I did a periodic inspection on a property yesterday, 3 bed semi, and got a strange result on one of the rings.
When doing the end to end (i call them little r's), r2 was a normal(ish) reading, 1.6 ohms, rn wasn't a ring, and r1 was 20 k ohm, (yes 20,000 ohms), however when i cross connected and did R1 + R2 i got a normal readings all round the ring, highest was 1.01, and that was a spur, all the non spurs were lower than that.
So i investigate and find that one of the sockets has loose connections, retighten them and the r1 comes down to 1.6 ohms and rn is now a ring, 0.9 ohms.
My question is how can r1 be so high yet R1 + R2 be so low, after all i'm still testing the live wire so the resistance is still there, it's just being tested with the earth now as well.
Paul.
When doing the end to end (i call them little r's), r2 was a normal(ish) reading, 1.6 ohms, rn wasn't a ring, and r1 was 20 k ohm, (yes 20,000 ohms), however when i cross connected and did R1 + R2 i got a normal readings all round the ring, highest was 1.01, and that was a spur, all the non spurs were lower than that.
So i investigate and find that one of the sockets has loose connections, retighten them and the r1 comes down to 1.6 ohms and rn is now a ring, 0.9 ohms.
My question is how can r1 be so high yet R1 + R2 be so low, after all i'm still testing the live wire so the resistance is still there, it's just being tested with the earth now as well.
Paul.