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In this competitive scenario, it isn't easy to survive in the market without a standard quality and certified product. BIS license may also be required to sell products in the Indian market.

To get BIS certification and produce a standard quality product, the manufacturer must ensure that their product must follow the specified Indian standard.

Let's take a closer look at IS 14697:2021 for a.c. static transformer operated watthour meters (class 0.2 s and 0.5 s) and var-hour meters (class 0.2 s, 0.5 s and 1 s).

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.