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Electrical Inspection & Testing Forum
earth loop impedance
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<blockquote data-quote="davetheglitz" data-source="post: 12078" data-attributes="member: 173"><p>Some older meters were not designed for use with an RCD - probably why it was cheap (I bought an old Metrotest a couple of years ago before I realised this!). Other than buying a new meter the easiest way round this is by calculation. Use the meter to measure Ze at source - no RCD problems there, and then use low ohm meter to measure R1 + Rs (apply short at one end and measure at the other - don't forget to remove the short!) Zs = Ze + R1 + R2.</p></blockquote><p></p>
[QUOTE="davetheglitz, post: 12078, member: 173"] Some older meters were not designed for use with an RCD - probably why it was cheap (I bought an old Metrotest a couple of years ago before I realised this!). Other than buying a new meter the easiest way round this is by calculation. Use the meter to measure Ze at source - no RCD problems there, and then use low ohm meter to measure R1 + Rs (apply short at one end and measure at the other - don't forget to remove the short!) Zs = Ze + R1 + R2. [/QUOTE]
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