Cancels and replaces the second edition (1984). Specifies time/current zones which are in many cases not directly applicable in practice for designing protection against electrical shock. Indicates values for the electrical impedance of the human body as a function of the current path, on the touch voltage, the duration of the current flow, the frequency, the degree of moisture of the skin and the surface area of contact. Describes the effects of sinusoidal alternating current passing through the human body within the frequency range 15 Hz to 100 Hz and of direct current passing through the human body.