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TIA-607-B Standard

TIA-607-B states that a computer room should contain a supplementary bonding network grounded to the Telecommunications Grounding Busbar (TGB) or Telecommunications Main Grounding Busbar (TMGB).  Metallic components in need of bonding include racks, cabinets, ladders, surge protectors, cable trays, routers, switches and patch panels, each bonded to the TGB or TMGB using a minimum size conductor of 6 AWG. 


7.1.4 Cabinets and racks

Rack grounding busbars (RGBs) are recommended for cabinets and racks that need to support multiple unit (equipment) bonding conductors.  Cabinets, racks, and other enclosures in computer rooms shall not be bonded serially; each shall have their own dedicated bonding conductor to the bonding network, telecommunications grounding busbar, or telecommunications main grounding busbar. 


7.1.5 Cable ladders, cable runways, conduits, pipes, and building steel

In order to achieve the objective of potential equalization, ensure that cable runway/ladder sections are bonded together and that they are bonded to the TMGB/TGB. 


7.3.1 Telecommunications grounding busbar (TGB)

It is desirable that the busbar be electrotin-plated for reduced contact resistance.  The busbar shall be cleaned, and an anti-oxidant should be applied prior to fastening connectors to the busbar.  


7.3.3 Connections to the telecommunications grounding busbar (TGB)

The connection of conductors for bonding telecommunications equipment and telecommunications pathways to the Telecommunications Grounding Busbar (TGB) shall utilize listed compression two-hole lugs. 


7.5 Bonding racks and cabinets to the Telecommunications Equipment Bonding Conductor (TEBC)

The TEBC shall be connected to the cabinets/equipment racks, to the Rack Bonding Conductor (RBC) or to a vertical/horizontal Rack Grounding Busbar (RGB).  Properly sized Listed two-hole compression lugs or ground terminal blocks shall be used at this connection point. 


7.6 Structural bonding of racks/cabinets

All detachable, metallic parts of equipment cabinets (e.g. frame, door, side panel, top panel) shall be connected to ground, either directly by means of grounding/bonding jumpers or through the cabinet frame, to the connection point on the cabinet where the cabinet bonding conductor connects to the cabinet.  Removal of the paint from all bonding contact areas is recommended. 


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