IEC 62055-31:2005

FOREWORD
INTRODUCTION
1 Scope
2 Normative references
3 Terms and definitions
   3.1 General payment metering definitions
   3.2 Definitions of tokens
   3.3 Definitions of token carriers
   3.4 Definitions relating to tokens and token carriers
   3.5 Definitions related to load switching
   3.6 Definitions related to timekeeping and tariff control
4 Standard electrical values
5 Mechanical requirements
   5.1 General
   5.2 General mechanical requirements
   5.3 Case
   5.4 Window
   5.5 Terminals
   5.6 Terminal covers
   5.7 Creepage and clearance distances
   5.8 Insulating-encased meter of protective class II
   5.9 Resistance to heat and fire
   5.10 Protection against penetration of dust and water
   5.11 Display and indicators
   5.12 Output device
   5.13 Marking of meter
   5.14 Token carrier interface
6 Climatic requirements
   6.1 General
   6.2 Temperature range
7 Electrical requirements
   7.1 General
   7.2 Influence of supply voltage
   7.3 Power consumption
   7.4 Influence of short-time overcurrents
   7.5 Influence of heating
   7.6 Influence of self-heating
   7.7 Insulation
   7.8 Electromagnetic compatibility (EMC)
   7.9 Load switching
   7.10 Auxiliary output switches
   7.11 Token carrier acceptor interface test
8 Metering accuracy requirements
9 Functional requirements
   9.1 General
   9.2 Robustness of meter accounting process
10 Type test
Annex A (informative) Functional performance
   A.1 Basic functionalities - prepayment mode
   A.2 Additional functionalities
   A.3 System compliance requirements
Annex B (informative) Reference model for a payment meter
   B.1 General
   B.2 Generalised payment meter instance
   B.3 Functions in a single-part payment meter
Annex C (normative) Performance requirements for payment
                    meters with load switching utilisation
                    categories UC2, UC3 and UC4
   C.1 Load switching capabilities
   C.2 Normal operation
   C.3 Electrical endurance
   C.4 Line to load voltage surge withstand
   C.5 Fault current making capacity
   C.6 Short-circuit current carrying capacity
   C.7 Minimum switched current
   C.8 Dielectric strength
   C.9 Sequence of tests
Annex D (normative) Requirements of timekeeping
   D.1 General
   D.2 Synchronous clocks
   D.3 Crystal-controlled clocks
   D.4 Tests of timekeeping accuracy
   D.5 Effects of disturbances on timekeeping

IEC 62055-31:2005 applies to newly manufactured, static watt-hour payment meters of accuracy classes 1 and 2 for direct connection, for the measurement of alternating current electrical energy consumption of a frequency in the range 45 Hz to 65 Hz that include a load switch for the purpose of interruption or restoration of the electricity supply to the load in accordance with the current value of the available credit maintained in the payment meter. It does not apply to static watt-hour payment meters where the voltage across the connection terminals exceeds 600 V (line-to-line voltage for meters for polyphase systems). It applies to payment meters for indoor application only, where the payment meter shall be mounted as for normal service Functional requirements that apply to payment meters are also defined and include informative basic functional requirements and tests for the prepayment mode of operation in Annex A. This bilingual version (2013-05) corresponds to the monolingual English version, published in 2005-09.