Tadiran Telecom Coral IPx 500, Quick Installation Manual

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General System Description and Installation
1-39
General System De
script
ion and Installation
1
Grounding
Proper system grounding is critical to reliable system operation. System grounding is
only as effective as the ground point itself. To ensure adequate protection from
interference by radio frequency energy, electrical impulse noise, and lightening or
power line surge, the building electrical ground point must comply with grounding
recommendations of the National Area Code, Article 800, and/or applicable local
building and electrical codes.
The object of ground circuit design is to establish a low resistance path to the earth,
and to conduct a multitude of currents in such a way as to minimize the interaction of
any two or more currents. In essence, the ground connection is used as a common
conductor for many circuits: some carrying wanted signals, and others carrying
unwanted signals. The same ground that carries small networking currents must also
carry unwanted radio frequency energy, impulse noise, and lightening surges that
might otherwise interfere with system operation.
Grounding the Cage
The cage ground wire is connected to the cage in the top section. A ring terminal is
connected with a serrated washer and a nut. The other end of the wire is connected to
the master ground. The master ground is connected to the building ground. In a
multi-cage configuration, each cage is connected directly to the master ground.
1. Verify that a master ground unit for ground connections (
Figure 1-29
) is used.
The recommended master ground unit must have the following specifications:
Dimensions:.......................Minimum of 5.5
”
x ¼
”
x 1
”
(140 mm x 6 mm x 25 mm)
Material:.............................Brass or Copper
Mounting holes:................¼
”
(6 mm) diameter, ½
”
(12 mm) distance from edges
Ground screws:.................10-32 UNF
Washers...............................One serrated washer above the ring terminal
Distance between screws:.....¾" (18 mm)
Electrical Hazard! Connect only a Protective Earth (PE) to the Coral IPx system.
Do not connect a separate Telecommunications Reference Conductor (TRC).
Resistance from the master ground to the building electrical ground should never
exceed 1.0 ohm. The master ground bar should be located in the switching room as
close as possible to the Coral. Any ground connection of equipment related to the
switching Coral system should ultimately connect to the master ground.