How is the limit value selected for the protective conductor test?

In the standard VDE0113 / EN60204 there is a table with cable lengths depending on rated current, cable cross section and characteristics of the overcurrent protection element. If these cable lengths are not exceeded, a loop impedance measurement on the fully installed machine will not exceed the required limit value.

In Profitest 204, these line lengths were converted into ohmic resistances. This makes it possible to check the machine in advance without it already being connected at the final installation site.

The setting depends on the type of overcurrent protection element and the cross-section of the outer conductor. Cross-section of the outer conductor, cross-section of the protective conductor and rated current have a fixed assignment: