IS 15884 : 2024 Alternating Current Direct Connected Static Prepayment Meters for Active Energy (Class 1 and Class 2) - Specification
1 SCOPE
This standard applies to direct connected static watt hour prepayment meters of accuracy Class 1 and Class 2, for the measurement, registration and dispensation of alternating current electrical active energy of 50 Hz for single-phase and three-phase balanced and unbalanced loads in accordance with available credit. It applies to their type, acceptance and routine tests.
It applies to static watt-hour prepayment meters consisting of a measuring element and register(s) enclosed together in a meter case. It also applies to operation indicator(s) and test output(s). This standard also applies for additional prepayment functional element(s) which may include user/token interface credit transfer, credit accounting, load switch and time keeping in the same case.
The standard does not apply to the prepayment functionality processed outside the meter. In such case, prepayment functionality shall be part of HES validation.
NOTE - The standard covers utilization categories of switches in the meter as UC1 for Imax up to 100A and UC2 and UC3 categories of switches based on the installation conditions, short circuit current and other test requirements given in Annex G.
It applies to indoor applications only.
It does not apply to:
a) Watt-hour meters where the voltage across the connection terminals exceeds 600 V (line - to - line voltage for meters of poly phase systems);
b) Watt-hour meters for outdoor applications;
c) Meters with an external switch;
d) Meters for supply/load control switch applications;
e) Multi-part payment meter installation;
f) Outdoor meters (see IS 13779 for definition of outdoor meters); and
g) The standard does not apply to the prepayment functionality processed outside the meter. In such case, prepaymen functionality shall be part vending system validation.
The long-term reliability aspect is not covered in this standard, as there are no short-term test procedures available yet, which would fit into type test documents to satisfactorily check this requirement.
This standard does not cover the software requirement for prepayment meters.
2 REFERENCES
The standards listed in Annex M contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of these standards.