The colours used for phase wires vary from country to country, so make sure to check before installing an electrical supply. The old IEC colour code uses red, blue, and green for the live conductor and black for the neutral conductor. In the UK, however, the IEC code has recently replaced that old colour-code with a new one.

New UK Wiring Colours ; Green, Blue, Brown, Black ; Green, Blue, Brown, Black 

The wire color codes for this category is as follows: Single Phase, Line (Hot) - Black or Red 3 Phase, Phase 1 - Black 3 Phase, Phase 2 - Red 3 Phase, Phase 3 - Blue Neutral - White Ground - Green, Green with Yellow Stripe, or Bare Wire Fig. 2 - 120/208/240 Volt AC Wiring Color Codes in USA 277/480 Volt AC Wiring Color Codes in USA

High-Voltage Wire Color Code · Phase 1 wiring should be brown. · Phase 2 wiring should be orange. · Phase 3 wiring should be yellow. · Neutral wires 

In the UK, the neutral wire colour is blue. The neutral wire transfers electricity away from the appliance to avoid overloading. It is located at the circuit end to enable connection once electricity has flowed around the earth and live wires. It is highly unlikely that you will have an electric shock on contact with a blue wire.

Why have the wiring colour codes changed? In 2006, an amendment was made to the BS7671 Wiring Regulations, and the wiring colours in the UK were changed to comply with the specifications of the IEC 60446 international standard.This was done to harmonise the UK colours with the ones across Europe.

UK Control Panel Cable Size & Colour Code Guidelines Revised July 2006 to incorporate colour code and Phone wire color codes - Cowboy Frank Phone Wire Color Codes The Nitty Gritty.

India Standard – single-phase and three phase wire colour code. The electrical wire color code in India is the same as the old UK color codes. Phase – 1: Red. Phase – 2: Yellow. Phase – 3: Blue. Neutral: Black. Earth or protective conductor: Green/Yellow or green or bare conductor. Wiring color code followed in India.

The UK and Europe's neutral wire cable colour is blue. What colour is the live wire? Live wire cable colours in the UK and Europe are brown.

USA Wiring Colours. In America, electricians and electrical contractors are legally required to comply with the National Electrical Code (NEC) for the colour coding of wires. This nationally-recognised code specifies that neutral wire should be of a white or grey colour, with green or green and yellow-striped patterning for the ground wire.

Electrical Wiring Colour Guide For The UK · Red – live · Black – neutral · Green/yellow – earth · Brown – live · Blue – neutral · Green/Yellow – earth.