MIL-E-2036D

Abstract

This specification covers requirements for enclosures that house electric and electronic equipment for Naval shipboard use. Details concerning construction, ventilation, cooling, and mechanical protection are included in this specification. This specification also covers that class of explosionproof equipment which will contain any spark or ignition within the enclosure and not permit ignition in the surrounding external atmosphere as a result of normal operation or failure of electrical circuits within the enclosure. This specification is not intended to cover enclosures which form an integral part of equipment such as batteries. <br>Enclosures shall be of the following classes and types (degree of enclosure), as specified (see <a>6.2.1</a>): <br>Class 1 - For other than motors, generators, and similar rotating equipment. </span><pre> <u>Types</u>: Airtight Open, protected Dripproof (15 degrees) Splashproof Dripproof (15 degrees) Splashproof, protected protected Dripproof (45 degrees) Submersible (15 foot) Dripproof (45 degrees) Submersible (50 foot) protected Submersible (1600 foot) Dust-ignition proof Open-submersible (15 foot)</pre> <br> <strong>Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Commander, Naval Sea Systems Command, SEA 55Z3, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.</strong> <pre> <u>Types</u>: Dustproof Open-submersible (50 foot) Dusttight Open-submersible (1600 foot) Explosionproof Totally enclosed Hermetic Watertight Open</pre> <br> <br>Class 2 - For motors, generators, and similar rotating equipment. <pre> <u>Types</u>: Airtight Open Dripproof (15 degrees) Open, protected Dripproof (15 degrees) Splashproof protected Splashproof, protected Dripproof (45 degrees) Spraytight Dripproof (45 degrees) Spraytight (fan cooled) protected Submersible (15 foot) Dust-ignition proof Open-submersible (15 foot) Dustproof Open-submersible (50 foot) Dusttight Open-submersible (1600 foot) Explosionproof Totally enclosed Explosionproof (fan-cooled) Totally enclosed (fan-cooled) Submersible (50 foot) Totally enclosed (water-air-cooled) Submersible (1600 foot) Watertight</pre> <br> <br>Equipment designated as fan-cooled shall be as described in MIL-STD-108. Fan-cooled motors, generators, and similar equipment are listed herein because the term fan-cooled is frequently used as part of the enclosure designation. This specification does not contain separate requirements for fan-cooled equipment. The requirements applicable to explosionproof, spraytight, and totally enclosed motors, generators, and similar equipment also apply respectively to explosionproof (fan-cooled), spraytight (fan-cooled), and totally enclosed (fan-cooled) motors, generators and similar equipment. <br>This appendix covers the construction, testing and design approval procedures for explosionproof enclosures for electrical and electronic equipment intended for use in explosive atmospheres normally found on board Naval ships, most of which are listed in group D of the National Electric Code, and among others include: gasoline, hexane, naptha, benzine, butane, alcohol, benzol, lacquer solvent vapors, or natural gas. This appendix is a mandatory part of this specification. The information contained herein is intended for compliance. <br><b><u>Intended Use:</u></b> It is intended that this specification be invoked in individual equipment specifications for enclosures for electrical and electronic enclosures. This specification covers the basic requirements applicable to enclosures intended for Naval shipboard use. Minimum degrees of enclosure that are intended to protect contents of the enclosures in typical environments are listed in <a href="#GPAIDAAAAAAAAAAA-X85">table III</a>. A lesser degree of enclosure may be satisfactory for a particular application if the equipment itself is inherently protected (such as by encapsulation) or does not require complete exclusion of a potentially harmful element in order to perform satisfactorily; however, such determination shall be made, or approved, by the contracting activity responsible for establishing technical requirements. Explosionproof enclosures are required for electric and electronic equipment in hazardous locations (explosive gases or vapors present) regardless of other environmental conditions. Additional protection of explosionproof enclosures, if required, should be obtained by the use of shields or baffles. An exception to the requirement for explosionproof enclosures in hazardous location is the case of "intrinsically safe" installations. An intrinsically safe installation (one in which the energy level is limited to values that preclude ignition of explosive atmospheres) requires the approval of the contracting activity. <a id="GPAIDAAAAAAAAAAA-X85" name="GPAIDAAAAAAAAAAA-X85"><img alt="TABLE III. Enclosures intended use." src="" /></a> NOTES: 1. Enclosure provides protection of personnel against physical contact with electrically energized or moving parts. 2. Normally used for equipment located in machinery spaces aboard ship, except where more severe conditions prevail. 3. Common enclosure for pump motor applications aboard ship, except where submergence or explosionproofness is required. Motor specifications require a shaft slinger for pump applications. 4. Fan-cooled rotating equipment not suitable in weather exposed locations because icing conditions could cause failure or malfunction. 5. Suitable for equipment on ship's decks which may be awash in heavy seas. 6. Select submergence depth (15, 50 or 1600 foot) as applicable. <br>