Chapter 6 Power Supply Cables Installation
F
IGURE
81 AC D
ISTRIBUTION
S
YSTEM
G
ROUNDING
Grounding Wire Installation
Grounding Wire Interconnection
inside the Cabinet
The digital ground, working ground and protection ground are in-
tegrated into one.
The working ground and protection ground are connected inside
the cabinets in the factory.
The cabinet is connected to the GNDs with grounding conductors
in the factory.
Electrostatic discharge (ESD) facilities are provided between the
doors and the cabinet. Doors and cabinet are connected with soft,
copper grounding conductors with a length of 0.3m and a diameter
of 3 mm, ensuring the low connection resistance less than 0.2 MΩ.
ESD facilities are also provided between plug-in boxes and cabinet.
All the cabinet surfaces are zinc plated and color passivated. The
series of openings on the angle rail for mounting plug-in boxes and
the contact point between the angle rail and the cabinet should be
provided with conductive protection, which provides a proper ESD
protection between the plug-in boxes and cabinet through vertical
posts.
Grounding Wire Interconnection
between Cabinets
When a joint ground is used, make sure the electric potentials of
all the cabinet grounds are equal. Interconnect the cabinet shells
using knitted strips or conductive copper wires. The cross sectional
area of the interconnecting wire is 10 mm
2
.
Confidential and Proprietary Information of ZTE CORPORATION
85
Summary of Contents for ZXR10 8900 Series
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