If you look at the first photo posted, the manufacturer states no bigger than a 25 amp breaker. or fuse Just above that is a line that says the minimum ampacity is 14.4. This means you can use a 25 amp breaker with #14 awg because #14 can be used with up to 15 amps. The stated ampacity is what determines the wire size, not the breaker. As far as I know (and I stand ready to be corrected) it may be the only exception to the NEC rules, and it's ok with the NEC. If you can't find a 25 amp breaker, a lot of installers put 25 amp cartridge fuses in the exterior disconnect box. Yes, you can use #12 awg or #10 awg with this as you can always have a larger than required conductor but it is more than what is required. Of course, I agree with you, using larger than required is good, at least in wiring. Also, yes, I think experience means a heck of a lot, but just because someone has done something the same way for 20 years doesn't make it right. And I just went to Home Depot, on the shelf were a GE, a Square D, and an Eaton 25 amp two pole breaker, highest price was 16.80. (http://www.homedepot.com/webapp/wcs/sto ... c=1&Ntpr=1) If you need one, I'll buy it and ship it to you for a small surcharge.