4
Variations the threshold perception within the frequency range 50/60 1000 Hz. (E. All points one zone represent
values currents and values time that have similar effects the human body.1 (for
alternating currents) and 4.2 (for direct currents).EFFECTS CURRENT PASSING THROUGH THE HUMAN BODY
24
Besides these aspects, the hazard depends the weight persons and the pathway of
the current through the body. These zones
are described bellow the figures.1.g.
Figure 4. values).
.1. Any point any zone represents one value current and one value of
time for which the current passes through the human body.1.
[Reference document: IEC Publication 479-2 (1987)]
Note Frequency factor Ft: Ratio the threshold current for the relevant physiological effects
at the frequency threshold current 50/60 Hz.m. the current 200 passing from one hand the other one
has the same effect the current passing from the left hand feet.
Note The frequency factor differs for perception, let-go and ventricular fibrillation.s.
Note Threshold perception and frequencies between kHz and 100 kHz:
For frequencies between kHz and 100 kHz the threshold rises approximately from mA
to 100 (r. Zones effects the human body are
shown these figures.
Relationships the currents causing different effects the human body the time for
which the currents are passing through the human body are shown Figures 4.)
These relationships are shown the following figures
