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When Did Wiring Colours Change? | A2Z Electric
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Wiring whenInstalling a new 3 phase supply where required Electrical wiring coloursPhase connection supply yellow green internal wiring commercial machinery diagram electrical three old red where industrial installing required external blue.
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Electrical Wiring Colours - The Old and the New (UK) | EC4U
When Did Wiring Colours Change? | A2Z Electric
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Installing a new 3 phase supply where required - internal and external
UK Electrical Wiring and Cable Colour Guide - With Photos