BIS CERTIFICATION FOR AC STATIC TRANSFORMER OPERATED WATTHOUR METERS & VAR-HOUR METERS
IS 14697:2021

This standard specifies static watthour meters with accuracy classes 0.2 S, 0.5 S, and 1 S, as well as var-hour meters with accuracy classes of 0.2 S, 0.5 S, and 1 S, for measuring alternating current electrical active and reactive energy at frequencies ranging from 45 Hz to 55 Hz for single-phase and three-phase balanced and unbalanced loads.

It only applies to transformer-operated static watthour meters with measuring element(s) and register(s) enclosed in the meter case. It is also applicable to the operation indicator(s) and the test output (s). It also applies to meters with multiple rate tariffs and meters that measure energy in both directions.

Some static reactive energy (var-hour) meters may be considered to be covered by this standard as if they were active energy (Watthour) meters of appropriate accuracy class with necessary power factor adjustment. It is preferable to have the same accuracy class for active and reactive energies in a meter; however, this standard allows the reactive energy accuracy class to be one level lower than the active energy accuracy class.

This does not apply to the following:

• Watthour and var-hour meters where the voltage across the connection terminal exceeds 600 V (line to line voltage for meters in polyphase systems)
• Portable and outdoor meters
• Data interfaces to the meter register.
• The mechanical requirements for rack-mounted meters are not covered by this standard.

Meters are classified based on their respective class indices, such as 0.2 S or 0.5 S.

Meters must be designed and built in such a way that they do not introduce any danger in normal use and under normal conditions, ensuring personal safety against electric shock, excessive heat, and fire. The meter must have a case that can be sealed so that the internal parts of the meter can only be accessed after breaking the seal.

TESTS

All the tests shall be carried out in accordance with the standard.

1. General and Constructional Requirements
2. a.c. High Voltage Test
3. Insulation Test
4. Accuracy Requirements (Limits of Error)
5. Test of starting condition
6. Test of no-load condition
7. Power Consumption

marking

Marking shall be done as per the requirements of IS 14697:2021. Ac static watthour meter can also be marked with a standard mark (ISI Mark). Manufacturers must obtain a BIS license from the Bureau of Indian Standards to use a standard mark (ISI Mark). The Bureau grants a license based on a successful assessment of manufacturing infrastructure, production process, and testing capabilities during a visit to its manufacturing premises.

NOTE:

For Detailed Information about the Procedure for BIS ISI Certification, Visit :

1. Procedure for Domestic Manufacturer
2. Procedure for Foreign Manufacturer

Conclusion:

If a product falls under the scope of the BIS Conformity Assessment Scheme, All the manufacturers, importers, and foreign entities must obtain BIS ISI Certification. The Bureau may cancel the License if the product fails to meet certification requirements.

Aleph INDIA has been serving the industry as a single-window operator for all product regulatory compliance. We can assist importers or manufacturers in meeting all criteria for importing or selling a product in the Indian market.