a customer called me and said one socket does not work, popped down and pushed in kewtech tester, no light, ok it does not work, tested voltages between live&neutral, 240volts, 240 volts between live&earth as well, ok i thought the socket is broken, replaced with a new socket, then pushed in the kewtech tester, still no light at all, this really puzzled me, all the volts are there, how come the socket can not work properly?