14 October 2026, 02:08 PM
Red, black, blue or green? How to use colours in house wire wiring safely, and why house wire manufacturers in India stress consistent coding.
Ask three electricians which colour is the live wire and you may get three answers. Older homes in India often used red for live, black for neutral and green for earth. Newer products and installations sometimes follow international colours. This guide explains why the exact colour matters less than one thing: using the same coding everywhere. It is a point house wire manufacturers in India often hear from customers after a wiring job goes wrong.
Why colours exist
Colours let anyone opening a switch box tell at a glance which wire does what. An electrician repairing a socket years later, who did not install it, depends on that code. When colours are mixed, assumptions kill.
What is commonly seen
Rules worth following
Cheap or poorly stored insulation can discolour with heat or sunlight, making two colours hard to tell apart. A good manufacturer chooses colourants that stay distinct over time. At the shop, look at the coil in good light and compare the shade across the whole length.
Check the print as well
Along with colour, a wire should carry the maker's name, the size and the voltage rating, printed legibly at regular intervals. If the print rubs off with a thumb, the quality of the rest of the product is also open to question.
A small test before you pay
Hold two coils of the same colour side by side. Look at consistency of shade, finish and printing. Then ask for the data sheet. A manufacturer such as Botsoncab lists specifications on its TDS page and describes its range of LT flexible and cord cables, which helps you compare properly.
When you rewire
If you are adding to an old house, check what colours the existing wiring uses before you add new wire. Matching old practice, even if it is not the latest convention, avoids a house where two systems coexist unlabelled.
Quick checklist
General information only. Follow your electrician's instructions and local rules for colour coding.
Ask three electricians which colour is the live wire and you may get three answers. Older homes in India often used red for live, black for neutral and green for earth. Newer products and installations sometimes follow international colours. This guide explains why the exact colour matters less than one thing: using the same coding everywhere. It is a point house wire manufacturers in India often hear from customers after a wiring job goes wrong.
Why colours exist
Colours let anyone opening a switch box tell at a glance which wire does what. An electrician repairing a socket years later, who did not install it, depends on that code. When colours are mixed, assumptions kill.
What is commonly seen
- Live (phase): often red, with other colours used for the other phases in three-phase homes
- Neutral: commonly black or blue
- Earth: green or green with a yellow stripe
Rules worth following
- Never use green or green-yellow for anything but earth. That colour tells the next person it is safe to touch in a fault. A live wire disguised as earth is dangerous.
- Keep the same colour for the same job in every room. Switching conventions between floors confuses everyone.
- Switch the live, not the neutral. In a lighting circuit, the switch should break the live wire.
- Use tape to mark exceptions. If you must use a wire of one colour for another job, mark both ends with coloured tape, and record it.
- Label the distribution board. Every circuit breaker should show which room or load it controls.
Cheap or poorly stored insulation can discolour with heat or sunlight, making two colours hard to tell apart. A good manufacturer chooses colourants that stay distinct over time. At the shop, look at the coil in good light and compare the shade across the whole length.
Check the print as well
Along with colour, a wire should carry the maker's name, the size and the voltage rating, printed legibly at regular intervals. If the print rubs off with a thumb, the quality of the rest of the product is also open to question.
A small test before you pay
Hold two coils of the same colour side by side. Look at consistency of shade, finish and printing. Then ask for the data sheet. A manufacturer such as Botsoncab lists specifications on its TDS page and describes its range of LT flexible and cord cables, which helps you compare properly.
When you rewire
If you are adding to an old house, check what colours the existing wiring uses before you add new wire. Matching old practice, even if it is not the latest convention, avoids a house where two systems coexist unlabelled.
Quick checklist
- One coding scheme for the whole house
- Earth colour reserved for earth
- Tape and labels where anything is unusual
- Legible print on the wire
- A written record in the distribution board
General information only. Follow your electrician's instructions and local rules for colour coding.