電箱基本知識，拉電線，點穿環形線路？

How to Test a Ring Final Circuit - Ring Main or Socket Circuit - Ring Continuity & Polarity Tests SparkSafe In this video me and Marcus look at dead test number 2 in BS7671. In the test sequence this is "testing continuity of ring final circuit conductors, including protective conductors". We go through all 3 stages recording the results and we show the calculation for R1 RN and R1 R2 from r1, rn and r2 end to end readings. We prove the circuit is wired as a ring final circuit sometimes called a