On 1/25/2014 9:55 AM, (PeteCresswell) wrote:
I've got an outlet box that is fed by #12 Romex backed by a 20-amp
breaker.

If I were to tap that box to feed a ceiling light, would #14 wire be
code-legal for box-to-ceiling-light?

If I were to pick nits, I might say "No" because conceivably somebody
might plug a load into the ceiling light that exceeded 15 amps....
OTOH.... ?

As I understand it, at least in Michigan, If you use a 20 amp
circuit/breaker, code requires 12 gauge wire. 15 amp requires 14 gauge.
Therefore, the 14 gauge would not be code if using on a 20 amp circuit.