2.1 Metering Philosophy -Central Electricity Authority (Installation and
Operation of Meters) Regulations, 2006. Notified vide date 17th March 2006)
2.1.1 Types of Meters (Clause 4)
a) Interface Meter: Interface Meter means a Meter, connected at the point of interconnection with
inter-State Transmission system (ISTS) for the purpose of electricity accounting and billing. Meter
shall be owned by CTU.
b) Consumer meter: Consumer Meter means a Meter used for accounting and billing of electricity
supplied to the consumer. Meter shall be owned by licensee.
c) Energy accounting meter: Energy Accounting and Audit Meter means Meter used for
accounting of electricity to various segments of electrical system. Meter shall be owned by
Generating Company or licensee
All interface meters, consumer meters and energy accounting and audit meter shall be of static
type.
Note: Our focus is on SEMs which are interface meters.
2.1.2 Meter Standards (Clause 5)
All interface meters, consumer meters and energy accounting and audit meters shall –
(a) Comply with the relevant standards of Bureau of Indian Standards (BIS). If BIS Standards are
not available for a particular equipment or material, the relevant British Standards (BS),
International Electro-technical Commission (IEC) Standards, or any other equivalent Standard shall
be followed:
Provided that whenever an international Standard or IEC Standard is followed, necessary
corrections or modifications shall be made for nominal system frequency, nominal system voltage,
ambient temperature, humidity and other conditions prevailing in India before actual adoption of the
said Standard;
(b) Conform to the standards on ‘Installation and Operation of Meters’ as specified in Schedule
annexed to these regulations and as amended from time to time.
2.1.3 Accuracy Class of Meters (Clause 8)
Every meter shall meet the following requirements of accuracy class as specified in the standards.