Old Light Wiring Colours

By | May 20, 2015



Unravelling The Mystery Of Old Light Wiring Colours



When the new homeowner is suddenly faced with the reality of replacing an old ceiling fan, or troubleshooting an existing setup, the mystifying world of old electrical wiring colours can be intimidating. From sussing out which wire goes where, to understanding what kind of current is being measured, it's important to be familiar with the old light wiring colour codes to ensure a safe and successful electrical repair.



Older wiring systems often had different coloured wires in them compared to their modern counterparts, and the North American standard used three primary colours: black, white, and green. Although the use of these colours has changed over time, it's important to have a basic understanding of the old wiring system to diagnose a faulty light switch, or circuit breaker.



The Old Black and White Wiring System



The earliest electrical wiring systems employed by North American citizens were predominantly black and white. This means that the neutral, or ground, wire was typically black, while the hot wire was white. Older fixtures and outlets would be wired this way, as would newer ones if they had been fashioned out of spare parts.



In this system, the ground wire was usually bonded to the frame, so if it had become disconnected, it wouldn't become “hot” and cause a shock hazard.



Green Has Come to Mean Safety



The green wire became associated with safety on all electrical systems during the 1940's, as it served as the connection point for earth ground. This is why all electrical boxes, outlets and receptacles have a visible green grounding screw located right next to them.



It's also the reason why craftsmen wire their homes and shops with a separate ground system. Even though it may look like the green wire is no longer necessary, it still serves as the contact point for the safety device in case of a breakdown.



The Evolution of Electrical Wiring Colours



As technology advances, the use of different colours for wiring systems continues to change. Modern wiring installations now use a blend of white, black, blue, and red, which allows electricians to easily identify the different circuits. In addition, some states and municipalities are now requiring the use of tamper-resistant outlets, which have special clips built in to prevent shocks.



Newer wiring systems also use different voltages, allowing the homeowner to install higher wattage appliances without the worry of overloading the circuit.



Remaining Safe and Informed



Knowing the basics of the old wiring colour codes can help homeowners and electricians alike to quickly identify and fix electrical problems with ease. By understanding what each colour means, consumers can take the necessary precautions to protect themselves from shocks, as well as any possible fires or other hazards.



It's important to always hire a qualified electrician when undertaking any electrical work, but if you're curious about the wiring colours in your own home, it's never a bad idea to educate yourself on the basics.


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