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Do-It-Yourself (DIY) Question & Answer Forum
Direct measurement of Zs
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<blockquote data-quote="ADS" data-source="post: 129407" data-attributes="member: 7231"><p>Probably more accurate than the calculation - R1 + R2 is the resistance of the two conductors added together, end of.</p><p></p><p>Zs is impedance of the fault loop, including parallel paths.</p><p></p><p>The calculation should only really be used as a guide to what the approx. Zs measurement should be.</p><p></p><p>Understanding needs to be gained of the difference between 'working live' - e.g. connecting up a light switch without isolating first, and 'live testing', which is a necessity.</p><p></p><p>As stated in an earlier post - the 2391 exam has you Zs testing every circuit.......why?.......because they want to be sure you know how to do it.</p><p></p><p>Anyone can calculate it<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="ADS, post: 129407, member: 7231"] Probably more accurate than the calculation - R1 + R2 is the resistance of the two conductors added together, end of. Zs is impedance of the fault loop, including parallel paths. The calculation should only really be used as a guide to what the approx. Zs measurement should be. Understanding needs to be gained of the difference between 'working live' - e.g. connecting up a light switch without isolating first, and 'live testing', which is a necessity. As stated in an earlier post - the 2391 exam has you Zs testing every circuit.......why?.......because they want to be sure you know how to do it. Anyone can calculate it:) [/QUOTE]
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Direct measurement of Zs
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