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power from multiple sources

Question asked by wanda.earll on Jan 28, 2020
Latest reply on Jan 28, 2020 by rcramereleceng

Two industrial control panels, 480/60/3 are installed on a machine system. Each has a disconnect switch. One panel houses variable frequency drives, and the low-volt signal wiring for the drives is derived from the other panel that houses the PLC which is the source of the control wiring. Since the disconnect switch on the drive panel does not "kill" the control wiring, are warning labels required on the door of this panel?