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Student & Learning Zone - City & Guilds
Testing final ring
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<blockquote data-quote="Traineeboy" data-source="post: 500664" data-attributes="member: 32807"><p>If I wanted to obtain the Zs for a ring final circuit that had a spur ( furthest point ) Then from what I under I would take the Ze and add the R1 + R2 readings. Ze is 0.15 and R1 + R2 is 0.15 so the measured Zs would be 0.30. </p><p> </p><p></p><p>However I was told that I could obtain the Zs I wouldn’t have to do the above I would just need to plug my Megger tester in at the furthest socket (in this case it’s a spur so know it’s furthest point ) Put in on Loop Z and L-PE and Select 2 lead Low setting. I did that and got 1.39. </p><p> </p><p></p><p>Those readings a very different it’s convenient fused me as I thought it was Zs = Ze + (R1 + R2) but then I saw the thing about plugging in the tester while the install is live and it tells you the Zs but as I said the readings are very different. </p><p> </p><p></p><p>please help me understand this </p><p></p><p>* its confused me - not convenient fused lol </p></blockquote><p></p>
[QUOTE="Traineeboy, post: 500664, member: 32807"] If I wanted to obtain the Zs for a ring final circuit that had a spur ( furthest point ) Then from what I under I would take the Ze and add the R1 + R2 readings. Ze is 0.15 and R1 + R2 is 0.15 so the measured Zs would be 0.30. However I was told that I could obtain the Zs I wouldn’t have to do the above I would just need to plug my Megger tester in at the furthest socket (in this case it’s a spur so know it’s furthest point ) Put in on Loop Z and L-PE and Select 2 lead Low setting. I did that and got 1.39. Those readings a very different it’s convenient fused me as I thought it was Zs = Ze + (R1 + R2) but then I saw the thing about plugging in the tester while the install is live and it tells you the Zs but as I said the readings are very different. please help me understand this * its confused me - not convenient fused lol [/QUOTE]
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Testing final ring
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