NF EN 60687 : 1993

Cooperating organizations
National foreword
Foreword
1. Scope
2. Normative references
3. Definitions
3.1 General definitions
3.2 Definitions related to the functional elements
3.3 Definitions of mechanical elements
3.4 Definitions of insulations
3.5 Definitions of meter quantities
3.6 Definitions of influence quantities
3.7 Definition of tests
4. Requirements
4.1 Standard electrical values
4.2 Mechanical requirements
4.3 Climatic conditions
4.4 Electrical requirements
4.5 Electromagnetic compatibility (EMC)
4.6 Accuracy requirements
5. Tests and test conditions
5.1 General testing procedures
5.2 Tests of mechanical requirements
5.3 Tests of climatic influences
5.4 Tests of electrical requirements
5.5 Tests for electromagnetic compatibility (EMC)
5.6 Tests of accuracy requirements
Annexes
A. Relationship between ambient air temperature and
     relative humidity
B. Voltage wave-form for the tests of the effect of
     voltage dips and short interruptions
C. Electromagnet for testing the influence of
     externally-produced magnetic fields
D. Test schedule
ZA. Special national conditions
ZB. Other international publications quoted in this
     standard with the references of the relevant
     European publications
Tables
1. Standard reference voltages
2. Clearances and creepage distances for the terminal
     block
3. Voltage marking
4. Temperature range
5. Relative humidity
6. Power consumption including the power supply
7. Voltage range
8. Variations due to self-heating
9. Percentage error limits (single-phase meters and
     polyphase meters with balanced loads)
10. Percentage error limits (polyphase meters carrying
     a single-phase load, but with balanced polyphase
     voltages applied to voltage circuits)
11. Influence quantities
12. Temperature coefficient
13. AC voltage tests
14. Voltage and current balance
15. Reference conditions
16. Interpretation of test results
National annex NA (informative) Committees responsible
National annex NB (informative) Cross-references

Deals with the measurement (by static watt hour meters of accuracy classes 0,2 S and 0,5 S) of alternating current electrical active energy of a frequency between 45Hz to 65 Hz and to their type tests only. Applies transformer operated static meters for indoor application consisting of one or more measuring elements and registers enclosed together in the same case. Also applies to test outputs, operation indicators and meters that measure energy in both directions. Does not apply to: portable meters and meters for outdoor use; watt hour meters where the voltage across the connection terminals exceeds 600 V (line to line voltage for meters for polyphase systems); data interface to the register of the meter; reference meters.