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BONDING EQUIPMENT TO INTERNAL GROUNDING (EARTHING) SYSTEM CHAPTER 5: INTERNAL GROUNDING (EARTHING)
• The SSGB bonding conductor shall be connected to the communication bonding backbone
conductor or to the grounding equalizer conductor with an exothermic welding or listed irreversible
compression-type connection (ANSI-J-STD-607-A-2002)
• When a grounding equalizer conductor is installed as described within this chapter, it shall be
bonded back to the SSGBs and not to the communication bonding backbone conductors.
• The grounding equalizer conductor shall be connected to the SSGBs with exothermic welding,
listed compression-type two-hole lugs, or listed irreversible compression type connections.
• Only the far end of a communication bonding backbone conductor may be connected directly to the
SSGB. If the communication bonding conductor is connected directly to the SSGB, it shall be
connected with exothermic welding or irreversible compression type connection. See Figure 5-4 on
page 5-7 for an example of this type of grounding system configuration.
5.5 BONDING EQUIPMENT TO INTERNAL GROUNDING
(EARTHING) SYSTEM
All equipment and ancillary support apparatus shall be bonded to the MGB, SSGB, RGB, ground
(earth) bus conductor or internal perimeter ground bus (IPGB) conductor with an equipment grounding
conductor as described within this chapter.
TABLE 5-6 BONDING TO THE INTERNAL GROUNDING SYSTEM FROM ITEM TOWARD EARTH
From To
Item MGB SSGB RGB
Ground
Bus
Conductor IPGB
Minimum Conductor Size Unless
Otherwise Specified
35 mm 2 csa
(#2 AWG)
SSGB ✔ ✔ ✔ ✔
RGB ✔ ✔ ✔ ✔ ✔
Equipment ground
bus extension
✔ ✔ ✔ ✔ ✔
16 mm 2 csa
(#6 AWG)
Equipment cabinet ✔ ✔ ✔ ✔ ✔
Equipment rack ✔ ✔ ✔ ✔
Equipment
grounding conductor
Individual system
component chassis
Control or Dispatch
Centers electronic
equipment and
metallic parts of
furniture
✔ ✔ ✔ ✔ ✔
✔ ✔ ✔ ✔ ✔
✔ ✔ ✔ ✔ ✔
5-40 68P81089E50-B 9/1/05