2000KVA Transformer secondary taps

[RJC3PO]

Hello,
I am confused about the rules for secondary feeder taps on a transformer.
Basically, I have a 4160/480, Delta/Wye, 2000KVA transformer. I would like to feed 2x480VAC MCC line ups (1x1600amp bus and 1x1200 amp bus).
I was planning on placing the transformer directly outside an existing building adjacent to the MCC line ups (the MCCs are within the building). This however may be changing for other reasons.

My question is:
If I plan to connect the feeds for both MCCs "inside" the transformer secondary enclosure itself and run the two separate feeds directly to the MCCs in there own conduits, are these still considered "taps". If not, are there length limits or cable size issues that I need to consider?

I suspect that the new transformer location may be outside of the 25ft length limit specified in NEC240.21. Other than putting a low voltage switchgear line up in between the transformer and the MCCs (1 feed from the transformer to the LV switchgear with 2 sub feeds to the LV MCCs) what other options do I have?

Thanks
Robert

 

[dpc]

240.21 (C) covers transformer secondaries. Outside secondary conductors are treated differently.

 

[RJC3PO]

Thanks for the response but, how are they treated differently? Do I not have the same length constraint?
Are there other references that you know of that I can review for the rules concerning secondarys that originate for outside locations?
Could anyone tell me where I can find this type of information?

 

[davidbeach]

Read the code.