What do you think of the change to the 2014 NEC that provides an exception in Sec. 220.12?
Electrical professionals have long observed the “underloading” of customer-owned transformers. In fact, application of NEC rules for sizing services, feeders, and branch circuits has resulted in unused capacity in almost all occupancy classes for decades. Recognizing that aggressive energy codes are driving energy consumption lower — and that larger than necessary transformers create larger than necessary flash hazard — this revision permits designers to reduce transformer kVA ratings and all related components of the power delivery system.
An exclusive EC&M special report (to be published in the May 2014 issue), written by industry experts Michael A. Anthony, P.E., University of Michigan; Philip Ling, P.E., Power Quality Institute; and Jose Meijer, Peter Basso Associates, discusses the possible sustainability windfall that may be in store for the education facilities industry as a result of this change, not to mention the fact that it may prompt the largest upgrade of commercial building electrical systems in U.S. history.
We’d like to hear your feedback. What’s your take on this important change?