Don't make these common extension lead mistakes – or you could put your home and appliances at risk
Convenient, flexible and space-saving, extension leads can be a game-changer if you find yourself running out of plug sockets on a daily basis.
But as practical as they are, extension leads are involved in many house fires across the UK, with 7,000 house fires caused by overloaded sockets and faulty electrical appliances each year, according to More Tips.
Electrical safety should be taken seriously in your home, which is why we've asked two experts about the extension lead mistakes to avoid.
1. Using an extension lead that's in bad condition
It might be tempting to reach for the same extension lead you've had in the cupboard for years, but it could increase the risk of electric shocks, electrical fires and damage to your devices if it's in poor condition.
"Check extension leads for signs of damage, including frayed and damaged cables, cracked casings, scorch marks or discolouration," says Paul Collins, Technical Integrity and Standards Director at NICEIC.
"If you notice a burning smell, unusual heat, buzzing or sparking, stop using the lead and disconnect it if it’s safe to do so. Never continue using damaged electrical equipment."
Featuring USB and USB-C ports and power surge protection, we recommend this tower extension lead, which is available in black and white.
2. Overloading the extension lead
Overloading your extension lead can cause electrical fires, damage to appliances and electric shocks. But how much is too much? Paul Collins says there isn't a set number of appliances that's safe for every extension lead.
“It depends on the lead’s maximum rating and how much electricity each connected appliance uses. Using several high-powered appliances on one extension lead can exceed its rating and cause it to overheat," he explains.
"Every extension lead has a maximum load it can safely carry – typically 13 amps, or around 3,000 watts. Plugging in multiple high-powered appliances can exceed this limit, causing the lead to overheat and potentially start a fire," adds Giuseppe Capanna, Product Safety Engineer at Electrical Safety First.
If you're unsure whether your appliances can be used together, always check their ratings and the manufacturer's guidance.
3. You 'daisy-chain' extension leads
Plugging one extension lead into another one (also known as 'daisy-chaining' might seem like a smart idea if you're short on plugs and cable length, but Paul Collins warns that it should always be avoided as it will increase the chances of overheating and fire.
“If you regularly need multiple extension leads to power equipment in the same area, consider contacting an NICEIC-registered electrician to install additional socket-outlets," adds Paul. "They can assess your existing electrical installation and advise on a safe, suitable solution."
4. You're plugging in unsuitable appliances
While extension leads can come in handy for things like phone chargers and table lamps, Guiseppe Capanna warns against plugging in appliances such as kettles, microwaves, dishwashers, washing machines and portable heaters. These should be plugged directly into a suitable wall socket instead.
"[These appliances] draw a large amount of power and may overload your extension lead," he explains.
If in doubt, it's always best to check with the appliance and extension lead manufacturer.
5. Buying them from an untrusted retailer
"Always buy extension leads from reputable retailers," advises Giuseppe Capanna.
Products from untrusted retailers may not meet the electrical safety requirements, which could again, increase the likelihood of overheating, electric shocks and electrical fires.
To find out whether an extension lead is safe to buy, keep an eye out for the following:
- Check if it has a UKCA or CE marking
- Check if the voltage or power rating is listed
- Check if a named manufacturer and address is provided
- Check for a 13A rating (this is standard)
- Check if it's fitted with a thermal cut-out
- Check they are fitted with a a standard UK 3-pin plug and a fuse
If you want to know about any recalls in the future, make sure you register your product.
FAQs
Do I have to buy a surge-protected extension lead?
No, you don't necessarily have to buy a surge-protected extension lead. While they can help protect your devices against voltage spikes, Giuseppe Capanna says they won't prevent overloading.
Can I plug in an extension lead overnight?
“An extension lead isn’t automatically unsafe simply because it’s plugged in overnight," explains Paul Collins. "However, it’s important to think about what is connected to it, whether those appliances need to remain powered and whether the equipment is in good condition.”
Extension leads are a staple in many households, but using them incorrectly can have serious consequences for both your home and appliances.
Want to know whether your living room electrics are up to the job? Our experts reveal all in this guide. Or, you may want to learn about the different types of plug sockets.
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