The largest conductor permitted in 3 8 flexible conduit is 14 AWG.
This is the maximum size of wire that can be installed in this type of conduit:
- 12 AWG for 1/2 and larger conduits with three or more wires
- 14 AWG for 3/8 and smaller conduits with two or fewer wires.
It is important to take into account both the gauge of the wire and the size of the conduit when determining what size conductor should be used.