IEC 60521 : 2.0被替代
CLASS 0.5, 1 AND 2 ALTERNATING CURRENT WATTHOUR METERS
出版：International Electrotechnical Committee
專家解讀視頻
Applies only to newly manufactured type watthour meters of accuracy classes 0.5, 1 and 2, for the measurement of alternating current electrical active energy of a frequency in the range 45Hz to 65Hz and to their type tests only.
CEI 13-17 : 1987 COR 1995 - Identical
UNE 21310-2 : 1990 - Identical
CEI EN 60521 : 2ED 1997 - Identical
I.S. EN 60521:1995 - Identical
SAC GB/T 15283 : 1994 - Identical
BS EN 60521 : 1995 - Identical
DIN EN 60521 : 1995 - Identical
HD 309.1 : 200S1 - Similar to
NEN 10521 : 1995 - Identical
CEI 13-13 : 1982 COR 1982 - Identical
