What does a failed ring-final continuity test mean?

A ring final circuit is wired as a loop. Sockets on that circuit are fed from both directions when the loop is intact. Continuity testing asks whether each conductor still makes that loop: an open conductor, a poor joint, or a reading that does not match a sound ring will fail the check. The inspector records the result against that circuit, not against the whole installation.

The test is done with the circuit safely isolated and the ends identified. A result that cannot be finished, because a point could not be disconnected or the circuit could not be traced, is a limitation. A limitation is not the same sentence as a measured open circuit.

While the ring is intact, the load is shared around the loop. If one conductor of a ring is open, the remaining path can carry current the ring was arranged to share. Protective devices and cable sizes were chosen on the assumption that the loop exists. An open conductor removes that assumption.

That is why the note is worth investigating. It is not, by itself, a description of which socket, which joint, or which length of cable has failed.

• An open conductor somewhere on the ring.
• A loose joint or a termination that is not continuous.
• A circuit that has been altered so it no longer behaves as a ring, even though it is still labelled as one.
• A reading that does not make sense until the arrangement is drawn out. Do not assume the cable is intact because the sockets still work.
• A limitation, if part of the ring could not be disconnected or identified.

R1+R2 is a different measurement. It is the resistance of the line and circuit protective conductor together, often used to confirm that the earth path is sound. A high R1+R2 note can appear on a ring or on a radial. It is not the continuity failure itself.

A ring can fail continuity and still have a separate earth-path reading, or the other way round. Read the column the inspector filled in. Do not translate one failed figure into the other test.

There is no universal EICR code for the words ring final continuity failed. The classification depends on what was found: an open conductor, an abnormal reading, damage, or a test that could not be finished. C2 means potentially dangerous, with urgent remedial action required. That sentence applies only where the inspector has judged the described condition potentially dangerous.

Investigation, at a high level, identifies the circuit, opens the accessible points, and finds where continuity is lost. Sometimes the break is at a socket or a joint that can be remade. Sometimes the conductor is damaged in a place that is not yet visible. The repair cannot be priced from the heading until the discontinuity has been located, or the report says it has not been located.

A high R1+R2 or poor CPC reading is explained separately under high R1+R2 and CPC continuity. To book the inspection, use EICR testing in London.