Nina Raemont/ZDNET Follow ZDNET:  Add us as a preferred source  on Google. ZDNET's key takeaways Heavy-duty appliances overload cords, leading to dangerous overheating and fire risks. Appliances over 1,800 watts need a dedicated wall outlet for safety. Daisy-chaining extension cords is a major fire hazard and should be avoided. While extension cords are a standard fix for reaching distant wall outlets, they aren't a universal solution for everything that plugs in. There is a critical distinction between low-power "electronics" and high-draw "appliances." Although items like refrigerators and toaster ovens are technically electronic, they operate on a different level in terms of amperage requirements. Because these appliances pull significantly more power to function, standard extension cords can quickly become a safety hazard rather than a simple convenience.…