personal safety

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The following maximum voltages are regarded as not dangerous :

  • 50 V for direct current;
  • 24 V for single phase current;
  • 42 V for three phase current with neutral to earth.

The limit current that can be borne without danger is in the region of 25 mA with alternating current and 50 mA with direct current.

If we take the human body’s resistance as being between 2 000 and 1 000 Ohms.

formula: Personal safety - body’s resistance

whence u = 50 V DC

and U = 25 VAC.