Self-monitoring power supply cord and operating equipment

摘要

The invention relates to a power supply cord with at least two conductors N, L for transferring a supply voltage with two protective earths insulated from one another, which at the first end are conductively connected with each other and at the second end there is a measurement device provided for measurement of the resistance of a measuring circuit comprising the PE and measurement conductor P, and wherein in case of exceeding the resistance, a warning signal is output.

主权项

1. Power supply cord (10) with a power plug (12) at its first end, a second plug or coupling (40) at its second end and at least two conductors (N, L) for transferring a supply voltage, a protective earth (PE) and a measurement conductor (P), wherein the conductors (N, L) are connected to connection contacts (13) of the power plug (12) and the protective earth (PE) and the measurement conductor (P) are both connected to a protective earth contact (14) of the power plug (12), and in the second plug or coupling (40) a measuring device (30) is integrated, the measuring device (30) being adapted to measure a resistance over a measuring circuit comprising the protective earth (PE) and the measurement conductor (P) and adapted to output a warning signal in case of an increasing resistance, wherein the protective earth (PE) and the measurement conductor (P) a are connect parallel.