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MIL-DTL-2212 Contactors And Controllers, Electric Motor Ac Or Dc, And Associated Switching DevicesThis specification covers alternating current \(AC\) and direct current \(DC\) motor controllers, contactors \(see 6.8.6\), and associated switching devices \(see 6.8.3\). Included are magnetic controllers, controller parts \(see 6.8.52\), limit switches \(see 6.8.90\), pressure switches \(see 6.8.92\), temperature switches \(see 6.8.95\), selector switches \(see 6.8.94\), push-buttons \(see 6.8.57\), and similar devices used for control of electric motors \(see 6.8.19\). Semiconductor \(solid-state\) devices used as parts for magnetic controllers are included.

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MIL-DTL-2212K(SH)
3.16.16.2 Special provisions for enclosures. If the degree of enclosure is not specified, dripproof (45 degrees)
enclosures shall be used for controllers, and watertight enclosures shall be used for associated switching devices.
Watertight and submersible enclosures larger than 60 in3 shall have a moisture drain in the bottom. The opening
shall be closed with a ¼-inch National Pipe Thread (NPT) pipe plug. Enclosures shall be constructed so that all
necessary cables can be brought into either the top or bottom. Enclosures larger than 4 ft3 shall have removable
cable entrance plates. Each enclosure shall be constructed to support itself and its parts when deck or bulkhead
mounted. Fans shall not be used. Enclosures shall be constructed to allow cable entrance by one of the following
methods:
a.
Stuffing tube in accordance with ASTM F1836M.
b.
Female NPT.
3.16.16.3 Large enclosures. Enclosures larger than 1.5 ft3, except explosion-proof enclosures, shall have
hinged doors. Doors wider than 18 inches shall be removable, and the removal shall require not more than 18 inches
of free space in front of the enclosure. Doors on dripproof enclosures shall be secured by captive thumb screws or
other fasteners with all parts captive. Doors on watertight and submersible enclosures shall be secured by captive
screws.
3.16.16.4 Small enclosures. Enclosures 1.5 ft3 and smaller may have hingeless removable covers provided that
no electrical devices are mounted on the cover.
3.16.16.5 Plastic enclosures. Plastic enclosures shall have any penetration of the enclosure completely
insulated from possible electrical contact with internal conductors.
3.16.16.6 Aluminum enclosures. Aluminum enclosures shall have any penetration of the enclosure completely
insulated from possible electrical contact with internal conductors.
3.16.16.7 Basic dimensional limits. Basic dimensional limits of the enclosures shall be in accordance with
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