This International Standard is applicable to high-current testing and measurements on both high-voltage and low-voltage equipment. It deals with steady-state and short-time direct current (as e.g. encountered in high-power d.c. testing), steady-state and short-time alternating current (as e.g. encountered in high-power a.c. testing), and impulse-current. In general, currents above 100 A are considered in this International Standard, although currents less than this can occur in tests.
NOTE This standard also covers fault detection during, for example, lightning impulse testing.
This standard:
defines the terms used;
defines parameters and their tolerances;
describes methods to estimate uncertainties of high-current measurements;
states the requirements which a complete measuring system shall meet;
describes the methods for approving a measuring system and checking its components;
describes the procedure by which the user shall show that a measuring system meets the requirements of this standard, including limits set for uncertainty of measurement.
BSI recommends this version of standard for organisations operating in or with the UK. The ISO edition is available here if required.