Harting Sbírka katalogů říjen 2013

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

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g. Overvoltage category III Includes equipment intended for the operation plants parts thereof. Contamination caused water, soot, metal coal dust is always conductive. Overvoltage category IV Equipment intended for operation plants, parts thereof, where transient overvoltage has taken into consideration. This includes equipment for permanent installations, e.g. 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. with surge arrestors). . Macro-environment:Environment room other location which the equipment installed operated. 4. protective devices, contactors, switches and outlets.1.Insert 161 4. Small clearance distances can bridged completely solid particles, dust or water. 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.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.6. This circumstance has led the specification minimum clearance distances. Domestic electrical appliances are included this category, for example. Equipment this overvoltage category primarily operated low voltage. rule, contamination becomes conductive when mixed with water.1. This includes equipment connected overhead lines, e.6. However, the macro-environment should also considered. control devices, meters. Micro-environment: Immediate surrounding the insulation, which especially influences the creepage distance rating.3 Degree pollution (based VDE 0110-1 and IEC 60664-1) The micro-environment determines how contamination affects the insulation.g