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Grounding
Connection of an approved ground to the system cabinets is essential. An approved ground
may consist of any of the following:
● Grounded Building Steel - The metal frame of the building.
● Water Pipe - A continuous metal water pipe, not less than l/2 inch in diameter, that is
connected to an underground metal water pipe that is in direct contact with earth for
10 feet or more.
● Concrete-Encased Ground - An electrode encased by at least 2 inches of concrete and
located within and near the bottom of a concrete foundation or footing indirect contact
with the earth. The foundation must consist of at least 20 feet of one or more steel
reinforcing bars or rods of not less than 1/2 inch in diameter, or at least 20 feet of
bare, solid copper wire not smaller than No. 4 gauge.
● Ground Ring -A ring that encircles a building or structure indirect contact with earth
at a depth of at least 2-1/2 feet.
The ring must consist of at least 20 feet of bare
copper conductor not smaller than No. 2 gauge.
Lightning Protection
A Coupled Bonding Conductor (CBC) tie-wrapped to all trunks provides lightning protection.
The CBC can be any one of the following:
● A 16 gauge ground wire
● Continuous cable sheath
● Six unused pairs of wire
The CBC should be run from the telephone company provided network interface to the
system Cabinet 1’s ground block. If the telephone company has not extended the CBC from
the facility entrance to the network interface, the System 25 installer should run the CBC
along the same route as the incoming facilities, where feasible.
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