Manholes are large underground chambers designed to allow technicians to enter for maintenance, splicing, and inspection of fiber optic networks. They are typically constructed from reinforced concrete for durability and water resistance, and may include ladders or steps for safe access . Manholes provide space for storing cable slack, performing splicing, and accessing main backbone routes .
1. Use of Innerducts: Fiber optic cables are often placed inside innerducts within the manhole to provide a continuous, smooth path and prevent abrasion or crushing. Innerducts can be continuous through the manhole or interrupted, but they should be secured to prevent movement during cable placement . Multiple innerducts can be installed in a single conduit to allow for future expansion . 2. Maintaining Minimum Bend Radius: Cables must be installed without exceeding their minimum bend radius, both during installation and after placement. For example, a cable with a 0.46-inch diameter may require a minimum working bend radius of 6.9 inches (17.7 cm) during installation . Proper racking and careful routing inside the manhole help maintain these limits. 3. Cable Slack and Racking: Slack should be stored in a manner that avoids sharp bends or kinks. Racking should provide maximum protection and maintain the cable's bend radius. Figure-eight coiling is recommended for temporary slack, with loops typically 5–8 feet in diameter . Cardboard shims can be used at crossover points to relieve pressure. 4. Environmental Protection: Manholes may contain water, debris, or petroleum-based waste. Fiber optic cables with polyethylene jackets can be damaged by petroleum products, so special protection or isolation may be required . Barricades should be used when cables are temporarily placed on the surface to prevent pedestrian or vehicular damage. 5. Pulling and Tension Control: During installation, the maximum rated cable load (MRCL) must not be exceeded. Use of breakaway swivels, hydraulic pressure relief valves, or electronic tension control systems is recommended to prevent over-tensioning . Pulling should ideally proceed from higher to lower elevation manholes to reduce stress on the cable . 6. Safety and Access Considerations: Technicians must have safe access to manholes, with ladders and proper shoring if required. Adequate lighting, barricades, and supervision are essential to prevent accidents during installation or maintenance .
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