L
Lambretta phil
R c d tripping in main c/ unit in house think intermittent fault on cable to garage.disconected at both ends my steinel testers show fault between all conductors.my mates fluke and insulation testers show clear ,i test with mine again and fault . So when I go to get new cable I buy new fluke testers and with these ,yes you guessed it I get a fault. What am I missing.