MIL-DTL-917F(SH)
3.13.11 Motors. Motors shall be in accordance with MIL-M-17059 or MIL-DTL-17060, and as specified in
the equipment specification. Refer to MIL-M-17413 and MIL-M-17556 for guidance. Terminal markings and
rotation shall be in accordance with MIL-STD-681.
3.13.12 Servo-motors. Servo-motors shall be in accordance with MIL-S-22432.
3.13.13 Synchros. Synchros shall be in accordance with SAE-AS20708. Guidance for installation
requirements can be found in MIL-HDBK-225. The secondary load impedance for the synchro control transformers
shall be specified in the equipment service manual in the descriptive data for the synchro heading receiver. This
load impedance shall be not less than 30,000 ohms.
3.13.14 Relays. Relays shall be in accordance with MIL-R-19523 except as stated hereinafter. Where the
relay is expected to be operated infrequently, especially at low current levels, and immediate acceptable operation of
the circuit is required, gold plated contacts shall be used.
a.
Overload and time delay relays shall be in accordance with MIL-DTL-2212 for AC and DC applications.
b. Relays that require extremely high insulation resistance, a minimum of contact resistance, and special coil
sensitivity, or any of these, so that they cannot be supplied under MIL-R-19523, refer to Category 1, enclosure
design symbol 4, of MIL-R-5757. Their selection shall be in accordance with the general requirements of
MIL-PRF-6106 and MIL-PRF-28750. Refer to MIL-R-5757 for additional guidance.
c.
Rotary relays shall operate in a 194 °F (90 °C) ambient temperature.
d.
Solid state relays shall be in accordance with MIL-PRF-28750.
e.
Power monitoring and control relays shall be in accordance with MIL-M-24350.
f.
Protective relays used with circuit breakers shall be Navy-approved relays (see 6.2).
3.13.15 Terminal boards. Terminal boards shall be in accordance with A-A-59125, except that lock washers
are not required under terminal nuts and screws. Terminal boards of the stud type shall be double row, linked, front
connected Classes 8TB, 10TB, 17TB, and 26TB, double screw, front connected Classes 37TB, 38TB, and 39TB, or
single row through connected Classes 3TB, 5TB, 7TB, 11TB, and 27TB. No more than three wires shall terminate
at any one stud or terminal; except where Classes 8TB and 26TB with stud connector are used, only two wires may
terminate at any one stud.
3.13.16 Terminal lugs. Terminal lugs shall be in accordance with SAE-AS7928. Class 1 ring tongue terminals
and rectangular tongue lug terminals are the preferred types. Ring tongue design in accordance with
SAE-AS7928/1 is preferred. Rectangular tongue terminal lugs in accordance with SAE-AS7928/2 are also
acceptable, depending on the type and size of cable or hook-up wire being used and the current level.
3.13.16.1 Insulated types. Insulated types shall conform to Type II, Class 1. Insulated types are not to be used
when the conductor temperature exceeds 212 °F (100 °C).
3.13.16.2 Uninsulated types. Uninsulated types shall conform to Type I, Class 1. When required, additional
sizes of uninsulated lugs are covered by MIL-T-16366.
3.13.16.3 Lower current applications. On all applications of 5 amperes or less, the terminal lugs shall conform
to Type II, Class 1. The terminal lugs shall be selected from the appropriate military standard drawing so that the
inside diameter of the terminal lug barrel in which the bare wire is to be inserted is smaller than the outside diameter
of the insulation on the wire.
3.13.16.4 Higher current applications. On all applications greater than 5 amperes, but within the current limits
of SAE-AS7928, the terminal lugs shall conform to Type I, Class 1 or Type II, Class 1 depending on the
temperature of the conductor. When the temperature exceeds 212 °F (100 °C), an uninsulated terminal lug Type I,
Class 1 that falls within the current limits of SAE-AS7928 shall be selected from the appropriate military standard
drawing and used with the addition of an insulating sleeve suitable for the maximum temperature of the conductor.
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