Make sure all wires are properly insulated, and be sure to double check the wattage on each circuit before connecting anything. For instance, red, blue, green, orange, yellow and purple are often used to denote different types of secondary circuits.Īs important as it is to understand the meaning behind the colors, it is just as important to ensure that you follow all safety precautions when dealing with furnace wiring. Other colors could also be used and all of them serve different purposes. The white wire is usually connected to the main ground or neutral wire. The black wire is usually the live or hot wire as it carries the electrical current from the power source. The most common color code for wiring on a furnace is black and white. Knowing the color codes for different types of wires can help you properly install and maintain your furnace safely. Furnace wiring color codes may seem intimidating to the average homeowner, but they are actually quite easy to recognize.
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