Limit touch and step voltages to safe values (typically < 50 V AC in dry conditions, < 25 V AC in wet or medical locations).
The standard does apply to:
outlines several critical design considerations to maintain the integrity of an earthing system: ss 551 code of practice for earthing
applies to earthing systems in alternating current (AC) installations with voltages up to and including 66 kV. It covers: Limit touch and step voltages to safe values
The earth electrode is the physical connection between the electrical system and the general mass of the earth. SS 551 specifies: 50 V AC in dry conditions