AC static watthour meters are electric meters used to measure the amount of electrical energy consumption in alternating current (AC) systems. These meters are used by residential and commercial customers to measure their electricity consumption. These meters measure energy in kilowatthours (kWh) consumed over a given period, allowing companies to bill customers accordingly. 

To ensure the product quality of these meters and consumer safety, the Bureau of Indian Standards (BIS) has made it mandatory for manufacturers to undergo BIS registration and obtain the BIS ISI mark before selling their products in the market. Manufacturers can use the ISI Mark on their products only after obtaining a license from BIS that is granted after BIS registration. The presence of the ISI mark on a product indicates that it complies with BIS's stringent quality standards.

IS 13779:1999 specifies the general requirements and tests for various ac static watt-hour meters of classes 1 and 2,which are generally equivalent to induction meters. The Bureau of Indian Standards adopted this 'Indian Standard' after the Electro technical Division Council approved the draft finalized by the Equipment for Electrical Measurement and Load Control Sectional Committee. This standard specifies static watt-hour meters of accuracy classes 1 and 2 for measuring alternating-current electrical active energy at frequencies ranging from 45 Hz to 55 Hz for single-phase, three-phase, balanced, and unbalanced loads.

It only applies to static watthour meters consisting of measuring element and register enclosed in a meter case. It is also applicable to the operation indicator and the test output. It also applies to meters with multirate tariffs and meters that measure energy in both directions.

REQUIREMENTS FOR AC STATIC WATT-HOUR METERS

1.      Meters are classified as Class 1 and Class 2. Meters must be designed and built in such a way that they do not introduce any danger in normal use and under normal conditions in order to ensure personal protection from electric shock, personal protection against the effects of high temperatures, protection against the spread of fire, as well as against solid objects, dust, and water.

2.      Marking shall be done as per the standard requirements, and every meter shall bear the information specified in the standard. 

TEST REQUIREMENTS OF IS 13779:1999

The following test shall be carried out for ac static watthour meters.

·       General and Constructional Requirements

·       A.C. High Voltage Test

·       Insulation Test

·       Accuracy Requirements (Limits of Error)

·       Test of starting condition

·       Test of no-load condition

·       Power Consumption

To learn about the test equipment in detail, please refer to the BIS official product manual. 

Product Manual link: https://law.resource.org/pub/in/bis/S05/is.13779.1999.pdf

Process for BIS ISI Mark Certification 

To know the process in detail, please visit:

• ISI Mark Certification for Domestic Manufactures

• ISI Mark Certification for Foreign Manufactures

Under BIS Registration Products ISI and CRS

·       BIS CRS Registration For IT Products List

·       ISI Mark Registration For ISI Products List

CONCLUSION

AC static watt-hour meters have been included in the mandatory ISI Certification Scheme under the IS 13779:1999 standard. This product cannot be exported, imported, or sold in the Indian consumer market without the ISI Mark imprinted.

If you need any assistance with BIS ISI registration for AC static watt-hour meters or ISI mark certification for AC static watt-hour meters, you can reach out to Evtlindia. We provide assistance with all documentation formalities with India's BIS office, ensuring a smooth and hassle-free registration experience, and guiding you through the entire process from start to finish.

You can contact us via email at contact@evtlindia.com or by phone at 9560935898. Feel free to get in touch with us anytime for the support you need.