1. System Installation Requirements
1-28
TI 33Q01J10-01E
Grounding with Lightning Arresters
Connect the grounding terminals of arresters and CS 3000 equipment to the grounding pole
as shown in the diagram below. Leading the ground cable from an arrester to equipment or
grounding them to separate buses may result in loss of protection capability. Be sure to connect
the ground cable from equipment to an arrester and connect the arrester to a ground bus. Use
type 10 ohms or less or type 100 ohms or less.
Concatenation grounding a lightning arrester and other equipment may cause high-tension in
each equipment by the product of lightning current from arrester and grounding resistance. To
prevent from electrification, overall connection should be equipotential including the floor and the
case of other equipment.
F010504.ai
Arrester
FCU
10 ohms or less recommended or 100 ohms or less
Grounding bus
To FCU grounding bar
Grounding bar for connecting
grounding conductor
Connection to grounding bar
Shield the cable
Cabinet internal shield ground bar
(with an insulated board)
Figure Grounding with Lightning Arresters
Feb. 1, 2009-00