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IEC 60152 Ed. 2.0 b:2021

Designation of phase differences by hour numbers in three-phase AC systems
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IEC 60152 Ed. 2.0 b:2021

Designation of phase differences by hour numbers in three-phase AC systems

PUBLISH DATE 2021
PAGES 18
IEC 60152 Ed. 2.0 b:2021

Designation of phase differences by hour numbers in three-phase AC systems is a method used to describe the relative phase positions of the voltages or currents.

In this system, the phase difference between any two phases is represented as an angle on a clock face, with one hour corresponding to 30 degrees.

This approach provides a clear and intuitive means of communicating phase relationships, especially in complex wiring and analysis tasks.

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  • b) the concept of identifying conductors with hour number has been removed as the concept is considered out of date and other means for identifying conductors exists;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.
SDO IEC: International Electrotechnical Commission
Document Number IEC 60152
Publication Date July 1, 2021
Language b - English & French
Page Count
Revision Level 2.0
Supercedes
Committee 3
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