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If you live in the Bangalore and your home was built after the 2000s (or your outdated wiring has since been updated), you can expect the electrical wires behind your walls to follow certain colour standards. What the Colour of Electrical Wires Means for You. Specific colours identify each wire’s function in a circuit. Learning what these colour codes are before attempting any type of do-it-yourself (DIY) electrical system repairs is critical.

Just remember, all electrical wires could carry a current at some point, so treat each colour with equal caution. If you have any hesitations at all, it’s best to leave electrical work to a qualified professional.

Black Electrical Wires

This colour of wire is used as neutral in the main circuit with the heavy gauge i.e. 4sq and also used to transfer the phase power through switches with the small gauge i.e. 1.5sq or 1sq

Red or Blue Electrical Wires

In 220-volt circuits, red wire`s are used for main phase supply and directly connected to the switches or DPs to supply the current to the loads

Yellow Electrical Wires

While wires in these colours carry power, they are not used in typical outlet wiring. Instead, yellow wires are used as the live wires pulled through a conduit. For example, you might see yellow wires as switch legs to ceiling fans, structural lights and outlets paired with light switches.

White and Grey Electrical Wires

If you find wires in either of these colours, you’ve located the neutral wires. White is most commonly used, but grey wires serve the same function. The purpose of a neutral wire is to connect to the neutral bus bar, a conductive piece of metal within an electrical panel that attracts the electric current for distribution throughout the house. White and grey electrical wires can only be connected to one another. While they’re called “neutral” wires, they may still carry a current, especially if the load is unbalanced, so handle them cautiously.

Green Electrical Wires

The purpose of green wires is to ground an electrical circuit. They connect to the grounding terminal in an outlet box and run to the ground bus bar in an electrical panel. In this way, green wires act as a failsafe, giving electricity a place to escape into the ground if a live wire within the circuit touches metal or something else conductive. Green wires can only connect to other green wires. Remember, if there’s a fault somewhere in your circuit, green wires could be live, so treat them with caution.

With this wire colour code guide, you have a better idea of what wires accomplish which tasks. You may feel comfortable completing simple electrical upgrades yourself, but the service professionals at OFT.Electricals® can handle the job for you.


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