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  1. seamus000

    Neutral sizing in 3P/4W System

    Have reviewed previous postings, but... 120/240 3p/4w system feeding 120/240 distribution panel (all 1p loads, not particularly balanced, and a pump control panel (2 motors powered from 3 phases with no neutral connection, 120v 1p control equipment powered from A-leg to neutral from power...
  2. seamus000

    VFD Common-mode noise

    Suspect that VFD Common-mode noise is effecting instrumentation throughout plant site. Have installed isolator on a single loop going to chart recorder and it clears-up. However, it is out of the question to stick isolators on every loop in the plant. Have line reactors on the VFD outputs...
  3. seamus000

    NEC compliance with regard to TVSS fusing

    All, thank you for your comments.
  4. seamus000

    NEC compliance with regard to TVSS fusing

    NEC compliance with regard to TVSS fusing With regard to NEC Articles 280 & 285: 1) Is fusing of TVSS circuits in compliance? If so, what are the acceptable sizing guidlines? Blown fusing, while protecting the TVSS equipment, would leave the equipment exposed to future spikes, which appears...
  5. seamus000

    NEC compliance with regard to TVSS fusing

    NEC compliance with regard to TVSS fusing With regard to NEC Articles 280 & 285: 1) Is fusing of TVSS circuits in compliance? If so, what are the acceptable sizing guidlines? Blown fusing, while protecting the TVSS equipment, would leave the equipment exposed to future spikes, which appears...
  6. seamus000

    When to use disconnect

    I am installing a new control panel right next to an existing panel. I would like to branch the existing panel's 480vac power from the line-side of its door-mounted disconnect, to provide power to the new panel. The new panel has a subpanel mounted main breaker, but is a door-mounted...

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