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  1. edryder

    Harmonic effects on breaker selection.

    Thank you fbulsara and advidana for your post. I have a better idea on how to handle my design. edryder
  2. edryder

    What amp rating to use when using 90C conductors.

    Thanks Mike
  3. edryder

    Harmonic effects on breaker selection.

    Does any one have a rule of thumb or some insite for sizing the main breaker for a panelboard that is going to be used to power computer equipment. Since the load will be 100% non-linear, should the breaker be oversized to makeup for the harmonic currents. The loads will be 208V and 120V. I...
  4. edryder

    What amp rating to use when using 90C conductors.

    If you seclect 75C conductors to feed a 400A panelboard two 3/0 (200A from table 310-16) per phase should work disreguarding all but the amp rating. My question is if 90C conductors were use instead would the amp rating be taken from the 90C column (225A) or the 75C column (200A). From what I...

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