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Sheathing Question for 220

Question asked by directionalism on May 6, 2019
Latest reply on May 6, 2019 by chiefns830

Where in the codes doe it state what kind of sheathing is required for wiring through floor joists?  I am going to pick a wire to run 220.  I assume that single wires coated with plastic is not to code, when I say single wires I am referring to.typical house wiring, white and yellow Romex  NM-B Cable, ie the three wires inside it, a bear copper wire and two covered wires and paper.  When running wires through joists what is the code configuration?  Is sheathing always required, I would assume it is.