The phase "at least" means "a minimum of" to me. That could be construed by others to mean you can put a 30 amp receptacle on a 20 amp circuit. The article and notes you reference are for "two or more receptacles." I guess the NEC Wordsmiths like to keep us electricians confused and watch us scratch our heads trying to figure what the $%*! they mean. Are 40 rated receptacles still avaible? Thanks.