COP-USA ASH56NVIR-36S - Manual (Page 42)

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Annex IV: protection against lightning and surge
This product adopts TVS pole lightning-proof technology to effectively protect against the
damages of pulse signals such as transient lightning below 1.5KW, and surge etc to
equipment. However, if mounted outdoor, the necessary protective measures must be
provided as required:
z The signal line must be kept away from HV equipment or HV cable at least 50m
z Try to wiring outdoor along the route under the eaves.
z At open space, the wiring must be buried with closed steel pipe; the steel pipe should
be earthed at one point, strictly forbid to use the aerial wiring.
z At high thunderstorm area or high induction voltage zone (such as HV substation),
the protective measures such as adding of additional high power lightning-proof
device and lightning arrestor etc must be used.
z The outdoor devices and circuit lightning-proof and earthing design must be
combined with the lightning-proof requirements for buildings, and comply with the
relevant national and professional standards.
z The system must be equipotentially earthed. The earthing device must comply with
both system anti-interference and electrical safety requirements, and not short-circuit
or mixed with zero line of strong current grid. When the system is individually
earthed, its earthing impedance should be not more than 4Ω, with the section area of
earthing conductor not more than 25mm 2 .