MIL-DTL-2036E
APPENDIX A
A.3.3.4 Location of fasteners. Fasteners in the required width of the joint shall be so located as to
conform to the requirements of (a) through (e). Figures A-6 and A-7 illustrate typical fastener locations.
(a)
The distance between fasteners for plane joints shall not exceed 6 inches (152mm), measured
along the shortest path within the joint gap. Greater spacings may be used for stepped joints
upon approval of the contracting activity.
(b)
The shortest distance from the inside of the enclosure to the edge of the fastener clearance hole
(c)
If the bolt hole is to be considered part of the flame path (joint) the diametrical clearance between
the fastener and fastener clearance hole shall be as shown on figure A-7.
(d)
A minimum thickness of metal between bottom of tapped hole in joint width and inside of
enclosure shall be 0.125 inch or 1/3 of the hole diameter, whichever is greater
enclosure and are secured in place by peening, staking, tack welding, or equivalent means.
(e)
Interpoles fastened to the motor frame by bolts (or studs) may have a distance from edge of pole
piece to the bolt hole in the motor as shown on figure A-7.
A.3.4 Press-fitted parts. A metal pin or part press-fitted through the enclosure shall engage for a
distance of at least .375 inch (9.53mm) and be adequately secured against removal by riveting, peening,
tack welding, or equivalent.
A.3.5 External fans. External fans on explosionproof fan-cooled motors shall be of nonsparking material
such as brass, or aluminum, or plastic (when specifically approved by the contracting activity) and shall
be securely mounted. Substantial fan guards or shields shall be provided.
A.3.6 Provision for connection to electrical power source.
A.3.6.1 Rotating equipment.
A.3.6.1.1 Permanently mounted (nonportable) equipment. A terminal box shall be provided. The
terminal box, cover, and attachment to equipment enclosure shall be of explosionproof construction in
accordance with this appendix, except that plane joints .75 inch (19.05mm) in width with a joint clearance
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of 0.002 inch may be used for the cover of terminal boxes with an internal free volume of 45 in (737cc) or
less.
A.3.6.1.1.1 Passage between motor (or similar machine) and terminal box. Leads or conductors shall be
securely held where they pass into the motor. The passage between the motor and terminal box shall be
filled by one of the means listed below. Typical construction is shown on figure A-8.
(a)
If a tube or blocked passage is provided. The length of the blocked passage and the clearance
around the leads shall be satisfactory to the contracting activity. There shall be no sharp edges
where the leads pass through the clearance openings. Detail drawings shall show the minimum
permissible length of tube with the maximum permissible clearance around leads.
(b)
Sealing compound. The design of the opening and characteristics of the sealing compound shall
be such as to hold the sealing compound securely in place. The compound shall be compatible
with the leads passing through it and shall not soften or crack under normal service conditions.
The sealing compound shall have a minimum depth of .625 inch (15.88) with increase as a
function of the internal length of joint in inches. When reinforced by metal the seal depth may be
reduced by .25 inch (6.35mm) provided that a .625 inch (15.88) minimum depth remains. The
sealing compound shall not loosen or crack during explosion tests.
A.3.6.1.2 Portable equipment. Electrical power cable (or cord) assemblies and electrical assemblies for
electronic equipment shall be as required by the equipment specification. The cable shall enter the
equipment through a properly packed Navy standard terminal tube. Packing (conforming to MIL-P-16685
or equivalent) shall be used and the length of packing along the cable when compressed by the gland nut
shall be at least .625 inch (15.88). The terminal tube shall be long enough to provide for this feature.
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