DIYbanter - View Single Post - 20 amp circuit/14-2 wire?

From: "deloid"

I am planning to have an isolated ceiling fan switch as an end run of a 20
amp circuit.

I ran 14-2 wire from the fan...to the new switch...to the receptacle that
was 15 amp. As I was preparing to tie this all together I noticed that the
receptacle was fed by 12-2 wire and...sure enough there is a 20 amp breaker.

Since the fan (no lights) hardly pulls any amperage it seems like I should
be able to run the 14-2 anyway.

Thoughts?

No it's illegal.