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The requirements for the test and inspection of a ring main have to confirm that it is infact an intact ring, ie each conductor leaves the board and returns which is a simple test and is done by placing each conductor in series with the other conductors so start with Live and Live return connect to Neutral, the neutral return you connect to the CPC and CPC return is the other end of the loop, now if there is no continuity then one of those conductors is open.You also have to confirm that the ring has not been bridged, ie a ring within a ring and this is where you only loop the Live & Neutral so you have all the live side impedances in parallel with the neutral impedances and then at every socket the impedance between live and neutral should be the same, if not then something is wrong. You are not just disconnecting one side, you have a total of six wires each should be a loop and not a radial.The ones we used were for Dc current measurement, the PR30 and also some larger ones for just Ac and they were like hoover is to a vacuum when it came to current measurement but now they are nolonger grey but Fluke yellow with a price hike to match .For electricians it was a routine test, you just did it with a continuity tester and a good low ohm meter, preferably a four wire job which I still have somewhere.
The requirements for the test and inspection of a ring main have to confirm that it is infact an intact ring, ie each conductor leaves the board and returns which is a simple test and is done by placing each conductor in series with the other conductors so start with Live and Live return connect to Neutral, the neutral return you connect to the CPC and CPC return is the other end of the loop, now if there is no continuity then one of those conductors is open.
You also have to confirm that the ring has not been bridged, ie a ring within a ring and this is where you only loop the Live & Neutral so you have all the live side impedances in parallel with the neutral impedances and then at every socket the impedance between live and neutral should be the same, if not then something is wrong. You are not just disconnecting one side, you have a total of six wires each should be a loop and not a radial.
The ones we used were for Dc current measurement, the PR30 and also some larger ones for just Ac and they were like hoover is to a vacuum when it came to current measurement but now they are nolonger grey but Fluke yellow with a price hike to match .
For electricians it was a routine test, you just did it with a continuity tester and a good low ohm meter, preferably a four wire job which I still have somewhere.
