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CONNECTION METHODS FOR INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING)
P A N I
Surge
Producers
RF SPD
AC Equip.
Tel. SPD
Cable Shields
ESD
Surge
Absorbers
Building Steel
AC NG Bond
Water Line
Metallic Piping
Concrete Encased
Electrode
Ground Rings
Non IGZ
+48VDC GND.
-24VDC GND.
Cable Tray Sys.
Equip. Frame
Battery Racks
Anciliary Equip.
FIGURE 5-24 PANI BUS BAR CONFIGURATION
Isolated
Ground
Zones (IGZ)
Logic Ground.
IG Zones
5.4.4 BONDING TO GROUND (EARTH) BUS CONDUCTORS
All applicable general bonding requirements shall apply when attaching ground (earth) bus extension
conductors and equipment grounding conductors to a ground bus conductor. The following
requirements also apply:
• All ground bus conductors should be installed without splices. Where splices are necessary, the
number of splices should be kept to a minimum and they shall be accessible and only located in
telecommunication spaces. The joined segments shall be connected using exothermic welding or
listed irreversible compression-type connectors. All bonding joints shall be adequately supported
and protected from damage (ANSI-J-STD-607-A-2002).
• Ground bus extension conductors shall always be routed toward the MGB or SSGB at the point of
connection to the ground bus conductor. Ground bus extension conductors shall be connected to the
ground bus conductor using exothermic welding or listed irreversible compression-type connectors.
Connection points shall be taped with a suitable green tape or otherwise isolated from contact with
the cable tray or other metallic surfaces.
• Equipment grounding conductors shall always be routed toward the MGB or SSGB at the point of
connection to the ground bus conductor. Equipment grounding conductors shall be connected to the
ground bus conductor using exothermic welding, listed compression-type connections, or listed
split bolt connections. Connection points shall be taped with a suitable green tape or otherwise
isolated from contact with the cable tray or other metallic surfaces.
• Equipment grounding conductors shall be connected so that the removal of a connection will not
break the ground path to any other piece of equipment or ancillary support device that may have
electrical power applied.
• Multiple connections shall not be made to one attachment point on the ground bus conductor
unless this connection is made using exothermic welding, listed irreversible compression-type
connector or listed split bolt. In all cases the connection means shall be listed for the size and
number of conductors to be connected.
5-38 68P81089E50-B 9/1/05