fuse the primary side of control transformers

[Mister Kool]

what is the code for fusing the primary side of control transformers in a MCC is it required???

this is what can happen if you dont: (the transformer burned out)

 

[petersonra]

430.72(C)(1)through (C)(5)

(3) Less Than 50 Volt-Amperes. Control circuit transformers
rated less than 50 volt-amperes (VA) and that are
an integral part of the motor controller and located within
the motor controller enclosure shall be permitted to be protected
by primary overcurrent devices, impedance limiting
means, or other inherent protective means.