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  1. DVSilverstone

    Busway protection

    Hello, this is a question regarding the interpretation of the NEC article 450.3, with connection to 368.17 and 240.4. Here is the situation (in California): A 2000A busway (3ph+G) is to be connected to the secondary of a 1500kVA oil-filled transformer (12.47kV Delta/480V Y, Is~1809A). Two...
  2. DVSilverstone

    SCCR

    UL508A requires that the nameplate of a machine displays the Short Circuit Current Rating of its industrial control panel (Art. 670.3). The means of determining this SCCR for me is through an approved method, but I butt against the terminal block’s low SCCR then, or so I think. That’s what I’m...
  3. DVSilverstone

    SCCR

    Where I work we manufacture a machine delivered as a stand-alone enclosure comprising inside a small control panel which holds some relays, the PLC, the HMI, and terminals for controls. The rest of the power components are laid out inside the main stand-alone enclosure (MCCB, VFD, Input reactor...
  4. DVSilverstone

    SCCR Ratings

    Where I work we manufacture a machine delivered as a stand-alone enclosure comprising inside a small control panel which holds some relays, the PLC, the HMI, and terminals for controls. The rest of the power components are laid out inside the main stand-alone enclosure (MCCB, VFD, Input...

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