IEC-152 › Identification by hour numbers of the phase conductors of 3-phase electric systems
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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.
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29.020 (Electrical engineering in general Including voltages, general electrical terminology, electrical documentation, electrical tables, safety, fire hazard testing, etc. Electrical diagrams and charts, see 01.100.25 Electrical power stations, see 27.100 Electromagnetic compatibility, see 33.100)
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IEC 60152 Ed. 1.0 b:1963
Jan. 1, 1963