A couple of interesting facts regarding my OP. The first, I was using an older reference (NEC 2002). Now that I am back in the office, the 2011 allows sizing up to 300% on the primary OCPD pending on its amp draw. For a 200VA control transformer per 725.43 (formally 725.21)
200va / 277v = 0.7 amp primary load
0.7a x 300% = 2.1 or 2 amp fuse maximum
However since I am using #14 on the secondary:
15 amp x 24/277 (xfer ratio) = 1.3 or 1-3/10 amp fuse is the maximum size fuse I can use or:
2 amp primary fuse and 15 amp secondary fuse
Anyone thinks different?
The other interesting fact is they reduced the ampacity for #14 wire from 20 amps to 15. Reasoning according to the ROP report for the 2011 NEC is to put it inline with the CEC. Not for safety, not for electrical issues. So much for the NEC is being about safety...
