Went to visit a friend today. He has an oil filled electric towel-rail in the bathroom, 700W @ 230v. It's practically brand new and worked fine when [ professionally ] installed, but he's been away in England for several weeks. The whole house has been professionally rewired right back to new consumer unit / panels. When plugged in it runs for 30 seconds, then trips the 30ma RCD unit. I put a meter on the plug [ cord-cap ] terminals and got a reading of about 9000 ohms hot to ground, ie a leakage of about 20ma with the unit cold. I told him to get the electrician back in to fix the problem as he has a serious fault, but why does it trip out after 30 seconds?
[This message has been edited by Alan Belson (edited 12-15-2006).]
Could there possibly be enough inductive reactance to reduce the AC current to borderline? I really question the mfg. tolerances on GFCIs. I faulted hot to ground through my Fluke and a variable resistor on a GFCI at work. It didn't trip until about 9mA, which was more than I expected. I had tested one this way in response to a thread here where someone had suggested using a Wiggy to test a GFCI. I seem to remember the Wiggy flowing a current several times that considered lethal. Joe