MIL-DTL-22438C
3.4 Design and construction. Receptacle panels shall conform to the design, construction, and
physical dimensions specified on the specification sheets.
3.4.1 Hardware. Screws, nuts, washers, and miscellaneous hardware shall be of a good commercial
grade material compatible with that of the basic panel, and protected against corrosion. Self-tapping
screws or other self-tapping devices shall not be used.
3.4.1.1 Locking devices. Locking devices shall be used, where required, to secure components to
insure continuous satisfactory operation under test conditions specified.
3.4.2 Threads. Threads shall be right hand, class 2, complying with Unified and American National
screw threads as specified in FED-STD-H28.
3.4.2.1 Engagement of threaded parts. Thread engagement shall be a minimum of 2/3 of the diameter
of the bolt or screw.
3.4.3 Drilling, countersinking, or tapping. All drilling, countersinking, and tapping shall be done before
plating or finish is applied, except when necessary to insure conformance with 3.4.5.4.
3.4.4 Sharp edges. All sharp edges that are accessible shall be given a slight radius.
3.4.5 Receptacle and plug assemblies.
3.4.5.1 Receptacles, direct current (dc) and 400 hertz (Hz) alternating current (ac). Receptacles
furnished for dc and 400Hz power outlets shall be in accordance with SAE AS50151 or MIL-DTL-2726, as
applicable. The type receptacle designated by part number or specification sheet number, and the
quantity to be furnished shall be as specified on the applicable specification sheet.
3.4.5.2 Receptacles, 60Hz ac. Receptacles for 60HZ power outlets shall be duplex receptacle
applicable specification sheet.
3.4.5.3 Plug assemblies, dc and 400Hz ac. Plug assemblies for use with dc and 400HZ outlets shall
be furnished only when specified on the individual specification sheet. The plugs, when specified, shall
applicable specification sheet.
3.4.5.4 Ground continuity. Any receptacle with a ground contact electrically connected to the
receptacle shell or mounting strap shall maintain this electrical continuity with the panel through the
mounting screws (an additional connection to a ground post may be required by the specification sheet).
3.4.6 Terminal boards. Terminal post assemblies (see 3.4.6.1) shall be securely fastened to or molded
integrally with the terminal board base by a method that will prevent any loosening or change in position
under the test conditions of 4.7.5 and 4.7.6. Any live part of the terminal board exposed on the underside
of the base (such as screws, rivets, and so forth used for attaching terminal post assemblies to the base)
shall be recessed in a counterbored hole, and covered with a good quality insulating resin. The sealing of
the counterbored holes with resin is not required when the fasteners involved are prevented from
loosening under vibration shock, and an insulating subbase is employed, or the creepage and clearance
distances specified in MIL-E-917 are adequate without the use of a subbase. To facilitate interpanel bus
connections, the orientation of bus connection terminal posts shall be as shown on the applicable
specification sheet. Phase and frequency, or polarity markings, as shown on the specification sheet, shall
be molded or engraved on the terminal boards. The height of the terminal boards, after installation of the
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