The protective conductor system

Article no. P1377400 | Type: Experiments

10 Minutes
10 Minutes
grades 7-10


Faulty insulation can result in voltages on parts of appliances that are not intended to carry current.
Dangerous voltages occur most frequently on metal casings of electrical appliances. To exclude the possibility of danger to people using such appliances, a safety lead is installed that is connected to the N-lead of the household electric circuit. A short circuit then results when, for example, there is a voltage on the metal casing of an appliance. The safety fuse is triggered.


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  • Corrosion-free gold plated contacts
  • Doubled earning sucess: Electric circuit diagram on top, real components can be seen unterside


How is it possible to prevent dangerous voltages from occurring on conductive casings of electrical appliances?

Set up an electric circuit with a safety fuse, switch, filament lamp and casing. Use the person model to examine the function of a safety lead.


File name
File size
File type
(en) Experiment guide
p1377400e .pdf
File size 0.37 Mb
(de) Versuchsbeschreibung
p1377400_de .pdf
File size 1.21 Mb
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