Tadiran Telecom Coral IPx 500, Руководство по установке

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2-46
Coral IPx 500 Installation Manual
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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
groundground, 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.
The ground connection includes an M4 threaded terminal pole that is fixed onto the
surface of the top section (by the manufacturer), a serrated washer between each
terminal connection, a flat washer, and an M4 nut.
The cage ground wire is connected to the cage in the top section, as described on
page
2-47, Connecting the Ground Wire to the Cage
.
6 Ground Wiring
Electrical Hazard. Incorrect ground wire connections to the system can cause shock,
burn, or death.
•Verify that the ground wires are 10 AWG stranded conductor.
•Verify that all ground connections of locally supplied MDF units are made directly
from the cage ground connection to the master ground.
• Do not interconnect cage ground terminals between Coral IPx cages.
•Ring terminals retain wires onto the terminal lug when the connection is loosened.
Verify that all ground wires include ring terminals at both ends.
•Verify that the ring terminals connecting to the cage and to the MDFipx are suitable for
M4 fasteners.
•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 or MDFipx 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 system. Any ground connection of equipment related
to the switching Coral system should ultimately connect to the master ground.