Harting Sbírka katalogů říjen 2013

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Vydal: HARTING s.r.o. Autor: HARTING

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Contamination caused water, soot, metal coal dust is always conductive. with surge arrestors). Equipment this overvoltage category primarily operated low voltage. This includes equipment for permanent installations, e. rule, contamination becomes conductive when mixed with water.3 Degree pollution (based VDE 0110-1 and IEC 60664-1) The micro-environment determines how contamination affects the insulation.Insert 161 4. Macro-environment:Environment room other location which the equipment installed operated. Domestic electrical appliances are included this category, for example. Here, transient overvoltages not have taken into consideration,but because special demands placed this equipment with regard the safety and availability and the networks that depend it, overvoltage remains factor for consideration.g.2 Overvoltage categories Equipment divided into one the following excess voltage categories: Overvoltage category I Equipment intended for use devices parts plants where overvoltages cannot occur, which are protected with suitable measures against such overvoltages (e. Overvoltage category IV Equipment intended for operation plants, parts thereof, where transient overvoltage has taken into consideration. . This includes equipment connected overhead lines, e.g. control devices, meters. protective devices, contactors, switches and outlets. Overvoltage category III Includes equipment intended for the operation plants parts thereof. Small clearance distances can bridged completely solid particles, dust or water. Micro-environment: Immediate surrounding the insulation, which especially influences the creepage distance rating. Overvoltage category II Equipment intended for operation plants, parts thereof, where transient overvoltages not have taken into consideration; but where overvoltages caused operation equipment may occur.6.g.1. This circumstance has led the specification minimum clearance distances. 4.6. However, the macro-environment should also considered.1