What should the resistance be between the casing and a copper water pipe or other pipe that goes to ground?
The other thing that came to my attention, is that there is no bonding to any of the copper pipes/sink unit.
RSD, December 2008
If your talking 240volt mains 'live' as opposed to some unusual static build up - you have one very dangerous machine there! You say you've done an earth continuity test -if the earth connection is good and complete to ground - then if the casing becomes live for even a fraction of a second it should be blowing a fuse and/or tripping out a circuit. If it isn't then either it isn't mains voltage or your earth circuit is not complete. Can I suggest you measure the resistance between the casing and a copper water pipe or other pipe that you KNOW goes to ground. (I have copper water pipes but they are fed by a plastic mains pipe!)
I am worried that your earth connection may NOT be going to ground and so giving you no protection at all. People get killed in these circumstances. Take great care!
