Particulars of system, i.e. nominal and highest voltages, frequency, number of phases and details of neutral earthing. Service conditions, including min and max ambient, air temperatures, altitude from sea level. Characteristics of a disconnector or earthing switch: disconnector switch model(HCB,VERTICAL,PANTOGRAPH,…) number of poles; installation: indoor or outdoor; rated voltage; rated frequency; rated normal current (for disconnectors only); rated peak and short-time withstand currents; rated short-circuit making current, if any (for earthing switches only). duration of short-circuit rated static and dynamic mechanical terminal loading how to install and height of the blade from the ground mechanical class(M1,M2) creepage distance of disconnecto rswitch insulator Characteristics of the operating mechanism and associated equipment, in particular: method of operation, (manual or motor) the type of available supply energy (e.g. compressed air, or electrical d.c. or a.c.) and its ratings (pressure, voltage, frequency), number and type of auxiliary contacts. Advertisement
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