MIL-STD-1310H(NAVY)
a. Built-in grounding through a 3-conductor power cord and 3-pronged plug for electrical equipment with a conductive case or exposed conductive elements.
b. Use of a non-conducting enclosure/case. Electrical equipment with a double-insulated or non- conductive case needs no safety ground.
5.7.1.1 Electrical equipment with a conductive case. Portable or mobile-transportable electrical equipment with a conductive case or exposed conductive elements shall require a 3-conductor power cable and 3-pronged plug. The third conductor shall be attached to the ground prong of the plug and the equipment frame or chassis. For acceptance, an insulation resistance test shall determine:
a. 1 megohm (minimum) resistance between the conductive case and each active power conductor prong. b. 0.1 ohm (maximum) resistance between the conductive case and the power cord ground prong.
5.7.1.2 Electrical equipment with a non-conductive case. Portable or mobile-transportable electrical equipment with a non-conductive case requires no electrical safety ground. Unless a grounding wire is required for EMI control, a 2-conductor power cord and 2-pronged plug is acceptable.
5.7.2 Fixed-installed, electrically-powered equipment. Shock hazard protection for fixed-installed, electrically-powered equipment to be used aboard ship shall be provided through:
a. A hard-wired power cord.
b. The mounting hardware to provide Class B or C bonding to ground. c. Use of a non-conducting enclosure/case.
d. A combination of a through c above.
5.7.3 Fixed rack mounted or enclosure mounted electrically powered equipment. Shock hazard protection for equipment, including COTS and NDI equipment, installed in a rack mount or internal to an equipment enclosure shall be provided through one of the grounding methods or combinations of methods stated in 5.7.1 or 5.7.2.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. This standard specifies EMI/IMI reduction techniques, EMP protection measures, personnel safety grounding requirements and methods for installing shipboard cable ground systems. Appendix A provides guidance concerning installation and testing associated with EMI control.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a. Title, number, and date of this standard.
b. Quality assurance provisions (see 4.7 and 6.3).
6.3 Quality assurance provisions.
6.3.1 In-progress inspection. An in-progress inspection conducted to assess the shipboard bonding, grounding, and other techniques for EMC, EMP mitigation, and safety as specified by this standard. This inspection consists of spot checking installation procedures, methods, and materials to determine compliance with the applicable requirements specified herein. The inspection is to determine the following:
a. Bond straps, non-metallic materials and ground systems are installed in accordance with requirements for personnel safety.
b. Quality materials, methods, and workmanship are used.
c. Each installation will satisfy the intent and purpose of the requirement.
d. Class of bond, and type of bond strap (for Class C) is as specified herein. e. Installation of strap does not interfere with tightness of enclosure.
f. Installation of strap does not weaken structure or item to which the strap is attached.
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