LOL!
![[Linked Image]](https://www.electrical-contractor.net/ubb/smile.gif)
So it works just fine until it's switched on!
![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif)
Re the 50V limit, this is another case where changes to the rules over the years have not necessarily tightened the requirements as one might expect.
Allow me to quote from the 1966 IEE Regulations (14th Edition):
D.24 A current-operated earth-leakage circuit-breaker shall be used only where the product of its operating current in amperes and the earth-loop impedance in ohms does not exceed 40. Where such a circuit-breaker is used, the consumer's earthing terminal shall be connected to a suitable earth electrode.
The trip currents have become much lower, however:
NOTE:- It is desirable in general that the operating current of a current-operated earth-leakage circuit-breaker should not exceed 2% of the normal rated current of the circuit. Operating currents less than 500mA are not normally necessary unless the value of earth-loop impedance is such that a lower oeprating current is essential for compliance with rule D.24.
