As part of the standards for BS 7671 it states:

A device which disconnects the charging point from the live conductors of the supply and from protective earth in accordance with Regulation 543.3.3.101(ii) within 5 s in the event of the voltage between the circuit protective conductor and Earth exceeding 70 V rms. The device shall not operate if the voltage exceeds 70 V rms for less than 4 s. The device shall provide isolation. Closing or resetting of the device shall be by manual means only. Equivalent functionality could be included within the charging equipment.

I have a device which needs testing and falls under this category. Therefore, I am wondering how to replicate this fault condition safely. Presently I'am thinking of using a SPDT switch that when toggled connects a line connection(One of the phases) to the neutral via a resistor.

I am not sure however, what size the resistor should be to make it 70Vrms or if this is the correct method. Note the input power is 3 Phase AC 230Vrms.



Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Browse other questions tagged or ask your own question.