MIL-S-49442 (ER)
3.10.7
Connections, soldered, general.
Before being soldered to terminal
lugs or fixed terminals, wires shall be mechanically secured so that the
connections are not dependent for strength on solder alone.
Where practicable,
wires soldered to fixed terminals shall be looped at least one-half turn but not
more than three-quarter turn around the terminal before soldering. Bared ends
of wire leads to be terminated in solder-type terminal lugs shall be tinned,
silver plated, or lead alloy coated.
Electrical connections shall not be made
by clamping between a metallic and non-metallic material.
Fraying of textile
ends of wires shall be prevented mechanically or by the application of varnish
conforming to MIL-V-173. No varnish, lacquer, inspection paint or other coating
shall be applied to completed electrical connections.
3.10.8
Grounding.
Grounding shall be per MIL-STD-1857. Ground connections
to shields and to other mechanical parts, except the chassis frame, shall not
be made to complete electrical circuits but only to eliminate high potential
AC points.
All components within the shelter shall be grounded to the shelter.
A shelter terminal stud with a captive wing nut for grounding the shelter shall
be provided per drawings.
3.10.0
Securing of parts, general.
Brackets, lugs, flanges, inserts, bolts,
and other mounting arrangements shall be such as to retain items securely when
subjected to specified service conditions.
Parts shall be so mounted that loosening,
wear or mounting arrangements, or permanent separation of parts will not occur
when the items in which they are used are subjected to service conditions. Any
permanent deformation resulting from the tests shall not cause degradation of
performance below full specification requirements. When practicable, friction
between mating surfaces shall not be employed as the sole means of preventing
fixed parts from rotating.
Parts shall be secured in such a manner that failure
of a single rivet or screw will not free the part completely.
No self-tapping or
sheet metal screws shall be used.
3.10.10
Riveting.
Riveting shall not be used for mounting parts such as
capacitors.
resistors, transformers, inductors, and tube sockets. Thickness of
countersunk metal which accepts the heads of flush rivets shall not be less than
the height of the rivet heads.
The distance from the center rivet holes to the
edges of the material in which the holes are formed shall be at least 1-1/2 times
the rivet diameter.
Rivets shall be used where practical in preference to other
means of securing aluminum or magnesium structural parts if the joint is subjected
to dynamic tension loads when the equipment is exposed to specified service
conditions and if the parts do not require removal when the equipment is serviced.
After
riveting, the joints shall be tight, the jointed parts shall be undamaged,
and the rivet heads shall be properly seated and tight against their bearing
surfaces.
All joints and raw edges of the framing for the power,
Seal, vapor.
3.10.11
signal entrance boxes, air conditioner, and exhaust blowers shall be sealed to
prevent entrance of moisture to the core material of the shelter panels and to
interior of the shelter. All joints shall be assembled and sealed in a manner to
prevent collection and retention of moisture. All exterior rivets, screws, and
fasteners shall be dipped in sealer prior to installation, the sealer shall be
in accordance with drawing SC-C-681272, Sealant Exterior, and SC-C-681273, Sealant
Interior.
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