Live (L) is the hot conductor and Neutral (N) is the return path. The color used to identify L and N varies by country and installation era. In modern European and many Commonwealth systems, L is brown and N is blue; in the United States and Canada, L is typically black (or red on some 240 V circuits) and N is white. The United Kingdom has both old red/black wiring and newer brown/blue wiring; Australia and New Zealand follow brown for L and blue for N in the latest standards, with red/black used in older installations.
Global color standards for L and N
Below is a concise guide to the most common color assignments for live and neutral wires around the world. Remember that regional codes may differ and individual installations can deviate from these norms.
- United States and Canada: L = black (hot) or red on a second live conductor; N = white; Ground = green or bare copper.
- European Union and many other countries: L = brown; N = blue; Ground = green-yellow.
- United Kingdom (older wiring): L = red; N = black; Earth = green-yellow.
- United Kingdom and Australia/New Zealand (current practice): L = brown; N = blue; Earth = green-yellow.
- Notes: Some regions still use non-standard colors or multi-core cables with sleeves; always verify using local codes and testing if in doubt.
In practice, color is a guide, not a guarantee. If you encounter unfamiliar wiring or missing color coding, do not assume; test with appropriate equipment and consult a qualified electrician.
Regional nuances
Regional nuance: The transition from old to new color schemes has happened at different times in different countries. For example, the UK started adopting brown/blue in the late 2000s, while Australia shifted from red/black to brown/blue over time. In some legacy installations, multiple colors may be used on the same circuit. Always check the circuit’s documentation and use measurement tools to confirm before any work.
Safety and verification when color codes are unclear
When color codes are unclear or the wiring is unfamiliar, follow safety-first steps to confirm which conductor is live and which is neutral. The aim is to identify L and N without exposing yourself to electrical hazards.
- Turn off power at the breaker or main switch before inspecting or handling wiring.
- Use a non-contact voltage tester or digital multimeter with appropriate probes to identify which conductor is live. Only perform testing if you are trained and comfortable with the procedure.
- Label or secure any wiring you identify and consult the electrical code or a licensed electrician for any wiring changes.
Relying on color alone can be risky; international and local codes may differ, and some installers may repurpose wires or mislabel cables. Verification by a professional ensures compliance and safety.
Summary
Color-coding for L and N depends on regional standards and historical practice. Modern European and many Commonwealth systems typically use brown for L and blue for N, while the US and Canada often use black or red for L and white for N. The UK has both old red/black and new brown/blue schemes. Always verify with local electrical codes and use testing equipment or a licensed electrician when in doubt.
What color goes to L and N?
Single-phase system: The following wiring color codes for a single-phase system are as follows: Phase or Line (L) = Brown. Neutral (N) = Light Blue. Protective Earth (PE) conductor = Green with Yellow stripe.
Does L or N go to black wire?
L = Live (hot), N = Neutral, E = Earth (ground) — IEC labels found on imported fixtures, appliances, and smart home equipment. In U.S. residential wiring: connect black to L, white to N, and green or bare to E.
Which color wire is n and l?
US AC power circuit wiring color codes
| Function | label | Color, common |
|---|---|---|
| Neutral | N | white |
| Line, single phase | L | black or red (2nd hot) |
| Line, 3-phase | L1 | black |
| Line, 3-phase | L2 | red |
Which wire goes into L and N?
What colour wire goes to L & N? In new, single-phase electrical circuits in the UK, the live (L) wire is brown, and the neutral (N) wire is blue. The earth wire is green and yellow. Some circuits, such as three-phase circuits, feature wires with different colours.