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Ring final practical, step 3: figure of eight, line to CPCWhich ring reading goes on the schedule?

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Same idea, different pair. Take the neutrals out of the cross-connection and join each line to the CPC of the opposite leg. Change the meter setting if it asks you to, then test line to CPC at every socket and outlet again.

  • Expect (r1 + r2) ÷ 4, the same at every point, a little higher on spurs.
  • This is your R1 + R2. Record the highest reading in column 21, the same column as a radial’s method 1 result.
  • With all three steps done, tick polarity for the circuit.
✋Changed the link but not the meter? A tester that steps through ring settings will still be on step 2 until you change it. Open circuit at every socket is usually that, not a fault.
A reading higher than the rest is a finding. At one outlet a reading came in 0.1 Ω above the others; the CPC had worked loose in the terminal. Re-made, it read in line. That’s exactly what checking your readings against each other is for.

Guidance Note 3 · 2.6.6 step 3

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