Sony FCB-CH7500, Руководство по эксплуатации, Страница: 50 / 51

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Annex II: Lightning and surge protection
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:

The signal line must be kept away from HV equipment or HV cable at least 50m

Try to wiring outdoor along the route under the eaves.

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.

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.

The outdoor devices and circuit lightning-proof and earth design must be combined with the lightning-proof requirements for buildings, and comply with
the relevant national and professional standards.

The system must be equal potentially earthed. The earth 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 earth impedance should be not more than 4Ω,
with the section area of earth conductor not more than 25mm
2
.