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APPENDIX VI
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LIGHTNING PROOF &
SURGE SIGNAL PROOF
The product adopts TVS lightning proof technology
to prevent from damage by lightning strike below
1500 W and impulse signals such as surge.
But it is also necessary to abide by the following
precautions to ensure electrical safety based on
practical circumstances:
Keep the communication cables at least 50 meters
away from high voltage equipment or cables.
Make outdoor cable laying-out under eaves as
possible as you can.
In open area shield cables in steel tube and conduct
a single point ground to the tube. Trolley wire is
forbidden in such circumstances.
In strong thunderstorm or high faradic zone (such
as high voltage transformer substation), extra
strong lightning proof equipment must be installed.
Take the building lightning proof requirements into
account to design the lightning proof and grounding
of outdoor equipment and cable laying-out in
accordance with the national and industrial
standards.
The system must be grounded with equal potentials.
The earth ground connection must satisfy the
anti-interference and electrical safety requirements
and must not short-circuit with the electricity net.
When the system is grounded separately, the
resistance of down conductor should be + 4
Ω
and
the sectional