The first part of IEC 60479 provides basic guidance on the effects of shock current on human beings and livestock. For a given current path through the human body, the danger to persons depends mainly on the magnitude and duration of the current flow. The relationship between current and voltage is not linear because the impedance of the human body varies with the touch voltage. The values of body impedance depend on a number of factors and, e.g., on current path, on touch voltage, duration of current flow, frequency, degree of moisture of the skin and surface area of contact.
The standard IEC 60479-1: 2018 cancels and replaces the technical specification IEC TS 60479-1:2005, Amendment 1:2016 and IEC TR 60479-3:1998 (incorporated into Annex H).