OP
Engineer54
I personally can't see how a single 1m rod of any size can give a value that low... To measure your Ra value, the rods earthing conductor is tested in isolation to any other earthing conductors, bonding conductors or CPC's...
Maybe a rod driven into ground that's been soaked with effluent for many years (such as on a farm) may give a lower value, but then the electrode isn't going to last too long at all, unless it's made of a high grade Stainless Steel... lol!!
I wonder how many electricians just lately have been thinking that they've done well with values they have obtained, mainly due to driving a rod into water sodden soil?? Perhaps they all ought to go back and check again after a dry period!! The truth is, if they have only driven in a single rod, the chances are that the TT system they were so proud of, has risen in value by many ten's of Ohms and in all probably is'nt even stable....
Maybe a rod driven into ground that's been soaked with effluent for many years (such as on a farm) may give a lower value, but then the electrode isn't going to last too long at all, unless it's made of a high grade Stainless Steel... lol!!
I wonder how many electricians just lately have been thinking that they've done well with values they have obtained, mainly due to driving a rod into water sodden soil?? Perhaps they all ought to go back and check again after a dry period!! The truth is, if they have only driven in a single rod, the chances are that the TT system they were so proud of, has risen in value by many ten's of Ohms and in all probably is'nt even stable....