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Do-It-Yourself (DIY) Question & Answer Forum
testing Zs through RCD
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<blockquote data-quote="Robojin" data-source="post: 69315" data-attributes="member: 2209"><p>As I have commented in another thread <a href="http://www.talk.electricianforum.co.uk/showthread.php?t=5122" target="_blank">http://www.talk.electricianforum.co.uk/showthread.php?t=5122</a></p><p></p><p>RCD's appear to effect the Zs reading on some RCD and Tester combinations</p><p></p><p>If you need to confirm your Zs on RCD circuits, then Ze on the incoming side of the RCD and then ze on the out going (energised), if either Ze readings differ deduct the incoming reading from the outgoing, deduct the result from the Zs measured on your meter, the result should be similar to your Ze+(R1+R2) measurements, and will stop you headbang like I did one morning this week</p><p></p><p>Incidentally if you measure ohms across the RCD single (unenergised) L or N pole you will get 0.00ohms, this error only appears under Zs test conditions</p></blockquote><p></p>
[QUOTE="Robojin, post: 69315, member: 2209"] As I have commented in another thread [URL="http://www.talk.electricianforum.co.uk/showthread.php?t=5122"]http://www.talk.electricianforum.co.uk/showthread.php?t=5122[/URL] RCD's appear to effect the Zs reading on some RCD and Tester combinations If you need to confirm your Zs on RCD circuits, then Ze on the incoming side of the RCD and then ze on the out going (energised), if either Ze readings differ deduct the incoming reading from the outgoing, deduct the result from the Zs measured on your meter, the result should be similar to your Ze+(R1+R2) measurements, and will stop you headbang like I did one morning this week Incidentally if you measure ohms across the RCD single (unenergised) L or N pole you will get 0.00ohms, this error only appears under Zs test conditions [/QUOTE]
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testing Zs through RCD
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