• 5.1.1 GENERAL
    Lightning protection of telecommunications facilities is essential. While federal and state standards must be adhered to, local conditions may require additional investigation and/or modifications to meet site, equipment, environmental or safety requirements.
    NEC Articles 250 "Grounding" and 800 "Communications Circuits" cover general requirements for grounding, bonding and protecting electrical and communications circuits. NFPA 78 "Lightning Protection" addresses zone protection and other items which are beneficial.
    All cabling (including grounding to building ground) within the building and entrance facilities shall be installed with protection from lightning and power surges via grounding and bonding.

  • 5.1.2 MATERIALS
    The three most frequently used lightning protectors are listed below. Consult Telecommunications Center for a determination of the most appropriate protection for the condition.
    • AT&T Protector -- AT&T, part number 189B1-25 for 25 pair protection
    • AT&T Protector -- AT&T, part number 189B1-50 for 50 pair protection
    • AT&T Protector -- AT&T, part number 189B1-100 for 100 pair
    Use AT&T, part number 3B1E-W gas protector modules.
    Homaco part number 50M-201-____19 rack mounting shall be provided. (ITCS will specify part number suffix required for the particular application.)
    RELTEC Protection Block -- part number R66P25QCVS. The gas protection module shall be AT&T, part number 3B1E-W.
    Use AT&T, part number 110ANA1-06 for single drops of 6-pair or less. Use AT&T, part number 3B1E-W gas protector modules.


  • 5.2.1 GENERAL
    All MC grounding shall use a single point scheme from the building main transformer. EIA/TIA 607 requirements must be followed.
    All shields shall be bonded to a common ground.
    All riser cable must be shielded and properly grounded to the building ground through grounding facilities provided at the MC (Main Cross-connect Room).
    All protector blocks shall be connected to the backboard ground busbar using NEC code 6 AWG copper wire.


  • 5.3.1 GENERAL
    Bonding is to be durable, strong and of low impedance to assure electrical continuity. EIA/TIA 607 requirements must be followed.
    All conduit terminating to cable trays and wireways shall be mechanically fastened to the tray clamps or equivalent. The cable tray or wire way shall be grounded to the main building grounding system with a wire not smaller than #6 AWG copper.
    A resistance of .001 ohm or less indicates a high-quality junction and is required per the Building Industry Consulting Services International (BICSI) Telecommunications Distribution Methods Manual.