As summer approaches, more of us rely on fans, , and other household gadgets to keep cool and comfortable, but plugging them into an extension cord could be a disaster waiting to happen. According to Robert Andrews, an electrical expert from , many everyday appliances - including hairdryers - are putting UK households at risk simply because they're being used with the wrong type of socket.

"Extension leads are incredibly convenient, but they're not designed to handle high-powered appliances," warns Mr Andrews. "Using them incorrectly can overload the circuit, create dangerous levels of heat, and even cause house fires." According to the electrical expert these are the that he would never plug into an extension cord.

Hair dryers and straighteners are two items that Mr Roberts would avoid using with an extension lead. While some can handle them, not all of them can, which poses a great fire risk. A hair dryer can use over 1800 watts, which is a lot for a multi-socket extension lead to handle safely, the expert says.

"If several appliances are running through one extension, the wiring may overheat and melt without you realising, which is a serious fire hazard, especially in bedrooms or bathrooms," Mr Andrews adds.

Kettles and coffee machines are a staple in the kitchen, but they are two other items which should never be plugged into extension cords, especially during a busy morning routine.

Mr Andrews says: "Kettles can draw up to 3000 watts, which is far too much for an extension lead to safely handle. If your cord isn't rated for high wattage, it can quickly overheat, and as most kettles are placed next to the sink, it can be an accident waiting to happen."

Fans are an effective appliance to keep us cool in the Summer, but according to the expert, plugging one into an extension lead could have serious consequences.

As they are left running for hours at a time, that constant draw on an overloaded extension cord can cause it to heat up gradually, the expert explains. Air purifiers and dehumidifiers should not be plugged into extension cords for the same reason.

"The big worry is that this often happens when we are asleep, and this could be deadly," he adds. "With heaters, the danger is ramped up, and many fires are started this way.

Vacuum cleaners, especially older models, can trip fuses when plugged into an extension lead. While they are often only used in short bursts, the energy usage can be dangerously high. "Never use your vacuum with an extension lead," warns Mr Andrews.