ATS as disconnecting means on the secondary of a Xfmr.

[egurdian3]

Here's the pic: 480V Em-Gen, Fused Safety Disconnect Sw, Feeds 150KVA Xfmr.
Xfmr feeds ATS which feeds MLO Dist. Panel, in the same room, within 15'.
Question: is a Disconnecting Means required before the Dist. Panel?
Check the included PDF.

 

[steve66]

I'd say overcurrent protection is probably required or you would have a violation of 240.21(C).

 

[augie47]

I agree with Steve66 (Post #2). Since you have a wye secondary, you have to provide secondary overcurrent protection and no 240.21(C) sections seems to allow any relief from that rule.