I have a question concerning concerning control panel disconnect requirements per NFPA 79. It would appear that the a disconnect for all supply voltage/voltages that enter said control panel is/are required to be located physically on the control panel itself. I have an application where I am building a system with two PLC's (located in 2 different physical areas) an HMI (located remotely from the PLC's) and 3 remote I/O stations. A couple of the stations will need to control different supply voltages with separate power feeds for motor control. Obviously, I will be using motor starters for each separate voltage that I will be controlling via PLC, remote I/O or HMI. Nonetheless, it appears from my take on NFPA 79 that I'm required to have a disconnect for the control panels that will separate all ungrounded conductors that pass through the control panel. This would entail a rather ungainly disconnect assy capable of handling a large current and numerous large conductors. I believe I'm missiing something about the requirements of NFPA 79, can anyone help?
