PLC Grounding Rules

PLC
1

Good grounding rules include

  • each PLC component should be grounded back to the main PLC chassis

  • the ground wire should be separated from power wiring in enclosures

  • use star washers to ensure good electrical connection

  • mount ground wires on bare metal, remove paint if needed

  • use 12AWG stranded copper for PLC equipment grounds and 8AWG stranded copper for enclosure backplate grounds

  • connect the enclosure to the ground bus

  • connect the machine ground to the enclosure ground

  • the ground connection should have little resistance (<0.1 homs is good)

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