I.S. EN 60521:1995
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
CLASS 0.5, 1 AND 2 ALTERNATING-CURRENT WATTHOUR METERS
Hardcopy , PDF
05-21-2003
English
01-01-1995
For Harmonized Standards, check the EU site to confirm that the Standard is cited in the Official Journal.
Only cited Standards give presumption of conformance to New Approach Directives/Regulations.
Explanatory foreword in relation to Class 0.5 meters
Clause
1. Scope
2. Units
3. Definitions
4. Classification
5. Mechanical requirements
6. Electrical requirements
7. Marking of Meters
8. Accuracy
9. Starting and running with no-load
10. Adjustment
APPENDIX A - Graphical symbols for watthour meters
Annex ZA (normative) Other international publications
quoted in this standard with the
relevant publications
Annex ZB (normative) Special national conditions
TABLES
I. Clearances and creepage distances
II. Standard basic currents
III. Standard reference voltages
IV. Power loss
V. Apparent power loss
VI. Heating
VII. A.C. Voltage tests
VIII. Voltage marking
IX. Voltage and current balance
X. Reference conditions
XI. Percentage error limits (single-phase meters and
polyphase meters balanced loads)
XII. Percentage error limits (polyphase meters carrying
a single-phase load, but with balanced polyphase
voltages applied to voltage circuits)
XIII. Interpretation of test results
XIV. Temperature coefficient
XV. Influence quantities
XVI. Variations due to short-time overcurrents
XVII. Variations due to self-heating
XVIII. Starting currents
XIX. Minimum range of adjustment
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