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Ⅲ
Appendix
Ⅰ
: Lightning Proof and 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:
l
Keep the communication cables at least 50 meters away from high voltage equipment or
cables.
l
Make outdoor cable laying-out under eaves as possible as you can.
l
In open area shield cables in steel tube and conduct a single point ground to the tube.
Trolley wire is forbidden in such circumstances.
l
In strong thunderstorm or high faradic zone (such as high voltage transformer substation),
extra strong lightning proof equipment must be installed.
l
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.
l
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 circuited
with high voltage electricity net. When the system is grounded separately, the resistance
of down conductor should be ≤ 4Ω and the sectional area of down conductor should be
≤25mm2
Figure 25
