broken ring .

[homeboy]

broken ring , no continuity on all conductors , whats best way to find the fault?

 

[Guest111]

Split the ring at the midpoint and then check each way,when you find which leg is faulty just keep splitting and test between each socket till you find it.

 

[Pete999]

Isolate and lock off
Disconnect all rfc conductors at the CU
locate the sso nearest to the center of the rfc and disconnect all conductors
You now have 2 legs of the rfc separated
Through a process of elimination test for continuity of both legs until you get an open circuit
Carry out this procedure until you eventually find the open point
Simples
Pete999

 

[homeboy]

thanks guys .

 

[Richard Burns]

Since you have no continuity on all conductors it is likely the ring is disconnected at a single point (though it could be three different points).
Take all the conductors out of the board, join incoming line and incoming cpc (or outgoing line and outgoing cpc), then go round the sockets testing continuity between line and cpc.
At the point where you stop getting continuity (or start getting continuity) the fault is either at that socket or the one before of the one after, take the plates off and find the disconnection.

 

[HandySparks]

Since you have no connectivity on any of the conductors, try to work out whether the circuit really is supposed to be a ring or whether it's just a radial branched at the origin. What's the conductor size, and the fuse or breaker rating?

Identify which sockets are served by that circuit by powering on one circuit at a time and checking what's live. No point testing sockets that are on another circuit.

Assuming two cables into one fuse or breaker, disconnect the circuit from the supply. At the origin, connect any two cores of one cable together, say line and CPC. Work outwards from the origin, measuring the resistance between the two selected conductors. Disconnect the cores and repeat for the other cable. Of course, you may have to inspect some of the socket wiring for evidence of spurs and perhaps disconnect some sections and test separately. This should give you a picture of what's connected to each cable and how far from the origin each socket (or other load point) is.

If you're satisfied that you know the layout of the circuit, re-connect the ends to form a ring and re-test to the regs or replace the fuse or circuit breaker with one suitable for the existing circuit arrangement.


Edit: I see, Richard, that we are thinking along the same lines.

 

[Guitarist]

Or, it may be quicker to hire an electrician who has experience in fault-finding.

 

[FAA Greenie]

What rating of CB is protecting the circuit?

Do you know what size of cable makes up the circuit(s)?

Above all, and don't take this the wrong way, what quals/experience do you have?