Technical Reference
Cable Wiring Color Code Charts
Comprehensive reference for NEC (North American) and IEC (International/European) cable color standards. Covers AC power, DC power, grounding, control wiring, and instrumentation -- essential for engineers, electricians, and procurement professionals specifying cables for global projects.
Important: Color codes are for reference only. Always verify against the applicable local electrical code, project specifications, and cable manufacturer documentation before installation. Color standards may vary by country, voltage level, and application.
Section 01
AC Power Wiring Color Codes
AC power wiring color identification for single-phase and three-phase systems. Standards differ significantly between North American (NEC) and international (IEC) conventions.
Single-Phase AC (120V / 240V)
Black
Hot / Line 1
Phase conductor carrying current. Used for the first hot wire in single-phase 120V circuits.
White
Neutral
Grounded conductor. Returns current to source. Must be white or gray per NEC 200.6.
Green
Ground (PE)
Equipment grounding conductor. Green, green/yellow stripe, or bare copper. NEC 250.119.
Three-Phase AC -- 208V System (120/208V Wye)
| Conductor | Color | Swatch | Function | Voltage to Ground |
|---|---|---|---|---|
| Phase A (L1) | Black | Hot conductor, Phase A | 120V | |
| Phase B (L2) | Red | Hot conductor, Phase B | 120V | |
| Phase C (L3) | Blue | Hot conductor, Phase C | 120V | |
| Neutral | White / Gray | Grounded neutral conductor | 0V | |
| Ground (PE) | Green / Bare | Equipment grounding conductor | -- |
Three-Phase AC -- 480V System (277/480V Wye)
| Conductor | Color | Swatch | Function | Voltage to Ground |
|---|---|---|---|---|
| Phase A (L1) | Brown | Hot conductor, Phase A | 277V | |
| Phase B (L2) | Orange | Hot conductor, Phase B | 277V | |
| Phase C (L3) | Yellow | Hot conductor, Phase C | 277V | |
| Neutral | Gray | Grounded neutral conductor | 0V | |
| Ground (PE) | Green | Equipment grounding conductor | -- |
* NEC does not mandate specific colors for ungrounded conductors (phases) above 120V. Brown/Orange/Yellow is industry convention for 480V systems. Black/Red/Blue for 208V is widely adopted practice.
Three-Phase AC -- IEC/European Standard (400V / 230V)
Brown
Phase L1
First phase conductor (formerly Red in old UK)
Black
Phase L2
Second phase conductor (formerly Yellow in old UK)
Grey
Phase L3
Third phase conductor (formerly Blue in old UK)
Blue
Neutral (N)
Neutral conductor (formerly Black in old UK)
Green/Yellow
Ground (PE)
Protective earth. Mandatory bicolor stripe per IEC.
| Conductor | IEC Color | Swatch | Old UK (pre-2004) | Old European | Standard Ref. |
|---|---|---|---|---|---|
| Phase L1 | Brown | Red | Brown / Red | IEC 60446, HD 308 | |
| Phase L2 | Black | Yellow | Black / Yellow | IEC 60446, HD 308 | |
| Phase L3 | Grey | Blue | Grey / Blue | IEC 60446, HD 308 | |
| Neutral (N) | Blue | Black | Light Blue | IEC 60446 | |
| Ground (PE) | Green/Yellow | Green/Yellow | Green/Yellow | IEC 60446 | |
| PEN Conductor | Green/Yellow + Blue marking | -- | Combined PE+N | IEC 60446 |
Section 02
DC Power Wiring Color Codes
DC wiring color codes for solar PV, battery energy storage systems (BESS), telecommunications, and industrial DC power applications.
| Conductor | Color | Swatch | Application |
|---|---|---|---|
| Positive (+) | Red | DC positive rail | |
| Negative (−) | Black | DC negative rail | |
| 3-wire Positive | Red | +V in 3-wire DC | |
| 3-wire Negative | Black | −V in 3-wire DC | |
| Mid-wire | White / Gray | Center tap / mid-point | |
| Ground (PE) | Green | Equipment ground |
| Conductor | Color | Swatch | Application |
|---|---|---|---|
| Positive L+ | Brown | DC positive (solar, BESS) | |
| Negative L− | Grey | DC negative (solar, BESS) | |
| Mid-point M | Blue | Mid-wire / center tap | |
| Ground (PE) | Green/Yellow | Protective earth |
Solar PV DC Wiring (IEC 62548 / NEC 690)
Red / Brown
PV+ String positive
Black / Blue
PV− String negative
Orange
High-voltage DC (NEC)
Green/Yellow
PE / Frame ground
Section 03
Grounding & Protective Earth Color Codes
Protective earth (PE) and grounding conductor identification is among the most safety-critical color coding requirements. Standards are largely harmonized globally, but important differences exist.
Green / Yellow
IEC / EU / Most International
Mandatory bicolor stripe. IEC 60446 requires green/yellow for PE conductors. Most widely used standard globally.
IEC 60446 · BS 7671 · AS/NZS
Green (solid)
NEC -- North America
Solid green or green with yellow stripe. Bare copper also permitted. NEC 250.119 specifies equipment grounding conductor.
NEC 250.119 · NFPA 70
Bare Copper
NEC / Common Practice
Uninsulated bare copper conductor. Common for equipment grounding in conduit systems and ground bus connections.
NEC 250 · NEMA
Green/Yellow + Blue ends
PEN Conductor
Combined protective earth and neutral (PEN). Green/yellow body with blue marking at terminations. TN-C systems.
IEC 60446 · TN-C Systems
| Conductor Type | NEC (USA/Canada) | IEC (EU/International) | UK (BS 7671) | Australia (AS/NZS) | China (GB) |
|---|---|---|---|---|---|
| Protective Earth (PE) | Green | Green/Yellow | Green/Yellow | Green/Yellow | Yellow/Green |
| Neutral (N) | White/Gray | Blue | Blue | Blue | Light Blue |
| PEN Conductor | Not used | Green/Yellow + Blue ends | Green/Yellow + Blue ends | Not common | Yellow/Green + Blue |
Section 04
Control Wiring Color Codes
Control circuit wiring for motor starters, PLCs, relay panels, and industrial automation systems. Used in Jinda control cables (KVV, KVVP, KVVRP series) and instrumentation applications.
| Function | Color | Swatch | Notes |
|---|---|---|---|
| AC Control Hot (L1) | Black | 120V AC control power | |
| AC Control Neutral | White | Neutral return | |
| DC Control Positive | Red | 24VDC / 48VDC positive | |
| DC Control Negative | Blue | 24VDC / 48VDC return/negative | |
| Interlock / Safety | Yellow | Safety interlock circuits | |
| Control Ground | Green | Panel / cabinet ground | |
| Spare / Unused | Orange | Spare conductors, future use |
| Function | Color | Swatch | Notes |
|---|---|---|---|
| AC Control Phase | Red / Brown | 230V AC control phase | |
| AC Control Neutral | Blue | Neutral return | |
| DC 24V Positive | Red / Brown | 24VDC positive rail | |
| DC 24V Negative / 0V | Blue / Black | 0V / negative return | |
| Safety / Emergency | Orange | Safety function circuits | |
| Protective Earth | Green/Yellow | PE conductor | |
| General Signal | White / Grey | Signal / data lines |
Multi-Core Control Cable Color Sequence
For multi-core control cables (4-37 cores), IEC 60446 and GB/T 3956 define a standardized color sequence. Jinda KVV/KVVP control cables follow this sequence:
Cores beyond 12 repeat with number markings or use sequential numbering per IEC 60446 Table 2.
Section 05
Instrumentation & Signal Cable Color Codes
Color codes for thermocouple extension cables, analog signal cables (4-20mA, 0-10V), and digital fieldbus cables used in process control and industrial automation.
Thermocouple Extension & Compensating Cable Colors
| TC Type | Positive (+) | Negative (−) | Overall Jacket | IEC 60584-3 | ANSI/ISA MC96.1 | Temp Range |
|---|---|---|---|---|---|---|
| Type K (NiCr/NiAl) | Green | White | Green | Green (+) / White (−) / Green jacket | Yellow (+) / Red (−) / Yellow jacket | −200 to 1260°C |
| Type J (Fe/CuNi) | Black | White | Black | Black (+) / White (−) / Black jacket | White (+) / Red (−) / Black jacket | −40 to 750°C |
| Type T (Cu/CuNi) | Brown | White | Brown | Brown (+) / White (−) / Brown jacket | Blue (+) / Red (−) / Blue jacket | −200 to 350°C |
| Type E (NiCr/CuNi) | Violet | White | Violet | Violet (+) / White (−) / Violet jacket | Purple (+) / Red (−) / Purple jacket | −40 to 900°C |
| Type N (NiCrSi/NiSi) | Pink | White | Pink | Pink (+) / White (−) / Pink jacket | Orange (+) / Red (−) / Orange jacket | −200 to 1300°C |
| Type R/S (Pt-Rh/Pt) | Orange | White | Orange | Orange (+) / White (−) / Orange jacket | Black (+) / Red (−) / Green jacket | 0 to 1600°C |
* IEC 60584-3 negative conductor is always White. ANSI/ISA MC96.1 negative conductor is always Red. Verify with cable datasheet before installation.
Analog Signal Cable (4-20mA / 0-10V)
| Conductor | Color | Swatch | Function |
|---|---|---|---|
| Signal + | Red / Brown | Positive signal conductor | |
| Signal − | Black / Blue | Negative / return conductor | |
| Shield / Drain | Bare / Green | Shield drain wire, connect at one end | |
| Supply (3-wire) | White / Yellow | Power supply (3-wire transmitters) |
Fieldbus & Digital Signal Cable
| Bus Type | Signal A (+) | Signal B (−) | Standard |
|---|---|---|---|
| PROFIBUS | Red | Green | IEC 61158 |
| Foundation Fieldbus | Red | Black | IEC 61158-2 |
| DeviceNet | White | Blue | IEC 62026-3 |
| CANbus | Yellow (H) | Green (L) | ISO 11898 |
| RS-485 | Red (A+) | Black (B−) | TIA-485-A |
Section 06
NEC vs. IEC: Side-by-Side Comparison
Direct comparison of North American (NEC/NFPA 70) and International (IEC 60446) color code conventions for the most common conductor types. Critical reference for global projects and cross-border engineering.
Three-Phase AC System Visual Comparison
Black
Phase A
Red
Phase B
Blue
Phase C
White
Neutral
Green
Ground
Note: 480V system uses Brown/Orange/Yellow for phases. NEC does not mandate phase colors for ungrounded conductors.
Brown
Phase L1
Black
Phase L2
Grey
Phase L3
Blue
Neutral
Grn/Yel
Earth
Adopted across EU, UK (post-2004), China, Australia, Southeast Asia, Middle East, and most international projects.
Master Comparison Table
| Conductor | NEC 208V | NEC 480V | IEC / EU | Old UK (pre-2004) | China GB | Australia AS/NZS |
|---|---|---|---|---|---|---|
| Phase L1 / A | Black | Brown | Brown | Red | Yellow | Red |
| Phase L2 / B | Red | Orange | Black | Yellow | Green | White |
| Phase L3 / C | Blue | Yellow | Grey | Blue | Red | Blue |
| Neutral (N) | White | Gray | Blue | Black | Light Blue | Blue |
| Ground / PE | Green | Green | Grn/Yel | Grn/Yel | Yel/Grn | Grn/Yel |
Section 07
Regional Wiring Standards Reference
Overview of applicable wiring standards by region. Jinda cables are manufactured and certified to meet the requirements of all major international standards.
United States
NEC / NFPA 70
- ·NEC (National Electrical Code) NFPA 70
- ·NEMA standards for equipment
- ·UL listing required for most applications
- ·Phase colors: Black/Red/Blue (208V), Brown/Orange/Yellow (480V)
- ·Neutral: White or Gray
- ·Ground: Green or bare copper
European Union
IEC 60446 / CENELEC HD 308
- ·IEC 60446 harmonized across all EU states
- ·HD 308 S2 (CENELEC harmonization document)
- ·CE marking required
- ·Phase: Brown / Black / Grey
- ·Neutral: Blue
- ·PE: Green/Yellow bicolor mandatory
United Kingdom
BS 7671 (IET Wiring Regs)
- ·BS 7671 (18th Edition IET Wiring Regulations)
- ·Harmonized with IEC 60446 since 2004
- ·Phase: Brown / Black / Grey (new)
- ·Old: Red / Yellow / Blue (pre-2004)
- ·Neutral: Blue (new) / Black (old)
- ·PE: Green/Yellow
China
GB/T 3956 / GB 50303
- ·GB/T 3956 (conductor standard)
- ·GB 50303 (building electrical installation)
- ·Largely aligned with IEC standards
- ·Phase: Yellow / Green / Red (L1/L2/L3)
- ·Neutral: Light Blue
- ·PE: Yellow/Green bicolor
Australia / New Zealand
AS/NZS 3000 (Wiring Rules)
- ·AS/NZS 3000:2018 Wiring Rules
- ·Harmonized with IEC 60446
- ·Phase: Red / White / Blue (3-phase)
- ·Single-phase: Red (active), Black (neutral)
- ·Neutral: Black (single-phase) / Blue (3-phase)
- ·Earth: Green/Yellow
Middle East / Southeast Asia / Africa
IEC / BS / Local Standards
- ·Most countries follow IEC 60446 or BS 7671
- ·Gulf states (UAE, KSA): BS 7671 widely used
- ·Southeast Asia: Mix of IEC and local codes
- ·Africa: Varies by colonial history (BS or NF)
- ·Always verify local authority requirements
- ·Project specifications may override local code
Key Standards Reference
| Standard | Full Title | Scope | Region |
|---|---|---|---|
| IEC 60446 | Basic and safety principles -- Identification of conductors by colours or alphanumerics | Conductor color identification | International |
| IEC 60757 | Code of colours for insulating materials | Color codes for insulation materials | International |
| NEC / NFPA 70 | National Electrical Code -- Articles 200, 210, 250, 310 | US electrical installation requirements | USA |
| BS 7671 | IET Wiring Regulations (18th Edition) | UK electrical installation standard | United Kingdom |
| IEC 60584-3 | Thermocouples -- Extension and compensating cables | Thermocouple cable colors | International |
| GB/T 3956 | Conductors of insulated cables (China National Standard) | Chinese conductor standard | China |
| AS/NZS 3000 | Wiring Rules (Australian/New Zealand Standard) | AU/NZ electrical installation | Australia / NZ |
| IEC 62548 | Photovoltaic (PV) arrays -- Design requirements | Solar PV DC wiring | International |
Jinda Cable -- Technical Support
Need cables manufactured to specific color code standards?
Jinda manufactures control cables, instrumentation cables, and power cables to NEC, IEC, BS, GB, and AS/NZS color code requirements. Custom color sequences available for OEM and project-specific orders. All cables are fully traceable with test reports and certificates.
- IEC 60446 / NEC compliant color coding
- Custom color sequences for multi-core cables
- Thermocouple extension cables (Type K/J/T/E/N/R/S)
- Full test reports and material certifications
- Export to 50+ countries with local standard compliance
- OEM/ODM manufacturing capability
Direct Technical Contact
No. 1377 Wode Avenue, Ping'an Subdistrict, Changqing District, Jinan City, Shandong Province, China