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(c) Stuffing tubes mounted on a removable cable entrance plate.
Stuffing tubes will be furnished by the installing activity.
Space shall be provided inside the enclosure so that the ship wiring will not
be crushed or distorted when the internal subassembly is mounted in the
enclosure. Connector or stuffing tubes shall be used where up to four cables
are required and multi-cable transit shall be used where more than four cables
are required.
Gasket:
Gaskets shall be in accordance with the following:
(a) For static seals (between unit case and cover) gaskets, O ring,
in accordance with MIL-P-25732 shall be used. For square or
rectangular enclosures, the inside radius of the O ring at
the corners of the enclosure shall be 1/2 inch minimum.
Gaskets shall be lubricated with a compound in accordance with
MIL-S-8660.
(b) For reciprocating motion seals (pushbutton shafts) and for
rotary motion seals (illumination rheostat shafts or operating
knob shafts where the rotational speed is less than 10 revolu-
tions per minute (r/min)) gaskets, O ring, in accordance with
MIL-P-25732 shall be used. Gaskets shall be lubricated with
a compound in accordance with MIL-S-8660. Clearances and other
installation data as specified in MIL-G-5514 shall be used.
The O ring retaining groove shall be cut in the shaft. Where
lubrication in service is required, it shall be provided as
specified for pneumatic seals in MIL-G5514.
(c) where the use of O rings iS not practicable, gasket materials shall
be in accordance with MIL-R-2765 (oil resistant) or class I
of MIL-R-15624 for other than low temperature (minus 20F minimum)
applications.
(d) For round dial windows, gaskets shall be of a continuous band
of a circumference less than the glass and shall be so arranged
that when stretched over the glass the material will form over
the edge and the faces of the glass to form a "U'* shaped gasket.
Dials and pointers: Dials and pointers (for other than voltmeters) shall
be of plastic materials. The face of the dial with the markings, letterings,
graduations, and pointers shall have a matte finish.
Dial markings and pointers: Dial markings and pointers shall be free from
distortion with clear and sharp edges. Width of the pointer tip shall be the
same width as the dial graduations. Pointer shall not cover the graduations
to which it refers but shall extend only to the nearer edge of the graduation.
Units having self-contained illumination: Dials for units having self-
contained red illumination shall have dark faces with white numerals, gradua-
tions, and lettering when viewed under high level ambient illumination and
shall present red numerals, graduations, and lettering when the internal
illumination is energized and viewed under low level ambient illumination. In
units having a single indication, the pointer shall be black with a white
border. In units having two concentric indications, distinctive numerals and
shapes in addition to a white border shall be used to identify each pointer.
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