100 specifies that unlisted conductive optical fiber cables must have their non-current-carrying conductive members grounded. This simple step protects people and equipment from potential electrical shock. The critical distinction lies in. However, when optical fiber cable contains metallic components such as steel armor or strength members, it is necessary to ground and bond the fiber optic cable to reduce radiated and conducted electromagnetic emissions, as well as to dissipate electrostatic charges that would otherwise build-up on. Article 645 of the 2017 Edition of the National Electrical Code (NEC) covers equipment, power supply wiring, equipment interconnecting wiring, and grounding (bonding) of information technology (IT) equipment and systems in IT equipment rooms. Many other areas in the NEC apply to these rooms [Sec. Proper grounding is a cornerstone of NEC compliance for any conductive fiber optic cables. This prevents dangerous voltage surges—such as those from lightning strikes or accidental contact with. A separate HVAC system (dedicated to the room and equipment) must be provided. The room must be accessible to and occupied only by operators and maintainers of the equipment/system.