This Draft for Development specifies requirements for newly manufactured electronic secondary meters or
sub-meters which measure either electrical energies alone or electrical energies together with other
electrical parameters associated with the energy. It applies to meters that measure active energy, apparent
energy, reactive energy (capacitive, inductive and/or total), and ampere squared hours (A2h) and to the
measurement of current, voltage, active power, apparent power, reactive power (capacitive, inductive
and/or total), power factor, phase angle and frequency when measured in addition to an energy.
It applies to all secondary and sub-meters for indoor and outdoor applications, both portable and
permanently installed, for all power frequencies including d.c. It also applies to all registers, indicators,
displays and outputs, and to the operation of test outputs.
It does not apply to primary meters, to data interfaces to the meter, or to load survey analysers or load
survey meters. The reliability aspect is not covered in this draft.
NOTE 1 Primary meters are covered by BS EN 62052 and BS EN 62053.
NOTE 2 Load survey analysers are instruments that might measure some or all of the parameters and estimate one or more
energies but do not conform to the requirements of a meter as defined in this draft and other standards.
Where the display and/or the memory is external or where other elements are enclosed in the meter case
(such as maximum demand indicators, telemetering, time switches or remote control, etc.) this draft
applies only to the section of the meter concerned with measurement.