MIL-DTL-23928G
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance with the
applicable specification sheet. In the event of any conflict between the requirements of this specification and the
specification sheet, the latter shall govern.
3.1.1 Special panels. Where panels covered by the specification sheets do not meet the needs of a given
application, the requirements of this specification shall apply; the specific details, however, are covered by the
contractor's drawing and the contract of order (see 6.2). In the event of any conflict between requirements of this
specification, the contract drawing, or the ordering data, the order of precedence shall be:
a.
Ordering data.
b.
This specification.
c.
Contractor's drawing.
3.2 First article. When specified, a sample shall be subjected to first article inspection (see 6.4) in accordance with
4.2.
3.3 Parts and materials. Parts and materials shall be as specified herein. When not specified, they shall be
selected in accordance with MIL-E-917, or shall be reviewed by the contracting activity in accordance with MIL-E-917
(see 3.3.15).
3.3.1 Metals. Metals shall be of a corrosion-resistant type or shall be treated to resist corrosion in accordance with
MIL-E-917. Dissimilar metals in contact with each other, shall be selected in accordance with MIL-E-917.
3.3.2 Nonmetallic materials. Nonmetallic materials shall be nonflammable, nontoxic, and fungus-inert in
accordance with MIL-E-917.
3.3.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
3.3.4 Insulation.
3.3.4.1 Insulating material. Insulating material for bus supports, spacers, and other fabricated parts shall be type
GME in accordance with MIL-I-24768/1 or type GPO-N3 in accordance with MIL-I-24768 and MIL-I-24768/6. Molded
parts shall be made from molding compounds in accordance with ASTM D5948 and MIL-E-917. Insulating material
used to obtain electrical clearance shall be not less than .125 inch (3.18 mm) thick when there is a possibility of
impact or abrasion to the insulating material resulting from H.I. shock or vibration; otherwise a thickness of .0625 inch
(1.59 mm) is allowable. The insulating material shall be secured by through bolting.
3.3.4.2 Insulation distances. Insulation distances in air and surface creepage distances on insulating materials for
all live parts shall be in accordance with MIL-E-917. Panels having clearance distances for rigid construction that will
break before measurable distortion can occur, shall be in accordance with MIL-E-917.
3.3.4.3 Distortion distance. All parts subject to distortion or movement during shock or vibration shall conform to
the minimum distances shown in table I.
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