At0 Ground Impedance Test - Huawei eSpace IAD Troubleshooting Manual

eSpace IAD
Troubleshooting
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Table 3-13 Basic ground requirements
Requirements
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3.11 AT0 Ground Impedance Test

Ground Impedance Test Principles and Precautions
Background
A ground is a conducting connection between an electrical circuit or device and the earth
(generally a ground electrode in the earth) to discharge the system of current. The ground
system includes the ground electrode and ground cables.
Ground Types
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Issue 02 (2012-02-29)
Specifications
arranged indoor.
Do not extend the PGND cable, or add any switch or fuse.
The PGND cable used should be an alternating yellow and green plastic
insulating one with copper core.
Do not connect the neutral line of the AC power cable with the protection
ground of any telecom device in the equipment room.
The length of the PGND cable should not exceed 45 m and should be as short
as possible. If it is longer than 45 m, you can ask the user to replace the ground
bar nearby.
Ground mode
Joint ground. Connect the working
ground, PGND, and lightning protection
ground to the same group of ground
electrodes.
Ground impedance
≤ 10 ohms
Ground cable
The cross-sectional areas of PGND
cables are determined by the maximum
current. The cables must be efficient
conductor cables, for example, copper
cable. Bare connector cables cannot be
used.
PGND
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3 Co mmon Troubleshooting Methods
Effect
Standard and efficient ground is a major
measure to keep communication devices
stable. It protects people and devices from
static electricity, lightening, and
electromagnetic interference.
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