METREL MI 3399, Инструкция с упражнениями

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PAT Appliances & Machines Safety Trainer AD 3
– MI 3399
227
Figure 4-20: Example of excessive touch leakage
Measuring principle / limits:
Measurement on a class II appliance (same procedure is used for isolated accessible
conductive parts on class I appliances).
Figure 4-21: Example of excessive touch leakage
Notes:

Each isolated accessible conductive part must be checked separately. The highest
results must be considered.

This is an alternative measurement if insulation and subleakage tests are
questionable.

This is often the only applicable leakage measurement if supply is not allowed to
be interrupted.

If touch leakage currents differ for different appliance operating modes all modes
must be checked. The highest result must be considered!

If the position of line and neutral conductor in the installation or appliance plug is
not predefined, the test must be performed in both directions with higher result
considered.

The measuring instrument must be well grounded during the test.