IEEE recommended practice for electric power systems in commercial buildings (Institute of Electrical and Electronics Engineers, 1991)
IEEE Std 241-1990 (Revisión of IEEE Std 241-1983).–Approved 6 December 1990. Reaffirmed 26 June 1997, IEEE Standards Board.–Approved 17 May 1991, American National Standards Institute.–Recognized as an American National Standard (ANSI)