Inner diameter of copper optical cable
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A 144 fiber loose tube cable is typically 15-16mm diameter while a comparable micro cable is only about 8 mm diameter - half the size and about one-third the weight. The smaller size allows for much larger fiber counts, over 3,000 fibers in some designs. Breakout cables normally contain a ripcord, two non-conductive dielectric strengthening members (normally a glass rod epoxy), an aramid yarn, and 3 mm buffer tubing with an additional layer of Kevlar surrounding each fiber. Cable diameter refers to the overall outer measurement of a conductor or finished cable, while cross-sectional area (typically in mm² or circular mils) defines the conductive portion responsible for current flow. Note that the term Fibre is used in the ANSI Fibre Channel Standard documents to denote both copper and optical fiber media. The cable must meet the requirements of the National Electrical Code® (NEC)® 70 Article 725, Article 800, and Article 770.