MJ, very interesting. It seems that a literal interpretation of the Code would allow a building to have one service AND one feeder entering it. I am not sure if this is the intent however, it seems to be something that was overlooked. Article 225-30 limits to 1 feeder with exceptions and Article 230-2 allows only 1 service, again with exceptions.
Yoopersup is on the right track concerning shutting off power to the building. Definite safety considerations there, and not only to firemen, but electricians and maintenance personnel as well.
The 2005 Code allows a building to have extra feeders or services if "enhanced reliability" is a neccesity: 225-30(A)(6) and 230-2(A)(6)
