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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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.