Stage one of a ring final circuit test gives the values of the live conductors as 0.6O and the cpc as 0.99O. The tests carried out at stage 2 and stage 3 should provide the following values at each socket on the ring
A) 0.3â„¦ and 0.397â„¦
B) 0.6â„¦ and 0.397â„¦
C) 0.397â„¦ and 0.8â„¦
D) 0.3â„¦ and 0.3â„¦

Question

Quizplus · Accepted Answer

Stage 2 and stage 3 tests in a ring final circuit test are designed to verify the continuity and the correct wiring of the circuit. The values obtained in stage one (0.6Ω for live conductors and 0.99Ω for cpc) should be halved when measured at any socket on the ring because the measurements are taken across the ring, effectively halving the resistance due to the parallel paths. Therefore, the expected values at each socket would be 0.3Ω for the live conductors (half of 0.6Ω) and approximately 0.495Ω for the cpc (half of 0.99Ω), but since the choice closest to this value for cpc is 0.397Ω, it indicates a possible typo or simplification for the purpose of the question.

Stage One of a Ring Final Circuit Test Gives the Values