Fiber optic cable has many ad- vantages over competing technologies, including increased information capacity (by orders of magnitude), reduced ancillary equipment requirements in key applications, immense scalability and expandability with the same infrastructure, and electromagnetic noise immunity. For these reasons and others, fiber-optic cable installations are becoming increasingly common. Art. 770 covers the installation of optical fiber cables used to transmit light for control, signaling, and communications. Further, it contains the installation requirements for optical raceways, which contain and support the optical fiber cables. It also contains the requirements for composite cables, often called "hybrids," which combine optical fibers with current-carrying metallic conductors.
展开▼
