MIL-STD-2042-4B(SH)
4.4 Cableways. Cableways shall be in accordance with MIL-STD-2003-4 and as specified herein.
4.4.1 Spare cable allowance. In the organization of principal cableways, spare cable space of approximately 20 percent of that to be occupied by the final combined electric and optical fiber cable installation (as known at the time of delivery of the ship) shall be reserved on tier bars of cable hangers and in electric and optical fiber cable penetration areas for future cable installations. The additional cable space may consist of unused hangers or a combination of unused hangers and space available on used hangers, assuming that double banking will be allowed for future optical fiber cable (see 4.2.8). During the planning phase, the Contractor shall provide cableway space in excess of the required 20 percent, in order to accommodate electric and optical fiber cables added as a result of design development occurring during the construction period.
4.5 Fiber optic cable topology test. The fiber optic cable topology shall be tested for continuity and loss during various stages of installation in accordance with Part 6 of this standard practice.
4.6 BOF bundle and BOF fiber installation. BOF bundles and BOF fibers shall be installed in accordance with the manufacturers recommended procedures using the equipment recommended by the BOF bundle and fiber manufacturer. BOF cables and components shall not be exposed to compressed gas pressures greater than 138 MPa (200 PSI) during BOF bundle and fiber installation. Single mode and multimode optical fibers may both be installed in the same BOF cable. When both single mode and multimode optical fibers are installed in a BOF cable, the single mode optical fibers shall be installed in different tubes from the multimode optical fibers.
4.7 Safety precautions. The following safety precautions apply:
a. The classification of a laser is based on the ability of the optical beam to cause damage to the eye. Under normal operating conditions, an optical fiber communication system (OFCS) is inherently an eye safe system; but, when an optical fiber connection is broken and optical viewing instruments are used, it is possible that hazardous energy can enter the eye. For
this reason four service group hazard classes have been devised to
indicate the degree of hazard and required hazard control measures. Refer
to ANSI Z136.2 for a full technical definition. The following laser
safety precautions shall apply:
(1) Ensure personnel are familiar with the laser degree of hazard and the required control measures.
(2) Light generated by light emitting diodes (LED's) and laser diodes may not be visible but may still be hazardous to the unprotected eye. Never stare into the end of an optical fiber connected to an LED or laser diode and do not stare into broken, severed or disconnected optical cables.
(3) Do not view the primary beam or a specular reflection from an OFCS with an optical microscope, eye loupe or other viewing instrument. The instrument may create a hazard due to its light gathering capability.
b. Safety glasses shall be worn when handling bare fibers. Always handle cable carefully to avoid personal injury. The ends of optical fibers may be extremely sharp and can lacerate or penetrate the skin or cause permanent eye damage if touched to the eye. If the fiber penetrates the skin, it most likely will break off, in which case the extraction of the
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