PaulSC
Senior Member
- Joined
- Sep 23, 2010
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Evening all,
Just been to look at a CU change job today and took a quick Zs reading on a number of socket outlets (only one ring final circuit). On a few of the sockets, I got a reading slightly above (1.6 ohms) the maximum recommended in the OSG for what will be 60898 MCB's. Am I right in thinking as this is to be a 17th edition board change (dual RCD) then anything below 1667 ohms is still acceptable, though not ideal.
Customer wants all new accessories, so these readings may well come down, especially in the kitchen where years of fat, steam and crud may have increased the resistance of the socket (readings taken at the front of sockets with 3 pin adaptor for Megger).
Thanks
Paul
Just been to look at a CU change job today and took a quick Zs reading on a number of socket outlets (only one ring final circuit). On a few of the sockets, I got a reading slightly above (1.6 ohms) the maximum recommended in the OSG for what will be 60898 MCB's. Am I right in thinking as this is to be a 17th edition board change (dual RCD) then anything below 1667 ohms is still acceptable, though not ideal.
Customer wants all new accessories, so these readings may well come down, especially in the kitchen where years of fat, steam and crud may have increased the resistance of the socket (readings taken at the front of sockets with 3 pin adaptor for Megger).
Thanks
Paul