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Electrical Inspection & Testing Forum
different test results on IPF readings
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<blockquote data-quote="Doc Hudson" data-source="post: 484676" data-attributes="member: 1607"><p>You need to remember you are trying to establish what magnitude of current could flow if you stick a dead short across the circuit. So the voltage potential between the conductors, (which can fluctuate) and the impedance path along the circuit, through to your meter probes and meter. Which can also fluctuate depending upon how good a connection you have between leads and circuit. Imagine what happens if the voltage fluctuates up a bit and the continuity of your probe terminations goes down a bit, or vice-versa? You also have the tolerance accuracy of the test meter itself between readings. The sort of variations you describe don't sound that unusual to me. If it was a massive difference, (e.g. 1.234kA and 5.678kA, that would be a bit more concerning). Do the values look appropriate for the Ze and voltages on your test installation? Your main concern is that the largest value you read is within the breaking capacity of your protective devices so it doesn't all go bang! </p><p></p><p>Doc H. </p></blockquote><p></p>
[QUOTE="Doc Hudson, post: 484676, member: 1607"] You need to remember you are trying to establish what magnitude of current could flow if you stick a dead short across the circuit. So the voltage potential between the conductors, (which can fluctuate) and the impedance path along the circuit, through to your meter probes and meter. Which can also fluctuate depending upon how good a connection you have between leads and circuit. Imagine what happens if the voltage fluctuates up a bit and the continuity of your probe terminations goes down a bit, or vice-versa? You also have the tolerance accuracy of the test meter itself between readings. The sort of variations you describe don't sound that unusual to me. If it was a massive difference, (e.g. 1.234kA and 5.678kA, that would be a bit more concerning). Do the values look appropriate for the Ze and voltages on your test installation? Your main concern is that the largest value you read is within the breaking capacity of your protective devices so it doesn't all go bang! Doc H. [/QUOTE]
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different test results on IPF readings
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