This 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 having nominal or rated voltages not exceeding a.c. 1000 V or d.c. 1500 V. It may be used as guidance for higher voltages generated inside EQUIPMENT, but it does not apply to high-voltage distribution systems. 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.