Have a bathroom fed by a 20-amp circuit. I replaced the switches from
plain toggle to Decora style. The problem is the power feed wire and
wires to the lights/fan are #12s.

I found it difficult to properly pigtail and pushing all the #12 wires
back into the box due to their stiffness and the increased switch
size.

Is it acceptable to run/replace the one feeding the switches and wires
to the lights/fan with #14s. The power feed is up in the attic space
in a J-box that contains another #12 to the vanity outlet.


thanks
richard