BS 7671 Part 6 / Guidance Note 3 Section 2.7.5

Ring Final Circuit Continuity

Verify ring final circuit test results (r1, rn, r2), expected figure-of-8 reading (R1 + R2), and detect spurs or cross-connections.

End-to-End Line (r1 Ω)

End-to-End Neutral (rn Ω)

End-to-End CPC (r2 Ω)

Expected Figure-of-8 Reading (R1 + R2)

0.40 Ω

r2 / r1 ratio: 1.67 (Matches standard 2.5mm² / 1.5mm² T&E cable)