01-12-2015, 08:30 PM
That's what I reckon too, anyways, went over to my mates sawmill today to help set up a jig for making some A frames for a special shed order. took the tester with me as he ask if I could test his earth, the sawmill is in the woods by a river, inside and outside is damp, lots of old sawdust, spiders webs everywhere.
There's two supplies, one is 3 phase from his own 100KVA generator, the other is single phase from the DNO, that feeds an open side covered work area and also an old porta-cabin (the office) that's where I plugged in the tester as soon as the test cycle started the RCD tripped out, reset the trip and tried again, same thing happened, the tester I think uses about half the normal RCD trip current so far as I know, I have done several test in the chalet and the house without any tripping, he might have a few ma leakage to earth to start off with and maybe the tester provided the rest.
I looked at the main incomer to the henly type block, L&N in L&N out to the meter, no earth provision at that block so it lookks TT, didn't have time to investigate further but he did say that the earth cable to the rod was secured to the rod with a jubilee clip about 20 years ago and had not been touched since, it's all very damp at the sawmill, might look into it further on another visit.
Lawrence.
There's two supplies, one is 3 phase from his own 100KVA generator, the other is single phase from the DNO, that feeds an open side covered work area and also an old porta-cabin (the office) that's where I plugged in the tester as soon as the test cycle started the RCD tripped out, reset the trip and tried again, same thing happened, the tester I think uses about half the normal RCD trip current so far as I know, I have done several test in the chalet and the house without any tripping, he might have a few ma leakage to earth to start off with and maybe the tester provided the rest.
I looked at the main incomer to the henly type block, L&N in L&N out to the meter, no earth provision at that block so it lookks TT, didn't have time to investigate further but he did say that the earth cable to the rod was secured to the rod with a jubilee clip about 20 years ago and had not been touched since, it's all very damp at the sawmill, might look into it further on another visit.
Lawrence.
