MIL-DTL-24552B(SH)
3.5.10 Phase identification. Phase identification (A, B, and C) shall
be permanently and legibly marked on the plug and terminal housings in
characters at least 0.12 inch high. Phase orientation shall be A, B, and C,
respectively, front to rear and right to left (as viewed from front) as
specified (see 3.1).
3.5.11 Electrical creepage and clearance distances. Clearance distance
in air between energized parts or between an energized part and ground shall
be not less than 0.500 inch. Creepage distance between energized parts or
between an energized part and ground shall be not less than 0.875 inch.
3.5.12 Bus bar. Terminal and switch bus bars shall be copper, hard
temper in accordance with ASTM B 187. The bus shall be solid2 and shall have a
cross sectional area of not less than 0.0625 square inch (in ).
3.5.12.1 Plating. Bus bars shall be silver-plated in areas of current-
carrying contact with bus ties, contacts, and terminals. The plating shall be
in accordance with QQ-S-365, with the exception that the silver plate shall be
not less than 0.0002 inch thick. Silvering a 0.125-inch wide band on the
surface area surrounding each hole used for retaining an electrical-carrying
contact will be acceptable; however, the entire bus may be silver-surfaced at
the discretion of the manufacturer. Threaded surfaces used as electrical
contact surfaces shall have silver thickness of at least 0.0002 inch.
3.6
Performance characteristics.
3.6.1 Dielectric withstanding voltage. There shall be no arcing,
breakdown, corona (audible or visible), or punctured insulation when plugs and
terminals or switches are tested as specified in 4.7.1.
3.6.2 Insulation resistance. With plugs and terminals or switches
unmated, the insulation resistance between electrical conductors and between
electrical conductors and ground shall be not less than the values indicated,
when tested as specified in 4.7.2:
a. 500 megohms - Terminals and plugs.
b. 1 megohm - Switches.
3.6.3 Contact engaging and separating forces. The required engaging
force shall be not greater than 100 ounces, and the separation force shall be
not less than 10 ounces when individual contacts are tested as specified in
4.7.3.
3.6.4 Plug engaging and separating forces. The required force for
engaging or separating a plug from a receptacle (see 3.5.4) shall be not
greater than 20 pounds when tested as specified in 4.7.4.
3.6.5 Cable pull-out. Cables shall not pull out of their respective
plugs when a 360-pound load is applied as specified in 4.7.5.
3.6.6 Ambient temperature extremes. When tested as specified in 4.7.6,
plugs and terminals shall withstand ambient temperature extremes of minus 20
O
O
degrees Celsius ( C) to plus 125 C without showing evidence of mechanical
damage as follows:
a. Cracking or delamination of finish.
b. Mechanical displacement or rupture of conductors or insulating
materials.
Following the test, terminals and plugs shall pass tests specified in 4.7.1
and 4.7.2, respectively. Bulkhead terminals shall also pass the test specified
in 4.7.16.
3.6.7
Contact resistance.
Terminals which have not undergone the salt
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