DS/EN 50470-1:2007

Electricity metering equipment (a.c.) - Part 1: General requirements, tests and test conditions - Metering equipment (class indexes A, B and C)

This European Standard applies to newly manufactured watt-hour meters, measuring active electrical *energy, intended for residential, commercial and light industrial use, for use on 50 Hz electrical *networks. It specifies general requirements and type tests methods. *It applies to electromechanical or static watt-hour meters for indoor and outdoor application, consisting of a measuring element and register(s) enclosed in a meter case. It also applies to operation indicator(s) and test output(s). *If the meter has (a) measuring element(s) for more than one type of energy (multi-energy meters), or *when other functional elements, like maximum demand indicators, electronic tariff registers, time *switches, ripple control receivers, data communication interfaces, etc. are enclosed in the meter case *(multi-function meters) then this standard applies only for the active energy metering part. *This standard distinguishes between: *. electromechanical and static meters; *. meters of class indexes A, B and C; *. direct connected and transformer operated meters; *. protective class I and protective class II meters; *. meters intended to be used indoors and outdoors. *It does not apply to: *. watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line *voltage for meters for polyphase systems); *. portable meters; *. reference meters. *For rack-mounted meters, the mechanical properties are not covered in this standard. *The test levels are regarded as minimum values to guarantee the proper functioning of the meter *under normal working conditions. For special applications, other test levels might be necessary and *should be agreed on between the user and the manufacturer.