EN 50470-1:2006

1 Scope
2 Normative references
3 Terms and definitions
  3.1 General definitions
  3.2 Definitions related to the functional elements
  3.3 Definitions of mechanical elements
  3.4 Definitions related to insulation
  3.5 Definitions of meter quantities
  3.6 Definitions of influence quantities
  3.7 Definitions of tests
  3.8 Definitions related to electromechanical meters
  3.9 Abbreviations
4 Standard electrical values
  4.1 Standard reference voltages
  4.2 Standard currents and current ranges
  4.3 Standard reference frequency
5 Mechanical requirements and tests
  5.1 General mechanical requirements
  5.2 Case
       5.2.1 Requirements
       5.2.2 Mechanical strength tests of meter case
  5.3 Window
  5.4 Terminals - Terminal block(s) - Protective earth terminal
  5.5 Terminal cover(s)
  5.6 Clearance and creepage distances
  5.7 Insulating encased meter of protective class II
  5.8 Resistance to heat and fire
  5.9 Protection against penetration of dust and water
  5.10 Display of measured values
  5.11 Output device and operation indicator
       5.11.1 General
       5.11.2 Mechanical and electrical characteristics
       5.11.3 Optical characteristics
  5.12 Marking of meter
       5.12.1 Name-plates
       5.12.2 Connection diagrams and terminal marking
  5.13 Accompanying information
6 Climatic conditions
  6.1 Temperature ranges
  6.2 Relative humidity
  6.3 Tests of the effect of the climatic environments
       6.3.1 General
       6.3.2 Dry heat test (Test B)
       6.3.3 Cold test (Test A)
       6.3.4 Damp heat cyclic test (Test Db)
       6.3.5 Protection against solar radiation (Test Sa)
7 Electrical requirements
  7.1 Voltage range
  7.2 Heating
  7.3 Insulation
       7.3.1 Requirements
       7.3.2 General test conditions
       7.3.3 Impulse voltage test
       7.3.4 AC voltage test
  7.4 Electromagnetic compatibility (EMC)
       7.4.1 Electromagnetic environment
       7.4.2 General requirements and test conditions
       7.4.3 Critical change value
       7.4.4 Immunity to voltage dips and short interruptions
       7.4.5 Immunity to electrostatic discharges
       7.4.6 Immunity to radiated RF electromagnetic fields
       7.4.7 Immunity to electrical fast transients/bursts
       7.4.8 Immunity to conducted disturbances, induced by
              RF fields
       7.4.9 Immunity to surges
       7.4.10 Immunity to damped oscillatory waves
       7.4.11 Immunity to continuous magnetic fields of external
              origin
       7.4.12 Immunity to power frequency magnetic fields of
              external origin
       7.4.13 Radio interference suppression
8 Type test
  8.1 Test conditions
Annex A (normative) Relationship between ambient air
        temperature and relative humidity
Annex B (normative) Optical test output
Annex C (normative) Voltage waveform for the tests of the
        effect of voltage dips and short interruptions
Annex D (informative) Test set-up for electromagnetic
        compatibility (EMC) tests
Annex E (normative) Electromagnet for testing the influence of
        continuous magnetic fields of external origin
Annex F (informative) Test schedule - Recommended test sequences
Annex ZZ (informative) Coverage of Essential Requirements
         of EC Directives
Index

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.