1、10 March 1988 SUPERSEDING MIL-E-2036C(NAW) 30 September 1958 (See 6.8) MILITARY SPECIFICATION ENCLOSURES FOR ELECTRIC AND ELECTRONIC EQUIPMENT This specification is approved for use within the Naval Sea Systems Command, Department of the Navy, and is available for use by all Departments and Agencies
2、 of the Department of Defense. 1. SCOPE 1.1 Scope. 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 spe
3、cification 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 enclo- sure. This specification is n
4、ot intended to cover enclosures which form an integral part of equipment such as batteries. 1.2 Classification. Enclosures shall be of the following classes and types (degree of enclosure), as specified (see 6.2.1): Class 1 - For other than motors, generators, and similar rotating equipment. Types :
5、 Airtight Open, protected Dripproof (15 degrees) Splashproof Dripproof (15 degrees) Splashproof, protected Dripproof (45 degrees) Submersible (15 foot) Dripproof (45 degrees) Submersible (50 foot) Dust-ignition proof Open-submersible (15 foot) protected protected Submersible (1600 foot) Beneficial c
6、omments (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 5523, Department of the Navy, Washington, DC 20362-5101 by using the self-addressed Standardization Document Improve
7、ment Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC N/A FSC 5935 DISTRIBUTION STATEMENT A Approved for public release; distribution unlimited Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-203bD 59 W 999990b 0
8、007805 5 m lIIL-E-203bD(SH) Types : Dustproof Dusttight Explosionproof Hermetic open Open-submersible (50 foot) Open-submersible (1600 foot) Totally enclosed Watertight Class 2 - For motors, generators, and similar rotating equipment. Airtight Dripproof (15 degrees) Dripproof (15 degrees) Dripproof
9、(45 degrees) Dripproof (45 degrees) Dust-ignition proof Dustproof Dust t ight Explosionproof Explosionproof (fan-cooled) Submersible (50 foot) Submersible (1600 foot) protected protected wen Open, protected Splashproof Splashproof, protected Spraytight Spraytight (fan cooled) Submersible (15 foot) O
10、pen-submersible (15 foot) Open-submersible (50 foot) Open-submersible (1600 foot) Totally enclosed Totally enclosed (fan-cooled) Totally enclosed (water-air-cooled) Watertight 1.2.1 Equipment designated as fan-cooled shall be as described in MIL-STD-108. Fan-cooled motors, generators, and similar eq
11、uipment 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
12、similar equipment also apply respectively to explosionproof (fan-cooled), spraytight (fan-cooled), and totally enclosed (fan-cooled) motors, generators and similar equipment. 2. APPLICABLE DOCUMENTS 2.1 Government documents. 2.1.1 Specifications and standards. The following specifications and standa
13、rds form a part of this specification to the extent specified herein. Unless otherwise specified, the issues of these documents shall be those listed in the issue of the Department of Defense Index of Specifications and Standards (DoDISS) and supplement thereto, cited in the solicitation. 2 Provided
14、 by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-HIL-E-Z056D(SH) 3 SPECIFICATIONS FEDERAL L-P-504 L-P-535 W-F-406 MILITARY MIL-1-63 MIL-R-900 MIL-S-901 MIL-E-9 17 MIL-P-7788 MIL-P-15024 - Plastic Sheet and Film, Cellulose Acetate. - Plastic Sheet (Sheeting):
15、Plastic Strip: Poly (Vinyl Chloride) and Poly (Vinyl Chloride-Vinyl Acetate), Rigid. Conduit, Metal, Flexible. - Fittings for Cable, Power, Electrical and - Insulation, Electrical, Synthetic-Resin - Rubber Gasket Material, 45 Durometer Hardness. - Shock Tests, H.I. (High-Impact): Shipboard - Electri
16、c Power Equipment, Basic Requirements - Panels, Information, Integrally Illuminated. - Plates, Tags and Bands for Identification of Composition, Nonrigid. Machinery, Equipment and Systems, Requirement for. (Naval Shipboard Use). Equipment. MIL-P-15024/5 - Plates, Identification. MIL-S-16032 - Switch
17、es and Detectors, Shipboard Alarm Systems. ML-C-19836 - Coolers, Fluid, Industrial, Air Motor and Generator, Naval Shipboard. STANDARDS FEDERAL FED-STD-H28/2 - Screw-Thread Standards for Federal Services, Section 2, Unified Inch Screw Threads - UN and UNR Thread Forms. MILITARY MIL-STD-108 - Definit
18、ions of and Basic Requirements for Enclosures for Electric and Electronic Equipment. Equipment. MIL-STD-454 - Standard General Requirements for Electronic MIL-STD-810 - Environmental Test Methods and Engineering Guidelines. MIL-STD-1310 - Shipboard Bonding, Grounding, and Other Techniques MIL-STU-16
19、80 - Installation Criteria for Shipboard Secure DOD-STD-2143 - Magnetic Silencing Requirements for the Construc- for Electromagnetic Compatibility and Safety. Electrical Information Processing Systems. tion of Nonmagnetic Ships and Craft. (Me.tric) (Copies of specifications and standards required by
20、 contractors in connection with specific acquisition functions should be obtained from the contracting activity or as directed by the contracting activity.) Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-2.2 Order of precedence. In the event of a co
21、nflict between the text of this specification and the references cited herein (except for associated detail specifications, specification sheets or Pis standards), the text of this specifi- cation shall take precedence. Nothing in this specification, however, shall supersede applicabie laws and regu
22、lations unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 General. Enclosures shall be in accordance with this specification and the requirements of PIIL-STD-108. 3.1.1 Basic requirements. The requirements of PIIL-E-917 shall apply for the following: (a) Equipment mounting (HI-shock
23、). (b) Materials. (c) Threaded parts and fastening devices. (d) Treatment and processing of metals for corrosion resistance. (e) Painting (see 6.3). (f) Welding. 3.1.2 Nonmagnetic enclosures. When equipment is specified or required to be nonmagnetic, the material used shall have a permeability of no
24、t greater than 2.0. Enclosures for nonmagnetic ships and craft shall be in accordance with DOD-STD-2143. 3.1.3 Eddy current magnetism. 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. Conductivi
25、ty relative to copper I Thickness sectional of material area (inches) ( in2) Greater than 0.25 to 2 10 to 48 10 percent Greater than Less than Less than $0 percent O. 25 IO 0.29 to 10 Less than Less than percent 0.25 24 See footnotes at end of table. “ -=7 4 r (4 1 Maximum allowable face area for fa
26、ce of enclosure (ft2) 5 12 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE I. Face areas. - (Continued) (1) (4 1 (3) (2) Max imum Cross allowable face Conductivity Ut) ( in ) ( inches ) copper L of enclosure area4 of material relative to area f
27、or face sectional Thickness Less than 20 24 to 28 0.2s to 1 10 percent. Less than No restrictions Less than hY 0.5 percent 24 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 conducti
28、vity 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. electrically continuous conducting area. allowable area for the face of the enclosure (column 4). product of the thickness of th
29、e material and the dimension of the side perpen- dicular 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). section, is satisfactory for determining the maximum allowable face area of the enclosure. (Col
30、umn 4). The face of the enclosure is that side which has the largest From the thickness of the material (column 2), determine the maximum L Obtain the cross sectional area of the material (column 3) by taking the Compliance with the less restrictive of the parameters, thickness or cross- 3.1.4 Casti
31、ngs. Cast enclosures shall be in accordance with requirement 21 of MIL-STD-454. 3.1.5 Lifting provisions, Enclosures that will weigh more than 75 pounds when equipment is installed within the enclosure shall have lifting eyes integral with the enclosure, or shall be equipped with eyebolts or other l
32、ifting provi- sions, to facilitate lifting and handling of the equipment. Where provisions such as eyebolts are used, their removal shall not leave openings into the interior of the enclosure. 3.1.6 Projections edges and corners. Projections and overhanging edges which may cause personal injury or c
33、atch upon clothing shall be avoided. Edges and corners of external surfaces shall be rounded to a minimum radius of 0.04 inch, and exposed corners to a minimum of 1/2 inch. 3.1.7 Mounting details. The mounting requirements in accordance with MIL-E-917 and as specified in 3.1.7.1 through 3.1.7.3 shal
34、l apply to all enclosures except those forming a part of portable equipment. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.1.7.1 Enclosed assemblies, subassemblies, and parts. The enclosure shall provide structural support of assemblies, subass
35、emblies, and parts mounted within the enclosure. Mounting bolts for the enclosed assemblies, subassemblies, and parts shall not penetrate the enclosure. Mounting of assemblies, subassem- blies, and parts shall be independent of enclosure mounting. 3.1.7.2 Enclosure mounting. The enclosure mounting b
36、olts shall be accessible after the equipment is installed inside. It shall not be necessary to remove assemblies, subassemblies, and parts before removing the enclosure from bulkhead or deck. Enclosure weight shall be transmitted to the ships structure and not be borne by the walls of the enclosure.
37、 Sway bracing shall be provided for any unit which is susceptible to deflections of 1/2 inch or more due to vibration or shock. 3.1.7.3 Spot facing. In the case of equipment intended for permanent installation and having mounting feet of cast, uneven or rounded material, the material around the moun
38、ting bolt holes shall be spot faced to accommodate washers and mounting bolts. 3.1.8 Access. Enclosures shall provide for convenient access to terminals and all working parts for the purpose of installation, repair, and adjustment. 3.1.8.1 Access to nonrotating equipment. Access to wiring on the bac
39、k of a panel shall be made possible by providing a means of removal of the panel through access covers or doors on the front of the enclosure. Access for replace- ment of parts shall be possible from the front of the enclosure without disassem- bly of the cabinet or the removal of any permanently mo
40、unted subassembly or part. For electronic equipment, requirement 36 of MIL-STD-454 shall apply except that access shall be from the front. 3.1.8.1.1 Access doors and covers. 3.1.8.1.1.1 Large enclosures. Enclosures of 1-1/2 cubic feet (ft3) and larger shall have hinged doors which may be removable,
41、except for the doors on explosionproof enclosures. Hinges shall be attached such that they will not extend beyond the outer surface of the enclosure whether or not the doors are open. Doors on explosionproof, watertight, or submersible enclosures shall be secured by captive screws requiring the use
42、of tools. Doors on enclosures other than explosionproof, watertight, or submersible sha1.l be secured by captive thumbscrews or other slotted or cross recessed head type fasteners with all parts captive. Captive hardware shall be in accordance with MIL-E-917. Covers larger than 4 square feet (ft2) o
43、r weighing more than 35 pounds shall have handles attached for safe and easy installation or removal. 3.1.8.1.1.2 Small enclosures. Enclosures smaller than 1-1/2 ft3 may have removable covers without hinges provided that no electrical devices are mounted on the cover. Either captive or noncaptive fa
44、stener hardware may be used to secure doors and covers of small enclosures. 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-E-203bD 59 W 979790b 00078LO 9 W 3.1.8.1.2 Door and cover fastener hardware. Fasteners used to secure a cover or door sh
45、all be of the same type and size. Except where thumbscrews are required, head styles of door and cover screws and bolts shall be as follows: (a) Screws and bolts l/lr-inch diameter and larger: hexagon-head or (b) Screws and bolts smaller than 1/4-inch diameter: slotted head, slotted hexagon head. or
46、 cross recessed head, or any style specified in MIL-E-917. 3.1.8.1.3 Gaskets for covers and doors. Gaskets shall be provided for covers and doors of enclosures as required to meet the degree of enclosure. Gaskets may be provided for other enclosures at the option of the manufacturer. Unless otherwis
47、e specified in the equipment specification, gaskets shall be in accordance with NIL-R-900. Gaskets shall be secured to prevent dislodging or loosening when the door or cover is removed. Adhesive may be used for securing the gasket to one of the mating parts. An antistick material, such as powdered t
48、eflon compound, shall be applied to the unsecured face of gaskets. Silicone grease shall not be used. Antistick compounds shall be nongumming, nonhardening, nonflammable, and insoluble, and shall be thermally and chemically stable under the conditions of use, (see 30.2.2 for limitation for explosion
49、proof enclosures). 3.1.8.1.4 Hinged door or cover ground connections. Where energized parts are to be mounted on a hinged door or cover, the door or cover shall be connected to the enclosure structure by a low resistance, flexible grounding strap. The strap shall have a current carrying capacity at least as great as that of the largest lead to the.door mounted device. Reliance on mounting screws or hinges to complete the ground connection shal
