Provides a means for identifying the conductors of 3-phase interconnected systems by the use of hour (clock-face) numbers, taking as a basis the phase sequence, starting from an arbitrary origin, of their applied voltages.
IEC 60152:2021 specifies methods and rules for the designation of phase difference between two items in a three-phase AC system. The designations are intended to be applied in the technical documentation of industrial installations, equipment, and products, and also on markings of equipment and products. IEC 60152:2021 cancels and replaces the first edition published in 1963. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition: a) the title has been updated to reflect the content of the document; b) the concept of identifying conductors with hour number has been removed as the concept is considered out of date and other means for identifying conductors exists; c) definition of hour number (clock number) and phase difference introduced.
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