MIL-DTL-2036E
3. REQUIREMENTS
3.1 First article. When specified (see 6.2.3), samples shall be subjected to first article inspection in
accordance with 4.3.
3.2 General. Enclosures shall be in accordance with this specification and the requirements of
MIL-STD-108.
3.2.1 Basic requirements (see 4.5). The requirements of MIL-E-917 shall apply for the following:
(a)
Equipment mounting (HI-shock).
(b)
Materials.
(c)
Threaded parts and fastening devices.
(d)
Treatment and processing of metals for corrosion resistance.
Painting (see 6.3).
(e)
(f)
Welding.
3.2.2 Nonmagnetic enclosures (see 4.6.1). When equipment is specified or required to be nonmagnetic,
the material used shall have a permeability of not greater than 2.0. Enclosures for nonmagnetic ships
and craft shall be in accordance with DOD-STD-2143.
3.2.3 Eddy current magnetism (see 4.6.1). Eddy current magnetism requirements apply to nonmagnetic
ships and craft only and shall be in accordance with DOD-STD-2143 (see 6.3).
TABLE I. Face areas.
Column 1, 1/
Column 2, 3/
Column 3, 4/
Column 4, 2/, 4/, 5/
Conductivity relative
Thickness of
Cross sectional
Maximum allowable
2
to copper
material inches
area in
face area for face
2
of enclosure ft
Greater than 10 percent
0.25 to 2
10 to 48
5
2
2
(6.35 to 50.8 mm)
(64.5 to 309.7cm )
(.465 m )
Greater than 10 percent
Less than 0.25
Less than 10
12
2
2
(6.35 mm)
(64.5cm )
(1.115 m )
0.29 to 10 percent
Less than 0.25
Less than 24
30
2
2
(154.8cm )
(2.787 m )
(6.35 mm)
Less than 10 percent
0.25 to 1
24 to 28
20
2
2
(6.35 to 25.4 mm)
(154.8 to 180.6cm )
(1.858 m )
Less than 0.5 percent
Any
Less than 24
No restrictions
2
(154.8cm )
1/
Percentage of conductivity (column 1) refers to the electrical conductivity of the material relative to
copper which is rated at 100 percent. Common materials having conductivity greater than 10 percent
of that of copper include aluminum, brass, and bronze. Those having less than 10 percent include
steel (all types) and nickel-copper-aluminum.
2/
(Column 4). The face of the enclosure is that side which has the largest electrically continuous
conducting area.
3/
From the thickness of the material (column 2), determine the maximum allowable area for the face of
the enclosure (column 4).
4/
Obtain the cross sectional area of the material (column 3) by taking the product of the thickness of the
material and the dimension of the side perpendicular to the face of the enclosure. From the cross-
section of the material determine the maximum allowable area for the face of the enclosure (column 4).
5/
Compliance with the less restrictive of the parameters, thickness or cross-section, is satisfactory for
determining the maximum allowable face area of the enclosure.
4
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