National Electrical Code互聯網檔案館的存檔,存檔日期28 July 2011. — Basis of most US electrical codes. Choose NFPA 70 (general purpose) or NFPA 70A (one and two family dwellings). Free registration required.
National Electrical Code 2011 (2011 ed.), Quincy, Massachusetts: National Fire Protection Association, 2010. — periodically re-issued every 3 years