The wire used for the protective conductor (earth) must be GREEN-AND-YELLOW. Panel Services Colour Coding (single core) Type of Circuit The choice of cable colour initially depends on what type of circuit it is, and whether the voltage is AC or DC. Control Panel Wiring Colour Codes per EN 60204-1 In addition, the International Electrical Commission has also issued a revised standard IEC 60445:2017, covering safety principles for HMI terminals, including the marking and identification of equipment terminals, conductors and conductor terminations. The EN codes supersede the old British Standards (for the time being, at least) and the international standard EN 60204-1 specifically governs Control Panel Wire Colour Codes.ĮN 60204-1 (Safety of Machinery – Electrical Requirements of Machines) sets out both the required safety standards and the type and colour of cable that should be used for wiring an electrical enclosure. ![]() ![]() The colour codes used in the past were originally determined by the British standard regulations BS 7671, but these standards were set down before complex automated systems were even thought of – and they largely related to domestic circuits and static installations.
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