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Student & Learning Zone - City & Guilds
IR and EFLI question
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<blockquote data-quote="a1pacino" data-source="post: 411283" data-attributes="member: 158"><p>Hi guys,</p><p></p><p>I have a couple of questions on my mock paper that I am unsure about and would appreciate any input with these questions, I have put my answers below in blue, many thanks in advance.</p><p></p><p>1. an insulation resistance test on a circuit indicated zero Megohms between line and neutral. explain why the result of the previous R1+R2 test could not be used to confirm polarity for their circuit.</p><p></p><p>the IR test is between L/N and the previous R1+R2 test is between L/E so cannot be used to confirm polarity for this circuit.</p><p></p><p>2. State why earth loop impedance test result is likely to be less than the sum of the recorded values of (R1+R2) and Ze?</p><p></p><p>The test result would be at ambient temperature and the calculated value includes the 70 degree correction factor of 1.2 to raise the value of Zs during current flow and higher conductor temperature</p></blockquote><p></p>
[QUOTE="a1pacino, post: 411283, member: 158"] Hi guys, I have a couple of questions on my mock paper that I am unsure about and would appreciate any input with these questions, I have put my answers below in blue, many thanks in advance. 1. an insulation resistance test on a circuit indicated zero Megohms between line and neutral. explain why the result of the previous R1+R2 test could not be used to confirm polarity for their circuit. the IR test is between L/N and the previous R1+R2 test is between L/E so cannot be used to confirm polarity for this circuit. 2. State why earth loop impedance test result is likely to be less than the sum of the recorded values of (R1+R2) and Ze? The test result would be at ambient temperature and the calculated value includes the 70 degree correction factor of 1.2 to raise the value of Zs during current flow and higher conductor temperature [/QUOTE]
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IR and EFLI question
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