The source for a PLC power supply is generally single-phase and 120 or 240 VAC. If the controller is installed in an enclosure, the two power leads (L1 hot and L2 common) normally enter the enclosure through the top part of the cabinet to minimize interference with other control lines. For more in details - asasmy.com -> PLC Info Catagory -> PLC Power Supply Safety . Article Link -> LINK
**refference credit is in the link site below**
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