Huawei USG6000E Series Hardware Manual page 605

HUAWEI USG6000E Series
Hardware Guide
Item
Grounding
resistance
Signal cable
layout
Collective
ground cable
Grounding
lead-in cable
A.1.5 Power Supply
Normal power supply is the prerequisite for proper running of the USG. This
section describes the requirements for power supply.
Basic AC Power Supply
The AC power supply system that consists of mains, uninterruptible power supply
(UPS), and self-provided generators should supply power in centralized mode. The
power supply system should meet the needs of the communications station, and
its cabling should be as simple as possible to facilitate operation and
maintenance. The low-voltage AC power supply system should use 3-phase 5-wire
or 1-phase 3-wire for power supply.
voltage and frequency.
Issue 08 (2022-04-20)
Requirement
Less than 1 Ohm
The upper end of the ground body must be no less than 0.7 m
from the ground. In cold regions, the ground body should be
buried under the frozen soil layer.
Measure the grounding resistance periodically to ensure that
the grounding works properly.
No overhead signal cable should exist in the communications
station. Signal cables should be led into the station from
underground.
The communications cables led into or out of the
communication station should be protected with metal
sheaths or laid out in metal pipes.
The ground cable of a lightning arrester should be as short as
possible. The unused wire pairs in the cables should be
grounded in the equipment room.
The main earthing conductor can be a cable grounding ring or
busbar.
Do not use aluminum materials as ground cables. Avoid
electrochemical corrosion when different types of metals are
interconnected.
Generally, a copper busbar with a cross-sectional area of no
less than 120 mm
resistance is used as the main earthing conductor. The main
earthing conductor must be insulated from the reinforcing
steel bar in the building.
The grounding lead-in cable must be no longer than 30 m. The
grounding lead-in cable should use galvanized steel with a
cross-sectional area of 40 mm x 4 mm or 50 mm x 5 mm.
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or galvanized steel with the same
Table A-4 lists the low-voltage AC nominal
A Appendix
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