Remember though, this is in RMS (root mean square) so you're always calculating the "DC equivalent". 110 Volts AC in a house is NOT 110 peak it's actually 110 times the square root of 2 (just additional information for ya).
Also, transformers are rated in "VA" (volt/amp) terms. They're power and frequency limited. If it is a 300VA transformer, then 300/12 = 25 Amps rms.
The capacity of the wire won't be the big issue, it will ultimately be dependant upon your breaker. I'll find my IPC spec's on wire and get back to you as to the capacity of the 14 guage wire.
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