BS 8431:2010

This British Standard is based on BS EN 61036 (now superseded by BS EN 62052 and BS EN 62053) and applies to all electrical energy meters for general industrial and commercial applications (such as energy management, compliance with aspects of building regulations, etc.). BS 8431 does not apply to meters within the scope of BS EN 62052 and BS EN 62053. Those standards are specifically written to specify the requirements of utility metering while this specification applies to sub-meters for general commercial and industrial applications.

This British Standard 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 meters 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 standard.

NOTE1 Primary meters are covered by BSEN62052 and BSEN62053.

NOTE2 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 standard 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 standard applies only to the section of the meter concerned with measurement.

NOTE3 Tests are included in this Standard in the following annexes:

• AnnexA, Tests of mechanical requirements;

• AnnexB, Tests of climatic influences;

• AnnexC, Tests of electrical requirements;

• AnnexD, Tests for electromagnetic compatibility (EMC);

• AnnexE, Tests of accuracy requirements;

• AnnexF, Tests of safety requirements.

AnnexG contains a recommended test schedule.