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How to use a socket cube: the one shared 13 A path

Updated: 23 October 2026

You are about to load a cube, or one you own already feels warm at the pins. How to use a socket cube is one limit: the cube and the wall socket are a single 13 A path. Add the plates, keep the sum inside that path, and unplug at the wall if you smell hot plastic. This page does not rank the ten listings in the [socket cube comparison](/hub/sockets-and-extension-leads/socket-cube). Peter F., editor for DIY & tools, did not lab-test them. Figures come from Electrical Safety First, Which?, and London Fire Brigade, read on 21 October 2026. A qualifying purchase can earn a commission at no extra cost to you.

You are about to load a cube, or one you own already feels warm at the pins. How to use a socket cube is one limit: the cube and the wall socket are a single 13 A path.

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Masterplug Masterplug MSWRG3-MP

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Masterplug Masterplug MSWRG3-MP
8.9/10about £8.25
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NAEEM SONS NAEEM SONS cube

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NAEEM SONS NAEEM SONS cube
8.7/10about £4.30
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Status Status 1.4 m cube

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Status Status 1.4 m cube
7.5/10about £13.98
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On this page
  1. 1.The cube and the wall share 13 A
  2. 2.Kettle, toaster, heater
  3. 3.How to plug it in
  4. 4.If it gets hot
  5. 5.Bathroom and a new socket

The cube and the wall share 13 A

Count the plates, not the faces. Electrical Safety First marks a kettle at up to 13 A, typically 2,200–3,000 W, a four-slice toaster near 9 A or about 2,000 W, and a hair dryer near 10 A or about 2,200 W. Which?, quoting Tim Benham of Royal Berkshire Fire and Rescue, stops at more than 3,000 W on one socket. At about 230 V, 13 A is roughly 3,000 W. A bullet of 3,250 W, on LENCENT and Chemilen, is 13 A times 250 V, still once. If the plates pass 3,000 W, that pair does not belong on the cube. The fuse opens after an overload. It is not a target to sit on every evening.

Kettle, toaster, heater

A kettle at the top of that table can take the socket alone. A toaster near 2,000 W beside it puts the plates at or over the 3,000 W line before a charger is added. London Fire Brigade would rather those appliances did not share, and would rather see a fused lead than a plug-in cube. That is their advice. The product choice is on socket cube vs extension lead. The ordinary cube load here is a lamp, a router, a radio and a phone charger. Give the kettle the wall and put the lamp on the cube.
Masterplug Masterplug MSWRG3-MP

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Masterplug Masterplug MSWRG3-MP
8.9/10about £8.25
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How to plug it in

Seat the cube until the pins are home, then one plug per face. Electrical Safety First says one device per socket, and no daisy-chain. Do not plug the cube into a lead, or a second adaptor into the cube. Which? records the failure: plug weight pulls the block out, the contact worsens, and the pins heat. Aodeng reviews say the body sticks out more than 3 inches, about 4.5 inches with a plug, and one unit leaned out until it lost contact. If you can see the pins, take it out. USB limits are on socket cube with USB. They do not raise the 13 A path.

If it gets hot

A hot-plastic smell, a scorch, a blown fuse, or pins you cannot touch means stop. Switch off at the wall, pull the cube out once you can hold it, and leave it out. Do not refit the fuse and try the same load. A JSVER unit melted two fuses and smelt burnt within about three months, USB unused. FAMHOME reviews describe a prong that burnt a hand. Masterplug reviews say the switches get hot, including on a phone charger. A warm switch and a melted body are both stops. A discoloured wall socket needs a registered electrician. What the listing should have named is on the socket cube buying guide.

Bathroom and a new socket

No cube here prints an IP rating. A LENCENT bullet names a bathroom. That word is not a zone rating. The IET expects 13 A sockets at least 3 m from zone 1. NICEIC’s householder page uses 2.5 m from the bath or shower edge. This page will not blend those into a third distance. If every socket already holds a cube or a lead, Electrical Safety First says fit more wall sockets. In England and Wales that work sits under Part P when it is notifiable. A cube can stay for a lamp and a charger on a dry wall. A kettle plus another hungry appliance is the end of the cube’s job.

Common questions

Can I run a kettle and a toaster from one cube?
You should not. A kettle is up to 13 A, typically 2,200–3,000 W, and a four-slice toaster is near 2,000 W, on the Electrical Safety First table. Which? quotes a line at more than 3,000 W on one socket. Together those plates are already there. Give the kettle the wall.
Can I plug the cube into an extension lead?
No. Electrical Safety First says one extension device per socket. A cube on a lead shares one 13 A plug and adds weight that loosens the pins. LENCENT reviews call that cube awkward on a lead. For reach, use a lead alone, or the Status 1.4 m cable if that is enough, and keep kettles off the stack.
What do I do if it gets hot or smells?
Unplug at the wall and leave it out. Smell, scorch, a blown fuse, or pins that burn are stops. Do not fit a new fuse and retry. JSVER reviews describe melting. FAMHOME reviews describe a prong hot enough to burn. A browned wall socket needs an electrician.
Can I use it in a bathroom if the listing says bathroom?
LENCENT names a bathroom and prints no IP rating. Neither does any other row. The IET figure is at least 3 m from zone 1. NICEIC uses 2.5 m from the bath or shower. Keep the cube out. Bathroom socket work in England and Wales is for a registered electrician under Part P when it is notifiable.
When do I stop and ask for another wall socket?
Ask when the room only works on cubes and leads, or when the kettle needs its own socket. Electrical Safety First points to more wall sockets then. A lamp and a router, well under 13 A, can stay on one cube. A new socket is Part P work for an electrician when it is notifiable. Leave a hot adaptor out.

Related pages

Best socket cube

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Socket cube buying guide: fuse, pins and real outlets

Socket cube vs extension lead: wall holes or reach

Socket cube with USB: about 12 W, not a 65 W brick

Sources

Sources taken from the research digest. Listings were scored from stored amazon.co.uk rows. This page did not run a lab test.

  1. Electrical Safety First — block adaptors (retrieved 22.10.2026)
  2. Electrical Safety First — appliance ratings (retrieved 22.10.2026)
  3. Electrical Safety First — plugs and fuses (retrieved 22.10.2026)
  4. Plugs and Sockets etc. (Safety) Regulations 1994 (retrieved 22.10.2026)
  5. BSI, BS 1363-3:2023 (retrieved 22.10.2026)
  6. IET Wiring Matters — BS 7671 FAQ (retrieved 22.10.2026)
  7. NICEIC — bathrooms and electrics (retrieved 22.10.2026)