Hi guys, Keep having problems testing 6A Proteus type B MCB's on lighting circuits. Using a Megger MFT1502 on 'no-trip' Earth loop setting, and using the 2 & 3 wire methods, either the MCB trips, or the meter trips... only seem to have this problem with proteus MCB'S... any one else have the same problem using a Megger & Proteus together? a mate came round with his MFT1502/2 and we both got the same results. I have disconnected the load from the breaker and tested the MCB by it's self and it still trips out... had this in two properties now! all OK on 16A and above MCB's How much current does a Megger MFT deliver on the 'no-trip' loop test ??? Any thoughts ?