MIL-STD-2042-4B(SH)
4.2 Installation of optical fiber cables in cableways.
4.2.1 Cable pulling. Optical fiber cables shall be installed by feeding the cable through the cableway in a segment by segment fashion for the entire route and then securing it into the cableways. Block and tackle, chain falls, or other mechanical devices shall not be used to pull optical fiber cable. The cable shall be pulled to avoid kinking, twisting, sharp bending (see 4.2.3), or stretching by applying excessive pulling force. The optical fiber cable should be monitored at all bend points and at multiple points on long straight runs to ensure that the cable does not encounter sharp objects. It is recommended that the cable be pulled slowly, so that if it does get caught, it will be readily noticeable and cable pulling can be stopped before any damage occurs.
4.2.2 Cable pulling in armored cable cableways. Cableways containing armored cable should be avoided where possible. Where installation of optical fiber cables into cableways containing armored cable cannot be avoided, additional personnel shall be used to monitor during pulling due to the increased possibility for mechanical damage to the optical fiber cable.
4.2.3 Cable bend diameter. During handling and installation in cableways, cable bends in optical fiber cables shall not violate the minimum short term bend diameter (see 3.16) of the cable. The completed installation shall not violate the minimum long-term bend diameter of the cable. The installation of optical fiber cables at or below temperatures of 2oC (36oF) is not recommended. If cable must be installed when its temperature is 2oC (36oF) or lower, the cable shall be warmed thoroughly using a portable heater (or equivalent) before installing the cable in the cableway.
CAUTION: Continuously monitor the cable if it is directly exposed to the heat source. Prolonged exposure of the cable jacket to a temperature above
160oC (320oF) could cause damage to the cable jacket.
4.2.3.1 Conventional optical fiber cable minimum bend diameters. The minimum short-term bend diameter for conventional optical fiber cable is eight times the cable outside diameter. The minimum long-term bend diameter for conventional optical fiber cable is sixteen times the cable outside diameter.
4.2.3.2 BOF cable minimum bend diameters. The minimum short term and long
term bend diameter for the single tube BOF cable is 0.13 mm (5 inches). The minimum
short term and long term bend diameter for 7-tube BOF cable is 0.46 m (18 inches).
For 19-tube BOF cable the minimum short term bend diameter 1.0 m (39 inches) and the
minimum long term bend diameter is 1.27 m (50 inches).
NOTE: The minimum bend diameters identified are associated with tube cable bend damage limits. Installation of single tube cables at the minimum bend diameter may result in severe blowing limitations. Maximize BOF tube bend diameters to the greatest extent practicable.
NOTE: BOF tube bend diameters less than 18 inches will negatively impact the blowing distances achievable for 12 and 18-fiber BOF bundles.
4.2.4 Installed cable slack. Cables shall be installed in accordance with the following:
a. Sufficient slack shall exist to allow for deflection of bulkheads.
b. The sag between hangers shall be uniform for each row of cables so that clearance between rows will be the same throughout the cable run.
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