| Standardization field | Electrical engineering | 
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| Technical committee | BAS/TC 10- Electrical energy measurement equipment and load control | 
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| Term (EN) | class index | 
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| Definition (EN) | a designation that identifies:
–	the set of limits of percentage error at reference conditions, additional percentage error due to influence quantities and maximum permissible error at rated operating conditions the meter shall comply with;
–	the set of critical change values caused by long term disturbances the meter shall comply with. | 
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| Term (FR) |  | 
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| Definition (FR) |  | 
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| Term (DE) |  | 
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| Definition (DE) |  | 
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| Term (BS) | Indeks klase | 
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| Definition (BS) | Oznaka koja identifi kuje:
- Skup granica procentualne greške pri referentnim uslovima, dodatne procentualne greške zbog uticajnih
veličina i maksimalno dozvoljena greška pri nominalnim radnim uslovima koje brojilo mora ispuniti;
- Skup kritičnih vrijednosti promjene kod smetnji koje traju duže vrijeme a koje brojilo mora ispuniti. | 
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| Term (HR) |  | 
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| Definition (HR) |  | 
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| Term (SR) |  | 
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| Definition (SR) |  | 
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| Date | 2016-02-25 | 
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| Standards | BAS EN 50470-1:2011 | 
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