Understanding Cable Color Codes: A Comprehensive Guide

Different cable colors
Different cable colours

At Romtronic, we often encounter questions about the standardization of wire and cable colours. While the Institute of Electrical and Electronics Engineers (IEEE) guides electrical design, it does not specify cable colours for particular purposes or functions. Instead, the push for standardization primarily comes from the private sector, particularly the telecommunications industry. This guide explores the world of cable colours, their meanings, and their application

Cable Color Sta

No universally accepted standard exists across industries for cable colour schemes. These can vary widely depending on the industry, installation date, and country of origin. For instance, a purple cable manufactured in the early 2010s in the US might serve a different

Organizations like IEEE, the Telecommunications Industry Association (TIA), and the Department of Defense (DoD) offer some guidance, but these are often viewed as recommendations rather than requirements. Until universal standards are adopted, variations in cable colours will persist.

Ethernet Cable Colors and Their Meanings

Ethernet cables, commonly used in computer networking for residential and commercial applications, often come in various colours. The colour does not affect performance but helps denote the intended application. Here are some common colours and their typical uses:

  • Gray: Standard Ethernet connections are available in residential and commercial networks.
  • Green: Crossover connections, are used to connect different computers and devices directly.
  • Yellow: Power over Ethernet (PoE) connections, delivering a 30W current via twisted cable pairs.
  • Blue: Terminal server connections, enabling multiple systems to connect to a LAN network without a modem.
  • Black: Often used for outdoor cables, featuring waterproof jackets for durability in the elements.

Department of Defense (DoD) Ethernet Cable Colors

The DoD uses different cable colours to signify data classification levels:

  • Yellow: Top secret data
  • Red: Mid-level classified data
  • Blue: Unclassified data

Patch Cable Color Standards

Patch cable colours also lack universal standards, but some institutions, like the University of Wisconsin Network Services Department, have set examples by defining specific colour uses:

  • Gray: Standard Ethernet connections
  • Green: Crossover Ethernet connections
  • Yellow: PoE connections
  • Orange: Analog non-Ethernet connections
  • Purple: Digital non-Ethernet connections
  • Blue: Terminal server connections
  • Red: IP cameras
  • Black: General use
  • Pink and White: Additional options for flexibility

Cat6 Cable Color Standards

Cat6 cables, used for Ethernet networks, also follow colour coding to denote their purpose. Here are some common Cat6 cable colours:

  • Blue: Network connectivity
  • Yellow: Wired security cameras
  • White: Wired security cameras
  • Gray: Interconnections (jumpers)
  • Black: Equipment, peripherals, and workstations
  • Red: VoIP phone systems or emergency communications

Network Cable Color Chart

The ANSI/TIA/EIA-606-A standard, “Administration Standard for the Telecommunications Infrastructure of Commercial Buildings,” provides extensive guidelines for labelling and identifying cables. While an official colour chart is rare, here’s a general guide based on industry practices:

  • Purple: Termination of cables to common devices (e.g., computers, LANs)
  • Blue: Termination of telecommunications media (often in equipment rooms)
  • Green: Crossover connections
  • Yellow: Alarms, security, and various circuits
  • Orange: Demarcation point or central office termination
  • Red: Phone systems
  • White: First-level backbone cable
  • Grey: Second-level backbone cable

Electrical Safety

Colour coding wires significantly contribute to electrical safety by preventing accidents. For example, in North America, red wires typically indicate hot or live wires, while black wires signify neutral wires. Green or bare wires are designated for grounding. These colour distinctions ensure proper wiring, reducing the risk of electrical shocks and fires.

North American Conductor Color Codes

  • 3-wire: Green (ground), White (neutral), Black (line)
  • 4-wire: Green (ground), Black (line), Red (line), White (neutral)
  • 5-wire: Green (ground), White (neutral), Black (line), Orange (line), Red (line)

International Conductor Color Codes

  • 3-wire: Green/yellow (ground), Blue (neutral), Brown (line)
  • 4-wire: Green/yellow (ground), Brown (line), Black (line), Gray (line)
  • 5-wire: Green/yellow (ground), Blue (neutral), Brown (line), Black (line), Gray (line)

Using standardized colour codes globally helps manufacturers streamline production and ensure consistency in safety standards.

Circuit Identification

Colour coding simplifies circuit identification, enabling electricians to determine each wire’s function quickly. For instance, blue wires are often used in three-way switches, while yellow cables are utilized for three-phase power systems. This practice enhances the speed and accuracy of troubleshooting and repairs.

Installation and Maintenance

Colour-coded wires help technicians identify the correct cables for specific installation and maintenance tasks. This reduces errors, saves time, and ensures the reliability of electrical systems.

Aesthetic Purposes

Colour coding also serves aesthetic purposes. Manufacturers of electronic devices often use coloured wires to enhance the visual appeal of their products. This can make products more attractive to consumers and improve the user experience.


In some cases, wire colours communicate specific information. For example, Ethernet cables often come in different colours to indicate the cable’s category or bandwidth capacity. This helps network technicians quickly identify the appropriate wires for various applications.

Creating Custom Wire Jacket Colors

To meet specific needs, custom wire jacket colours can be created by partnering with custom cable manufacturers. This ensures the colour scheme aligns with the existing design system, facilitating maintenance and troubleshooting.


While there is no universal standard for cable colours, adhering to common practices can greatly simplify network maintenance and troubleshooting. For consistent and efficient cable management, it is advisable to establish and maintain a consistent colour scheme within your network. By understanding and utilizing these colour codes, network management becomes more straightforward and efficient, reducing the complexity and potential for errors.

By understanding and adhering to established cable colour codes, electricians and technicians can work more efficiently and safely, ensuring that electrical systems are reliable, safe, and visually appealing.