A
ac1951
How do check the effectiveness / restistance of an earth rod ?
I read an article on a Wiki web site ...
basically it said to use a low voltage transformer and connect one end
to the earth rod and the other end to your main earth connection in
the CU with an Ampmeter in the cct. Then using simple Ohms law you can
calculate the resistance and this value will prodominantly be the
restistance of the rod to earth.
Fine underatand all that... BUT.. before starting the article said
that you need to disconnect all other bondings (Water and Gas). So
assuming I have no earth provided by the Electrical supplier (hence
the reason for installing your own earth rod) I fail to see how any
current is going to flow in this cct since one end of the supply
simple connects to all the protective earths on the house cables and
the other connects to Ground (via the Rod)
Am I missing something ?
I read an article on a Wiki web site ...
basically it said to use a low voltage transformer and connect one end
to the earth rod and the other end to your main earth connection in
the CU with an Ampmeter in the cct. Then using simple Ohms law you can
calculate the resistance and this value will prodominantly be the
restistance of the rod to earth.
Fine underatand all that... BUT.. before starting the article said
that you need to disconnect all other bondings (Water and Gas). So
assuming I have no earth provided by the Electrical supplier (hence
the reason for installing your own earth rod) I fail to see how any
current is going to flow in this cct since one end of the supply
simple connects to all the protective earths on the house cables and
the other connects to Ground (via the Rod)
Am I missing something ?