Overview of Telecommunications
Bonding & Grounding Systems
Item
#
6
Telecommunications
Room (TR)
Telecommunications
Room (TR)
TGB
Telecommunications
Room (TR)
Description
Part Number
1
Telecommunications
Grounding Busbar (TGB)
2
Telecommunications Main
GBI14420TGB
Grounding Busbar (TMGB)
3
Bonding Conductor for
#6 AWG up to #750 MCM
Telecommunications (BCT)
4
Grounding Electrode
Conductor
#6 AWG up to #750 MCM
5
Grounding Electrode
System
Ultraweld connection to
ground conductor & ground
rod
6
Grounding Equalizer (GE)
#6 AWG up to #750 MCM
7
Telecommunications
Bonding Backbone (TBB)
#6 AWG up to #750 MCM
GBI14220TGB
TGB
7
Telecommunications
Room (TR)
7
TGB
TGB
Equipment Room (ER)
Electrical Entrance Facility
7
2
1
5
Telecommunications Entrance Facility (TEF)
607B201117BG
Courtesy of
3
4
Sizing the Grounding Equalizer (GE)
‡The GE shall be, as a minimum, the same
size as the largest TBB.
#6 AWG up to #750 MCM
Grounding Equalizer (GE).
# RGBV145872A
Equipment Rack Grounding Busbar.
#GBI14220TGB
Telecommunications Grounding Busbar (TGB).
#6 AWG up to #750 MCM
Telecommunications Bonding Backbone (TBB).
607B201127GESing
Courtesy of
Equipment Rack Bonding
#6 AWG up to #750 MCM
TEBC (TELECOMMUNICATION EQUIPMENT BONDING CONDUCTOR).
TO TMGB / TGB
#6 AWG up to #750
MCM RACK BONDING CONDUCTORS
ROUTED TO TMGB / TGB
# CT4666 THRU CT4/04/0
IRREVERSIBLE CRIMP CONNECTOR.
# RGBH14119.25
TOP MOUNTED RACK
GROUNDING BUSBAR.
# RGBV145872A
VERTICALLY MOUNTED RACK
GROUNDING BUSBAR.
# UBC61411/410 THRU UBC63811/410
UNIT BONDING CONDUCTOR (UBC)
# UBC61411/410 THRU
UBC63811/410
INDIVIDUAL UNIT BONDING
CONDUCTORS (UBC) FROM EACH
PIECE OF EQUIPMENT TO THE
RACK BONDING CONDUCTOR.
INDIVIDUAL EQUIPMENT GROUNDING
TERMINAL (TYPICAL EACH PIECE OF
EQUIPMENT)
RACK BONDING CONDUCTOR
EXTENDED TO BOTTOM OF RACK
TO ACCOMMODATE FUTURE
GROWTH
MINIMUM BENDING RADIUS MUST BE
MAINTAINED ON ALL CONDUCTORS
Example “A”
Example “B”
Example “C”
Example of three methods to bond equipment racks to ground.
607B201138ERB
Courtesy of
Grounding Equalizer (GE)
‡ When two or more TBB’s are used in a multistory building,
the TBB’s shall be bonded together with a GE at the top
floor and at a minimum of every third floor in between to
the lowest floor level.
Grounding Equalizer (GE)
Part # RGBH14119.25
TGB
TGB
Part # GBI14220TGB
Part # RGBV145872A
Part # GBI14220TGB
Telecommunications Bonding
Backbone (TBB)
607B201151GE
Courtesy of

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