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The plug connectors are classified according to the NEMA naming convention. NEMA is an acronym for the National Electrical Manufacturers Association. The NEMA classification breakdown:* Straight Blade or Locking** Straight Blade (non-locking connector)*** NEMA 1*** NEMA 2*** NEMA 5*** NEMA 6*** NEMA 10*** NEMA 14*** NEMA TT-30** Locking (twist lock connector)*** NEMA L5*** NEMA L6*** NEMA L7*** NEMA L21