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  • Users: dewone
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  1. dewone

    Ka Rating on breakers

    Ever notice that the 7.2 KV breakers and the 15 KV breakers are the same except the nominal voltage is lowered and the Ka rating increased. Been wondering why it gets a higher Ka value?
  2. dewone

    Voltage Unbalance Vector Unknown

    A customer has a utility transformer in a vault. All I can see is that the XO is left disconnected X1-X3 connects to bus duct feeding the facility. The problem is that the voltages run A-B phase 515 V, B-C 515 V, and A-C 515. To ground the voltages get very unbalanced A 251 V, B 437, and C to...

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