PAT Appliances & Machines Safety Trainer
AD 3
– MI 3399
221
Figure 4-10: Substitute leakage test for Class I device
AC test signal is applied between connected live pins and PE contact of supply cord.
Isolated accessible metal parts are NOT included in this test and are measured as Class
II items.
Figure 4-11: Substitute leakage test for Class II device
AC test signal is applied between connected live pins and accessible isolated metal part.
Examples of faults
Fault:
Decreased insulation between live parts and isolated accessible conductive part
caused by dirt, dust, moisture etc.
Result:
Dangerous contact voltage on accessible conductive part. There is a risk of
electrical shock if this part would be touched.
Fault
: As the insulation in appliance between live and earthed parts deteriorates the
overall leakage current can increase over the safety leakage limit level.
Result:
Too high leakage currents result in tripping of RCDs. Bad insulation can result in
sparking and local overheating of appliance. This is especially dangerous in case of bad
earthing of the installation.
Содержание MI 3399
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