Additional information-
All conductors on the Primary side of the transformer(s) need to be protected at their ampacity. All conductors on the Secondary of the transformer(s) need to either be connected to an over current device or be protected via the over current device on the Primary side of the transformer and factoring in the turns ratio.
It appears to me that the problem Ernie presented using two transformers would need at the very minimum two over current devices to protect the Primaries of the transformers.
NFPA70 2005 Ed.
240.4, 240.21(C)(1), 450.3(B), Table 450.3(B)
