Since @StandardsUMich-led code change to Section 220.12 in the 2011 and 2014 NEC revision cycle other stakeholders are continuing the drive toward getting transformers “rightsized”.

http://standards.plantops.umich.edu/safer/

Linked below is the original First Draft Public comment to change the entire Table 220.12:

13-9 Public Input No. 1582-NFPA 70-2014 Section No. 220.12

Linked below is a Second Draft comment  by the Independent Electrical Contractors regarding Table 220.12.  Note that the IEC proposal limited the change to only office buildings and banks:

13-9 NFPA 2017 Second Draft on CMP 2 – Note Public Comment 1071 on Table 220.12

Linked below is a presentation by the Independent Electrical Contractors at the Second Draft NEC meetings in San Diego:

13-9 NFPA 70 Proposals for 2017 Revision — Presentation by IEC to continue Table 220.12 rewrite

13-9 NFPA 70 National Electrical Code 2017 Revision IEC Issues with proposed revision to 110.16

Existing text:

13-9 NFPA 70_ National Electrical Code (NEC) Article 220