Sets out general rules for protection of live conductors against overload and short circuit.Specifies the features of various protective devices and necessary coordination between conductors and overload protective devices. Formula for calculation of time in which a given short-circuit current will raise a conductor from the highest admissible temperature in normal duty to its limit temperature. Enumerates requirements for coordination of overload and short-circuit protection.Note: For details of -low-voltage circuit breakers, see IEC 60947-2-low-voltage fuses, see IEC 60269-for coordination of low-voltage direct-online (full voltage) motor starters with short-circuit protective devices, see IEC 60947-1-for current-carrying capacities of conductors for electrical installations of buildings, see IEC 60364-5-523.
Describes how live conductors are protected by one or more devices for automatic interruption of the supply in the event of overload (see clause 433) and short-circuits (see clause 434) except in cases where the overcurrent is limited in accordance with clause 436 or by the conditions described in 433.4, 443.5 or 443.3 are met. Further, protection against overload and against short-circuits shall be co-ordinated in accordance with clause 436. The contents of the corrigendum of August 2002 have been included in this copy.
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