I've just installed an outside supply using 10mm 3core swa cable supplied by a 32A 30mA RCBO. Trips at around 12ms on 1x (cant remember exact reading), 27mA on ramp and >40ms on 5x which does not comply. The run of the supply cable is about 40-50 metres. I have tried 3 different RCBO's on the circuit and still nothing on 5x test. They work fine when i tested them with the ring main. The outside supply cable insulation resistance was also ok (>299Mohm) and the Zs was ok. Any ideas????