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)

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

3.12.1 Wire.

3.12.1.1 Lead wire. Lead wire is the type of insulated conductor forming an integral part of components such

as motors, transformers, coils, and windings. Lead wire shall be flexible stranded type and, unless otherwise

specified in the equipment specifications, shall be of not less than number 18 American Wire Gauge (AWG). Lead

wire shall be selected in accordance with table XV. When selecting proper lead wire size, the ampacity (see 6.5.1)

should be considered. Wire size shall be determined using National Electric Code NFPA 70 which considers the

temperature the wire will see and number of conductors in the wire bundle.

TABLE XV. Lead wire.

Insulation

Applicable document

Max. temperature, �F (�C)

Crosslinked, modified polyethylene

MIL-DTL-16878, /15, and /16

257 (125)

Crosslinked polyalkene

SAE-AS81044, /8, /9, and /10

302 (150)

Silicone rubber 1/

ANSI/NEMA HP 6

392 (200)

Silicone rubber 1/

ANSI/NEMA HP 6

302 (150)

Ethylene Propylene Diene Monomer

IEEE 1018

400 (204)

(EPDM)

Fluorinated ethylene propylene 2/

ANSI/NEMA HP 4

392 (200)

Polytetrafluoroethylene 2/

ANSI/NEMA HP 3

392 (200)

Crosslinked ethylene-tetrafluoroethylene 3/

SAE-AS22759/47, /48, /49, and /50

392 (200)

NOTES:

See 3.3.1.4 for specific prohibition on application.

Halogen containing lead wire must be approved as specified in 3.3.6.

Preferred due to low halogen content. Use of other halogen containing lead wire must be approved as

specified in 3.3.6.

3.12.1.2 Hook-up wire. Hook-up wire is the type of insulated conductor free at both ends and used for chassis

wiring and interconnecting wiring. Hook-up wire shall be flexible stranded type and shall be selected from

table XVI. When selecting proper hook-up wire size, the ampacity (see 6.5.1) should be considered. Wire size shall

be determined using National Electric Code NFPA 70 which considers the temperature the wire will see and number

of conductors in the wire bundle. The National Electric Code NFPA 70 shall be used for calculations and

adjustments of wire ampacity when multiple conductors are employed in a wire bundle.