What regulation is concerned with the identification of protective conductors and which colours are required to be used?

The regulation concerned with the identification of protective conductors is defined in the International Electrotechnical Commission (IEC) standards, specifically IEC 60446 and IEC 60445. According to these standards, protective conductors must be identified using green and yellow stripes. This color combination is universally recognized and is essential for ensuring safety by clearly indicating the function of the conductor as a protective earth (PE).