C120-H007-05EN 79
6.4 Grounding
6.4.2 Grounding other equipment

Table 6.6 summarizes the requirements for other equipment grounding facilities.

Table 6.6 Requirements for other equipment grounding facilities

Item Requirements
Grounding electrode • A dedic ated grounding electrode for other equipment is recommended.
If a dedicated grounding electrode is not available, a grounding trunk
cable may be branched from a shared grounding electrode.
• The grounding resistance must not exceed 100 Ω.
• Keep the grounding electrode at least 10 m (33 ft) apart from the lightning
arrester grounding electrode.
Grounding trunk
cable
• Use an insulated wire at least 5.5 mm2 (AWG10).
• Use the grounding trunk cable dedicated to other equipment. Do not share
with other facilities.
Distribution panel
grounding terminal
• Isolate the primary grounding terminal and branch grounding terminals
for other equipment from the distribution panel frame.