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Electrical Inspection & Testing Forum
Some pics from that hotel PIR
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<blockquote data-quote="Sidewinder" data-source="post: 132990" data-attributes="member: 9512"><p>Kevin,</p><p></p><p>The only way you can get the PFC for an install like this is from the DNO unless it is a private transformer then the dsigner will have to supply it by calculation.</p><p></p><p>The impedance of the transformer windings will come into play as will the impedance of the HV supply and many, may other factors.</p><p></p><p>The Powerpact should break 65kA as I read it so that will (should) limit your PFC to that.</p><p></p><p>At such low values of impedance giving these high fault values the undertainty of measurement especially with MF testers is significant.</p><p></p><p>The earth impedance path measurement needs to be done with high accuracy Ductor type meters capable or reading to a precision of milli-ohms as the PFC could easily heat up what appears to be conventionally sound joints.</p><p></p><p>Will have a look at the rest and think some more.</p></blockquote><p></p>
[QUOTE="Sidewinder, post: 132990, member: 9512"] Kevin, The only way you can get the PFC for an install like this is from the DNO unless it is a private transformer then the dsigner will have to supply it by calculation. The impedance of the transformer windings will come into play as will the impedance of the HV supply and many, may other factors. The Powerpact should break 65kA as I read it so that will (should) limit your PFC to that. At such low values of impedance giving these high fault values the undertainty of measurement especially with MF testers is significant. The earth impedance path measurement needs to be done with high accuracy Ductor type meters capable or reading to a precision of milli-ohms as the PFC could easily heat up what appears to be conventionally sound joints. Will have a look at the rest and think some more. [/QUOTE]
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Some pics from that hotel PIR
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