Dipping ...................................................................................................................................................... 38

3.7.5 Brushing or spraying.................................................................................................................................. 38

3.8 Treating materials ............................................................................................................................................. 38

3.8.1 Varnish ...................................................................................................................................................... 38

3.8.2 Encapsulants and compounds used on coils and windings ........................................................................ 39