This International Standard applies to the protection of persons and animals against electric shock. It is intended to give fundamental principles and requirements which are common to electrical installations@ systems and equipment or necessary for their co-ordination.This standard has been prepared for installations@ systems and equipment without a voltage limit.NOTE There are some clauses in this standard which refer to low-voltage and high-voltage systems@ installations and equipment. For the purpose of this standard@ low -voltage is any rated voltage up to and including 1 000 V a.c. or 1 500 V d.c. High voltage is any rated voltage exceeding 1 000 V a.c. or 1 500 V d.c.The requirements of this standard apply only if they are incorporated@ or are referred to@ in the relevant standards. It is not intended to be used as a stand-alone standard.