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Question:

What is the minimum size secondary conductor required for a 2 wire 480 volts/ 120 volts transformer rated at 2.3 KVA with 75 degrees C temperature at terminals?

A 14 AWG
Explaination

Secondary transformer current = 2300 / 120 = 19.16 amperes
Refer: NEC Table 310.15(B)(16)
The suitable conductor is 14 AWG with 20 amperes capacity at 75 degrees C