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Student & Learning Zone - City & Guilds
Testing final ring
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<blockquote data-quote="boltonsparky" data-source="post: 500681" data-attributes="member: 4678"><p>Did you take the R1+R2 at the socket fronts (plug in tester) or at the terminals with the probes and did you use the same method when taking the Zs?</p><p></p><p>Worn out sockets and switches can give high readings but if you're using the same method for both dead and live tests this would be irrelevant. Have you nulled the leads, some testers need the leads nulling for live tests too. </p><p></p><p></p><p></p><p></p><p>Calculated Zs is ok if you have a real life measured Ze.</p><p></p><p>If you do it all dead and get your Ze by enquiry and then add on your R1+R2 to get your Zs you can have no effective earth and be unaware of it. </p><p></p><p>Nothing wrong with live testing if you're aware of the risks and take precautions. Live testing on a socket circuit is no more dangerous than plugging in the kettle. Live testing is essential as far as I'm concerned, for the above reason.</p></blockquote><p></p>
[QUOTE="boltonsparky, post: 500681, member: 4678"] Did you take the R1+R2 at the socket fronts (plug in tester) or at the terminals with the probes and did you use the same method when taking the Zs? Worn out sockets and switches can give high readings but if you're using the same method for both dead and live tests this would be irrelevant. Have you nulled the leads, some testers need the leads nulling for live tests too. Calculated Zs is ok if you have a real life measured Ze. If you do it all dead and get your Ze by enquiry and then add on your R1+R2 to get your Zs you can have no effective earth and be unaware of it. Nothing wrong with live testing if you're aware of the risks and take precautions. Live testing on a socket circuit is no more dangerous than plugging in the kettle. Live testing is essential as far as I'm concerned, for the above reason. [/QUOTE]
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Testing final ring
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