Tradefox Tools
Extension lead checker. Is that extension lead overloaded?
Add what you plan to plug into an extension lead, cable reel or adaptor. See the total load against its rating, and what to move to a wall socket.
Extension lead load checker
Cable reels often show two ratings: a lower one for when the cable is wound on the drum and a higher one for fully unwound. Use the one that matches how you are using it.
What's plugged in?
Tap to add. Wattages are typical figures; change them to match the rating plate on your appliance.
Nothing added yet.
Total load
0.0 A of 13 A
Before you plug in
- The rating is for the whole lead, not each socket. Four sockets on a 13 A lead share 13 A between them.
- Plug kettles, heaters, irons, washing machines and tumble dryers straight into a wall socket where you can.
- Never plug one extension lead or adaptor into another.
- Unwind cable reels fully before using anything powerful on them.
- Stop using a lead that feels hot, smells of burning, has scorch marks or a damaged cable.
Common questions
How many watts can a 13 A extension lead take?
On a 230 V supply, 13 A works out at about 2,990 W, so most guidance rounds it to 3,000 W. That limit is for everything on the lead added together.
How do I find an appliance's wattage?
Look for the rating plate or sticker, usually on the back or underside, or in the manual. It shows watts (W) or kilowatts (kW). If it only shows amps, multiply by 230 to get watts.
Why does it matter if something heats or has a motor?
Heaters, kettles, irons and dryers draw close to their full rating for long periods, which is what makes leads and plugs run hot. Motors such as saws and vacuum cleaners also draw a surge when they start.
Is a block adaptor safer than an extension lead?
No. A block or cube adaptor puts extra weight and strain on the wall socket, and some have no fuse. A fused extension lead on a cable is the better choice if you need more sockets.
Sources
- RoSPA: Don't overload, the 13 A or 3,000 W limit for extension leads.
- London Fire Brigade: cables, fuses and leads.
- Appliance wattages are typical figures written by Tradefox. Always use the rating plate on your own appliance.
Related: plug types and voltages around the world and electrical calculators.