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Recent content by flexagon

  1. flexagon

    Power Cable Calculation MV/HV

    IMHO rcwilson is on a good path and we all agree that 5m can be safely 'ignored' from engineering point of view...but I am looking for a proven way/method to demonstrate this to my educated client. My feeling is that IEC287 derating formulas are obtained for lim d->inf, where d is the length of...
  2. flexagon

    Power Cable Calculation MV/HV

    Question to hbarton and to cable calc experts: what if installation in pipe ducts constitutes 5% (or 1%) of the route? should we still consider this as the worst case for IEC287 cable derating calculations? is there a related clause in IEC or other standard that binds route length to what is...
  3. flexagon

    Short Circuit Forces

    this should work... http://www.schneider-electric.com/documents/technical-publications/en/shared/electrical-engineering/electrical-know-how/low-voltage-minus-1kv/ect162.pdf
  4. flexagon

    Why UPS closes bypass and not shunt trip the breaker?

    more on this issue. quoting a manufacturer's technical specification: "During a fault within the load or a short circuit, the UPS will limit the amount and the duration of the current supplied (current limited), in order to protect the UPS inverter output(short circuit current). The amount of...

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