MIL-STD-1310H(NAVY) APPENDIX B
B.3 COMMERCIAL QUALIFICATION DOCUMENTATION
B.3.1 COTS and NDI equipment. COTS/NDI electrical and electronic equipment procured for shipboard use may not have been tested to determine whether it meets shipboard electrical safety requirements. As a result of ongoing DoD acquisition initiatives, COTS/NDI electrical equipment procurements should meet MIL-STD-882. Reports of any safety and EMC testing should be requested with the procurement of COTS or NDI equipment.
B.3.2 Testing results. The results of any testing performed by national or international standards development organization (SDO), such as; the Underwriters Laboratories (UL) in the United States and Canada, the Verbad Deutscher Elektrotechniker (VDE) of Germany, etc., shall be included with the technical data supplied for COTS/NDI electrical and electronic equipment procured for shipboard use. These reports can be used to determine risks associated with integration of the items for shipboard application.
B.4 ELECTRICAL SHOCK HAZARD PROTECTION REQUIREMENTS
Requirements for electrical shock hazard protection for portable and mobile-transportable electrical equipment and fixed rack mounted or enclosure mounted COTS/NDI equipment, are dependent on whether the equipment case is nonconductive or conductive.
B.4.1 Double insulated and non-conducting equipment. Double insulated and non-conducting equipment that is exempted in accordance with B.4.1.1 and B.4.1.2 below need not be grounded.
a. A 2-conductor power cord and 2-pronged plug is acceptable.
b. If initially provided with a 3-conductor power cord and 3-pronged plug for grounding, this type cord and plug shall be retained for the life of the device.
B.4.1.1 Double insulated equipment. Double insulated (UL listed) electrical equipment having the words
"double insulated" or "double insulation" stamped on its enclosure/case shall require no grounding.
B.4.1.2 Non-conducting equipment. Electrical equipment with a non-conducting enclosure/case that is not stamped "double insulated" may be exempted from the requirement for a grounding conductor, provided that the equipment:
a. Case and handle is made of non-conducting material, and b. Meets both of the following requirements:
(1) Passes an initial inspection for rugged, safe construction, and
(2) Has a minimum of 1 megohm DC resistance from any phase conductor to any exposed metal part (such as chuck housing, mounting screws, ear plug jacks, or antennas) or metal chassis.
B.4.2 Equipment with a conductive case or exposed conductive elements. Electrical equipment with a conductive case shall be grounded via a 3-conductor power cord and 3-pronged plug.
B.4.2.1 Installation requirements; 3-pronged plug. Electrical equipment with a conductive case or exposed conductive elements that are supplied with a 3-conductor power cord and 3-pronged plug shall not require additional grounding for electrical safety. Portable electrical equipment that has a 3-pronged plug shall not require additional grounding for EMI control.
B.4.2.2 Installation requirements; 2-pronged plug. Electrical equipment with a conductive case or exposed conductive elements that are supplied with a 2-conductor power cord and 2-pronged plug shall have the power cord and plug replaced with a 3-conductor cable of appropriate capacity and 3-pronged plug.
a. The third conductor shall be attached to the ground prong of the plug and the equipment chassis where the following conditions can be met:
(1) Where it is determined that a ground conductor can be conveniently connected to exposed metal parts on the equipment chassis.
(2) The modification does not compromise the equipment operation. (3) The modification does not compromise the enclosure integrity.
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