SMACNA also says that the CAD standard is designed to encourage consistency by building upon the second edition of the National CAD Standard (NCS), published by the National Institute of Building Sciences in 2001. The NCS incorporates the efforts of the American Institute of Architects (AIA) and its CAD Layer Guidelines as well as the Construction Specifications Institute (CSI) and its Uniform Drawing System, plus contributions from many other participating organizations.
Publication date: 10/08/2001