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Do-It-Yourself (DIY) Question & Answer Forum
Direct measurement of Zs
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<blockquote data-quote="sparkytim" data-source="post: 129398" data-attributes="member: 8627"><p>Hi Harvey</p><p></p><p>No the regulations only stipulates "Unless unreasonable to do so" or something similar.</p><p></p><p>There is no other way to carry out a Zs test on a lighting circuit.</p><p></p><p>Thats why the test leads should comply with GS38, no need if it was not "Live".</p><p></p><p>Many of us now obtain Zs another way which is acceptable and safer, and recommended by the NICEIC.</p><p></p><p>Zs = Ze + (R1+R2) so we do a Ze at the origin and add it to our R1 + R2s that we have had to obtain when DEAD testing to prove it is safe to energise the circuit.</p><p></p><p>That way we only have to do ONE Live test to obtain all the Zs values required.</p><p></p><p>Many on a Periodic would do Zs direct measurement, but ALWAYS VERY CAREFULLY.</p><p></p><p>Ok? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite2" alt=";)" title="Wink ;)" loading="lazy" data-shortname=";)" /></p></blockquote><p></p>
[QUOTE="sparkytim, post: 129398, member: 8627"] Hi Harvey No the regulations only stipulates "Unless unreasonable to do so" or something similar. There is no other way to carry out a Zs test on a lighting circuit. Thats why the test leads should comply with GS38, no need if it was not "Live". Many of us now obtain Zs another way which is acceptable and safer, and recommended by the NICEIC. Zs = Ze + (R1+R2) so we do a Ze at the origin and add it to our R1 + R2s that we have had to obtain when DEAD testing to prove it is safe to energise the circuit. That way we only have to do ONE Live test to obtain all the Zs values required. Many on a Periodic would do Zs direct measurement, but ALWAYS VERY CAREFULLY. Ok? ;) [/QUOTE]
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Direct measurement of Zs
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