what does nec mean
Initialism [edit]. NEC. 1  Not Elsewhere Classified, a phrase used in classification codes such as Standard Industrial Classification, International Standard Classification of Occupations, DSM-IV-TR, DSM-5, ICD-9, and ICD-10.2  National Exhibition Centre.3  National Executive Committee (of a political party). 4  Nippon Electric Company, Ltd. 5  National Electrical Code: its ...nitialism [edit]. NEC. 1  Not Elsewhere Classified, a phrase used in classification codes such as Standard Industrial Classification, International Standard Classification of Occupations, DSM-IV-TR, DSM-5, ICD-9, and ICD-10.