MIL-STD-1310H(NAVY)
5.2.2 Topside stowage. Stowage brackets, lockers, bins, or other stowage protected from the topside EME, shall be provided for portable and removable hardware used topside, such as: awning stanchions, flag and jackstaffs, accommodation ladders; wire rope slings, gripes, and stays, and tie-down chains/chocks when not in use. Deck stowage for metallic material not required for use topside shall be avoided.
5.2.2.1 Portable and removable metallic deck hardware. Portable and removable metallic deck hardware items shall be stowed when not in use on; sponson decks, inside covered companionways, below decks, or in stowage lockers and other protected areas isolated from HF transmitter antennas.
5.2.2.2 Other metallic material. Metallic items carried for stock, turn-in, or repair and not requiring immediate access, such as; angle iron, I-beams, pipes, sheet metal, barrels, argon-oxygen-nitrogen gas bottles, expended ordnance shell casings, etc., shall not be stowed topside near EM antennas.
5.2.3 Insulate topside metal-to-metal contact junctions. Unless isolating the item from ground will result in its becoming an RF burn hazard, insulating material shall be installed on the contact surfaces of built-in stowage brackets for metallic hardware items located in the topside EME whenever:
a. A suitable nonmetallic substitute is not available,
b. The items, such as; booms, dismountable highline stanchions and their stowage cradles, cannot be relocated from the topside EME, and
c. Insulation is preferable to, or the item is not suited to bonding.
5.2.4 Bond topside metal-to-metal contact junctions. Whenever metallic hardware in the topside EME is identified as a hull-generated EMI source, and the EMI is not resolved in accordance with 5.2.1, 5.2.2, or 5.2.3 above, the metal-to-metal contact junction shall be Class A, B, or C bonded in accordance with 5.1.2 and 5.1.3 as required to eliminate IMI/BBN.
a. Class A bond usage. Stationary metallic hardware items commonly installed topside, (such as life rails, stanchions, swab racks, etc.), shall be Class A bonded.
b. Class B or C bond usage. Portable and removable hardware items commonly installed topside, (such
as equipment cabinets, enclosures, and cases, dismountable lifeline and heavy weather stanchions, flagstaffs and jackstaffs, etc.), shall be Class B or C bonded when required for safety or IMI/BBN mitigation.
5.3 Cable and hull penetration EMI control.
5.3.1 Topside cable installations. All electrical and electronic system cables routed outside the skin of the ship shall be EM shielded or otherwise treated to prevent hull penetration EMI as described in the following paragraphs.
5.3.1.1 Shielded cable. Coaxial cables and cables with inherent overall shielding shall be grounded as follows:
a. Cable end terminations. Shielded cables shall be fabricated using the appropriate coaxial connector(s) or connector EMI backshells to bond the cable/coax outer braid/shield, or cable/conduit braid/shield 360 degrees at each end. The connector EMI backshells shall be in accordance with SAE-AS85049 or equivalent.
b. Hull penetration point. Shielded cables shall be 360-degree bonded at the point of entry into the hull, superstructure, deck, bulkhead, shielded compartment, or wireway trunk (see 5.3.2).
5.3.1.2 Unshielded cable. Unshielded cables that exceed 3 feet of exposed length in topside areas shall be
EM shielded or filtered as required to prevent cable penetration EMI.
a. Installed cable. Unshielded fixed-installed cables that exceed 3 feet of exposed length in topside areas shall have the entire exposed length routed within a wireway trunk, rigid (pipe) or flexible conduit. Use of rigid conduit is preferred to flexible metal conduit where practical.
b. Portable cable. Unshielded portable cables exposed in topside areas and exceeding 3 feet in length, such as those for sound-powered phone and remote handsets or headsets, shall have an EM filter installed when required (see figure 1).
5.3.1.3 Wireway trunks. Wireway trunks shall be constructed and installed as shown on figure 2.
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