1.1.
Figure 4. Principles
There difference between the hazard associated with direct (d.4).1.c.) and that with
alternating current (a.c.c. EFFECTS CURRENT PASSING THROUGH THE HUMAN BODY
4. currents (15 100 Hz) persons Description zones:
.
Zone
designation
Zone limits Physiological effects
AC 0,5 mA
a
Usually reaction
AC Usually harmful physiological effects
AC Usually organic damage expected
AC above Dangerous pathophysiological effects: cardiac arrest, breathing
arrest and severe burns
AC 4.c.1
Time/current zones effect a. regards a.1.EFFECTS CURRENT PASSING THROUGH THE HUMAN BODY 21
4.c.c.): a.3 above Probability ventricular fibrillation above %
1) For duration current-flow below ms, the limit for the body current for line remains
constant value 200 mA.1 Probability ventricular fibrillation about %
AC 4. more dangerous than d.2 Probability ventricular fibrillation about %
AC 4., the level danger
varies depending the frequency: low and high frequencies are less dangerous than the
technically applied frequencies and (see Figures 4.1 4
