Since 450.3 says "Overcurrent protection...comply with...(A), (B), or (C).", if I am providing overcurrent protection per (B), then I am not required to provide primary fuse protection for my indoor voltage transformer, correct?
If I choose to only follow (C), I can pick any size fuse I want because there is no reference to a table in (C), correct?
Or should 450.3 read "...(A) or (B) and (C)? What's the intent?
A "voltage transformer" is not a power transformer. It is a precision transformer used in protective relay systems. Different deal altogether. For power transformers you are either 450.3 A or B depending on voltage.
I agree they could have a more informative FPN here.
Thanks Greg. That sounds right based on the FPN, but without any explicit definitions, a search for 'voltage transformer' on the net brings up a lot of stuff. Anyone have the original substantiation on this section? Or a link to a manuf. web site that shows a voltage transformer as intended in the code section? Thanks again. An Engineer is going to be happy