electronicshubImage: electronicshubThe USA have their own wiring colours for electrical circuits,black,red,and blueare used for 208 VAC three-phase; brown,orange and yellow are used for 480 VAC. Australia also have a different wiring colour standard. The UK’s new cable colours for plugs are now harmonise with Europe’s power cable colours for AC &DC.Aug 23 2018Reference: p3connectors/electrical-wiring-colours-standards/Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how Electrical Wiring Colours - The Old and the New (UK) | EC4U Condition of Wiring Cables. If you have the previous colours, red, black and green earth (or bare earth – very dangerous!), we would recommend you have an electrician test to check the integrity of the cable as it could be more than 50 years old and unreliable! You should also be looking at the condition of cables Wiring Colours | Electrical Plug Wire Colours | Old & New The old UK black neutral wire colour was replaced by a blue neutral wire. Old UK red live wire colour was replaced by a brown live wire. The UK earth wires are identified by green and yellow earth wires. What are the new UK Plug Wiring Colours? The United Kingdom now follows the BS 7671 IEC AC plug cable colour codes.