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Can i use 3P breakers In TNC-S earthing system ?

Please find the below answer.
A PEN conductor must never be interrupted under any circumstances. Control and protective switchgear for the several TN arrangements will be:
  • 3-pole when the circuit includes a PEN conductor,
  • Preferably 4-pole (3 phases + neutral) when the circuit includes a neutral with a separate PE conductor.
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