MIL-STD-1310H(NAVY)
3.33 Trunk, wireway. A metal enclosure that provides EM shielding to the cables routed therein. One or more sides of the trunk may be ship's structure.
4. GENERAL REQUIREMENTS
4.1 Ground potential and ships ground plane. On both metallic and nonmetallic hull ships, ground potential shall be established and maintained in accordance with 5.1 as required for electrical and electronic equipment operation, EMC, EMP mitigation, and electrical safety. Class A bonding will be used to maintain the ship's ground plane.
4.2 Class B and/or C bonding. Class B and C bonding shall be used only as required for electrical safety, equipment operation, EMI mitigation, or EMP effects control.
4.3 EMP effects. Effects of EMP shall be prevented in accordance with 5.4 in those ships that have a specific requirement for EMP protection.
4.4 Electrical safety. All non-current-carrying metallic parts of electrical equipment shall be effectively grounded by one of the following methods:
a. Metal frames or enclosures of electrical receptacles and other apparatus shall be fixed to and be in metallic contact with the ship's structure, provided that the surfaces in contact are free from rust, scale, or paint when installed and are firmly bolted together.
b. Alternatively, they shall be connected to the hull either directly by ground strap or, for portable equipment, via the grounding terminal of a receptacle outlet.
A reading of 0.1 ohm (dc resistance) or less shall be achieved between an equipment enclosure and an adjacent structural ground potential point.
4.5 Bonding and grounding of composite structures. A Project Peculiar Document (PPD) shall be developed by the cognizant program manager for each composite structure developed for shipboard installation. The PPD shall be written to meet the intent of the requirements herein. The PPD will become effective when approved by the technical authority for this standard.
4.6 Introduction of new technology. Introduction of new technology and innovation is encouraged. However, application of new technology and innovations to satisfy the requirements herein shall be approved by the Technical Warrant Authority before being implemented.
4.7 Quality assurance inspection. A quality assurance in-process inspection shall be performed as specified (see 6.2).
5. DETAILED REQUIREMENTS
5.1 Ground potential and ship's ground plane(s).
5.1.1 Ground potential.
5.1.1.1 Ground potential for metallic hull ships. On metallic hull ships, the metal hull, when in contact with the water, shall establish and be designated as ground potential. When the ship is removed from the water, cognizant authority is responsible to ensure an appropriate ground is established and maintained.
5.1.1.2 Ground potential for nonmetallic hull ships. On nonmetallic hull ships, ground plate(s), installed to provide an earth ground connection via contact with sea water, shall be installed to establish ground potential. The ground plate(s) shall be installed at the lowest point of the structural hull, as close as possible to the vertical of the mast. A throughbolt shall be brazed to each ground plate to provide a connection point for installation of the cable grounding system ground plane (see Appendix C). When the ship is removed from the water, cognizant authority is responsible to ensure an appropriate ground is established and maintained.
5.1.2 Ground plane(s). For both metallic and nonmetallic hull ships, all Class A bonded (welded or brazed) extensions to ship's ground potential, topside and below decks, shall be designated as the ship's ground plane.
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