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  1. ougrad1999

    Transformer Powering Reading

    The secondary is Low Resistance Grounded at 200A, I suspected the electrical contractor connected the wrong phasing on the primary side.
  2. ougrad1999

    Transformer Powering Reading

    we powered up a 12.47kv/4.16kv, three phase, delta-wye XFMR and the follwing readings were taken: A to B 4160 A to C 4160 B to C 4160 A to A 5kV B to B 2.5KV C to C 2.5KV A to Gnd 2.4kV B to Gnd 2.4kV C to Gnd 2.4kV what seem to be the problem? we've the doble and TTR testing before...
  3. ougrad1999

    15kV Unshielded Cable Separation

    unshielded cable above 2000V is no longer allowed per NEC 2005, article 310.6.
  4. ougrad1999

    3 pole or 4 pole breakers

    yes, 4P breaker is required per IEC 60364-1 and SquareD tech. paper http://www.schneider-electric.com/cahier_technique/en/pdf/ect172p.pdf

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