National Fire Protection Association. Article 100 Definitions. NFPA 70 National Electrical Code. 1 Batterymarch Park, Quincy, MA 02169: NFPA. 2008: 24 [January 2008]. (原始内容存档于2013-06-15).
National Fire Protection Association. Article 430 Motors, Motor Circuits and Controllers. NFPA 70 National Electrical Code. 1 Batterymarch Park, Quincy, MA 02169: NFPA. 2008: 298 [January 2008]. (原始内容存档于2013-06-15).
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National Fire Protection Association. Article 100 Definitions. NFPA 70 National Electrical Code. 1 Batterymarch Park, Quincy, MA 02169: NFPA. 2008: 24 [January 2008]. (原始内容存档于2013-06-15).
National Fire Protection Association. Article 430 Motors, Motor Circuits and Controllers. NFPA 70 National Electrical Code. 1 Batterymarch Park, Quincy, MA 02169: NFPA. 2008: 298 [January 2008]. (原始内容存档于2013-06-15).