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...
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...
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...
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...
