Electrical Wiring Colours Codes in AU- A Complete Guide

The Australian electrical wiring colours coding standard was made in 1894 and is the universal system for colouring wires. Since 2000, it has been mandatory to follow the standard, which has become a regulated code. It is also endorsed by the Australian Standards Association (ASA). You must understand the codes for each wiring colour, which will facilitate you to work safely with wiring within your home or as part of a commercial business.

Here is a simple guide that decodes various electrical wiring colours:

• Single-phase electrical wiring colours: Red, Orange, Yellow, Green, Blue, Brown, Black, White
• Three-phase electrical wiring colours: Red, Green, Black, and White

Single Phase Electrical Wiring Colours

Yellow: A yellow colour-coded wire indicates that the wire is grounded, generally above the ground. Yellow coding is usually overlapped with green-coded wires. Yellow wires transmit power, which acts the same as blue wires.

Red: A red colour-coded wire indicates the wire is live. More explicitly, red indicates conductors that are single-fibre, four-fibre or a twisted pair.

Orange: An orange colour-coded wire works like red, indicating a live conductor. The orange-coded wire differs in how it works; it transfers a voltage when joined to a socket but not when it is grounded.

Blue: A blue colour-coded wire indicates one of the two types. The wire is Earth Return (ER) or Earth Line (EL). Blue wires transfer power but are not used within the electrical device’s outlet wiring.

Green: A green colour-coded wire indicates that the wire is earthed or grounded. It usually comprises a single paint coat and is marked in parallel with another neutral wire.

White: A white colour-coded wire indicates general and signal wires. You can also use white wires to reveal a neutral wire.

Black: A black colour-coded wire serves as a neutral wire. These wires are responsible for transferring the circuit back to the power source. It enables current circulation through the whole system.

Brown: A brown colour-coded wire is a shielding earthing wire. It’s generally used for underground installations—brown-field grounding for marking neutral wiring.

Three-Phase Electrical Wiring Colours

Black: In the 3-phase wiring, black wires indicate Neutral wires known as N.

White: In the 3-phase wiring, white wires indicate Line 2 wires known as L2 – a live wire.

Red: In the 3-phase wiring, red wires indicate Line 1 wires, also known as L1 – a live wire.

Green: In the 3-phase wiring, green wires indicate Earth wires, also known as E – it earths the system.

Colour Codes In Older Homes

Depending on the lifespan of the conductor, the wiring was colour coded in older homes. For instance:

• Yellow:The conductor is designed to only reach a preset length of wire before attaching to an earth wire.
• Red: The conductor is designed to continue its travel beyond the preset length and can link to a signal wire.

Current Australian Electrical Wiring Colour Standards (Post-2000)

While older homes in Australia may still contain legacy wiring colours, modern electrical installations must comply with the updated Australian wiring standards introduced after 2000. These standards align with international IEC guidelines and are outlined in AS/NZS 3000 (Wiring Rules).

Understanding the current colour codes is essential for safety, especially when upgrading, renovating, or working alongside existing wiring systems.

Single-Phase Wiring Colours (Current Standard)

In modern Australian single-phase AC electrical systems, the following wire colour codes are used:

• Live / Active (L): Brown
  
• Neutral (N): Blue
  
• Earth (E): Green with Yellow stripes
  

This system replaced the older Red (Live), Black (Neutral), and solid Green (Earth) wiring used in pre-2000 installations.

Three-Phase Wiring Colours (Current Standard)

For three-phase electrical systems, commonly found in commercial buildings and high-load residential installations, the current Australian colour codes are:

• Phase 1 (L1): Brown
  
• Phase 2 (L2): Black
  
• Phase 3 (L3): Grey
  
• Neutral (N): Blue
  
• Earth (E): Green with Yellow stripes
  

These colours are now standard across new installations and electrical equipment in Australia.

Older Wiring Colour Codes (Pre-2000 – Quick Reference)

In older Australian homes and buildings, you may still encounter the following wiring colours:

• Live / Active (L): Red
  
• Neutral (N): Black
  
• Earth (E): Green (solid colour)
  

Mixed wiring systems are common during renovations, making proper identification and testing essential.

Key Safety Takeaways

• Safety First: The Green/Yellow Earth wire plays a critical role in protecting against electric shock by grounding exposed metal components.
  
• Mixed Wiring Systems: Older properties may contain both legacy and modern wiring colours—never assume wire function based on colour alone.
  
• Equipment vs Building Wiring: Electrical appliances and imported equipment often follow modern international colour standards, even when connected to older building wiring.
  

For any electrical work, testing and verification by a licensed electrician is always recommended.

Contact Eris Electrical

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