Electrical Wiring Color Code Standards Usa. The following iec dc wiring color codes are used for two wire grounded two wire ungrounded and three wire grounded dc power systems. The old color code in uk until 2004 is shown below.
The colors adopted as local practice are shown in table below. The iec dc wiring color codes are adapted from iec ac wiring color codes. Nec of usa defines green green with yellow stripe bare copper for ground wire.
Before that it had its own code for electrical wiring.
The nfpa family of codes and standards that deal with electrical issues are as dynamic as the subjects they address including nfpa 70 national electrical code nec nfpa 70b recommended practice for electrical equipment maintenance and nfpa 70e standard for electrical safety in the workplace these extensive documents reflect changing industry. Any other colors except these may be used for other power lines. The united states electrical codes require that the neutral be connected to earth at the service panel only and at no other point within the building wiring system. The nfpa family of codes and standards that deal with electrical issues are as dynamic as the subjects they address including nfpa 70 national electrical code nec nfpa 70b recommended practice for electrical equipment maintenance and nfpa 70e standard for electrical safety in the workplace these extensive documents reflect changing industry.
