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A UK 13A socket is rated for 13 amps—about 3,000 watts at nominal 230V. The exact calculation is 13 × 230 = 2,990W, so 3,000W is a rounded guide, not a guarantee that every circuit, extension lead or older installation can safely supply that much.
How many watts can a 13A socket handle?
For a simple estimate at nominal 230V, multiply amps by volts to estimate watts, or divide watts by 230 to estimate amps. A 2,000W appliance draws about 8.7A; 13A corresponds to 2,990W. Electrical Safety First describes 3,000W as the maximum rating of a wall socket (Electrical Safety First: Overloading Sockets).
These calculations are a guide to the electrical load only. They do not assess the condition of the wiring, circuit, socket contacts or installation. Follow the lowest rating marked on any socket accessory, extension lead, cable reel or appliance, and its manufacturer’s instructions.
Can you run two appliances from one socket?
It depends on their combined load and the ratings of everything supplying them. Add the wattage of appliances running at the same time, or estimate their combined current by dividing the total watts by 230. If an extension lead or adapter is involved, its rating may be lower than the wall socket’s; that lower rating is the one to observe.
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Electrical Safety First says most extension leads are rated at 13A, but some older leads and many cable reels may be rated at 10A or less. Never plug one extension lead into another: this can cause the wall socket to overheat. More outlets do not create more supply capacity.
What changes when you use a cable reel?
Check the reel’s marked rating and instructions. Electrical Safety First says a cable reel’s current rating is typically as low as 3A or 4A when the cable is wound. If you need its full rating, fully unwind the cable; do not assume the wound rating is the same as the unwound rating.
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What does the plug fuse protect?
The fuse in a UK plug is a safety device: it can blow if the appliance or lead draws excessive current because of an overload or fault, helping prevent overheating and fire. It does not increase the socket’s capacity. Electrical Safety First says a standard UK plug is usually fitted with a 3A or 13A fuse and gives 700–3,000W as general guidance for appliances using a 13A fuse. Replace a fuse only with one of the same rating (Electrical Safety First: Overloading Sockets).
The 13A rating sits within the UK plug-and-socket standards system. The British Standards Institution says the BS 1363 series covers safety, construction, dimensional accuracy, testing and marking. Its current edition for 13A switched and unswitched shuttered socket-outlets is BS 1363-2:2023, published on 30 June 2023 (BSI: BS 1363-2:2023).
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What warning signs mean you should stop using a socket?
Stop using the outlet and unplug the appliance if you notice heat, burn marks, buzzing or crackling, a blown fuse, or a circuit-breaker that trips. Contact the retailer, manufacturer or a qualified repair technician rather than continuing to use equipment that shows these signs. Electrical Safety First also explains that an RCD helps protect against electric shock from a faulty product; it does not raise the socket’s load limit (Electrical Safety First: Overloading Sockets).
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Can you replace a single socket with a double?
Not necessarily. Whether a single socket can be replaced with a double depends on the installation. Electrical Safety First says an electrician should assess the load, circuit type and cable rating before such a change. A plug-in power meter can show an appliance’s draw, but it cannot inspect wiring or establish that the installation is safe (Electrical Safety First: Overloading Sockets).
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