MIL-STD-2042-2B(SH)
4.1.3.2 Holes drilled in beams. Holes drilled in structural members for passing cables or securing equipment shall be on the neutral axis of the beam or between the neutral axis and the point of attachment. Reinforcement of holes, where required, shall be in accordance with the applicable ship specification.
4.1.3.3 Welding. Unless otherwise noted, welding of studs, step hangers, tapped pads, mounting pads, and extension hangers shall be in accordance with NAVSEA Technical Publication S9074-AR-GIB-010/278. Any required tapping shall be done before welding.
4.1.3.4 Fasteners. Material for the bolts, nuts, machine screws and washers used to fasten boxes to decks and bulkheads shall be as specified in the ship specification and drawings, and in the methods described herein. Locking devices in accordance with ship specifications shall be used for bolts that secure the boxes. Through-bolts and self-locking nuts shall be used to mount boxes located:
a. In gun mounts.
b. In missile launch areas.
c. In submarine battery compartments above the level of the lowest cell tops.
4.1.3.5 Dissimilar metals. Where design requirements preclude the isolation of incompatible metal combinations, as identified in MIL-STD-889, from one another, the area in contact shall, as a minimum, be coated, treated, or otherwise insulated against corrosion in accordance with Appendix A of MIL-STD-889.
4.2 Cable entrance to equipment. Optical fiber cables shall enter equipment in accordance with the methods described herein and as follows:
a. Cables shall enter splashproof, spraytight, watertight, submersible, and explosionproof equipment through multiple cable penetrators (MCP's) integral to the equipment or through stuffing tubes. When stuffing tubes are used, entrance shall be made through the bottom or sides of the equipment where possible. Stuffing tubes used to enter splashproof, spraytight, or watertight equipment shall be nylon in accordance with ASTM F1836M. Stuffing tubes used to enter submersible (50 foot) and explosionproof equipment shall be metal in accordance with MIL-S-24235.
b. Cables shall enter molded plastic equipment through nylon stuffing tubes. c. The entrance of cables via connector plugs and receptacles shall be as
specified on the applicable ship or system drawings.
d. The entrance and grounding of electrical cables using MCP's integral to the equipment shall be as specified on the applicable ship or system drawings.
4.2.1 Cable slack. Cables shall be secured to ship structure as close as possible to the equipment without violating cable long term bend diameter (see 3.20) requirements. Cables entering hard-mounted equipment shall have sufficient slack between the equipment and the last point of cable support, to prevent damage to the cable caused by vibration. Cables connected to equipment provided with resilient or shock mounts shall have a minimum length of 46 cm (18 in) with not less than 8 cm (3 in) of slack between the equipment and the last point of support of the cable to provide for flexibility and movement of the equipment under shock, vibration, and
in-service loading. Cables terminated in a heavy duty (multiple terminus) connector shall have an additional minimum of 25 cm (10 in) of slack in the cableway from
which the cable exits to provide for two reterminations. For cables that enter equipment by way of stuffing tubes or MCP's, there shall be enough slack inside the
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