just a quick note, just finished my am2, hopefuly passed, however i was in a room of people that all got one of the faults wrong on the fault finding, aswell as the normal short circuit, open circuit, and heating system faults, we got a high resistance joint on the neutral mfeeding the spur off the ring. it was up at 10ohms, which most people overlooked due to not having their multimeter on the right setting, and just listening for the tone to conferm continuity.