Harting Sbírka katalogů říjen 2013

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Special Applications 189 OV like but with lower requirements Definition - Circuits with enhanced availability requirements Examples: - Power distribution systems installations - Lines outside buildings protected additional provisions for protection OV Circuits which are directly connected the contact outside lines, without any protective devices against overvoltages close the connection point and which may endangered lightning or switching overvoltages Example: - Lines outside buildings protected only inherent protection 5.1: Dust deposit Humidity PD pollution, non-conductive, well protected dry; no condensation PD noil-conductive, protected, temporary conductivity caused condensation rare, short temporary condensation PD low conductivity (caused condensation) frequent condensation PD low conductivity damp, long time condensation PD occasionally conductive, with periodic cleaning rain, snow, ice PD occasionally conductive, coming from heavy pollution rain, snow, ice PD occasionally conductive, coming from very heavy pollution rain, snow, ice * fixed installations only .2 Definition degrees pollution, based VDE 0115 Table 5.2.1