On 02/21/2017 02:38 PM, philo wrote:

[snip]

If you use 12 and 14 the circuit breaker could not exceed 15 amps due to
the #14 wire. Since the breaker cannot exceed 15 amps then there is no
need to use #12 wire.

15A in #12 gives lower voltage drop than 15A in #14.

[snip]