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Maximum load of a extension lead

When several electrical devices are connected to one extension lead, their combined power consumption must remain within the maximum electrical load specified for that extension lead. Exceeding the permitted load can cause the plug, cable or extension lead to become excessively hot and increase the risk of damage or fire.

The maximum load can differ between extension leads. For this reason, always check the product specification, rating plate or manufacturer's instructions rather than assuming that every extension lead can handle the same electrical load.

How many watts can an extension lead handle?

There is no single wattage that applies to every extension lead. The permitted maximum load depends on the electrical rating of the individual product.

Extension leads are marked with information such as their rated current, voltage and maximum electrical load. Before connecting several devices, check these specifications and make sure that the combined load of all devices used at the same time remains below the stated maximum.

This is particularly important because an extension lead with more sockets does not automatically have a higher electrical capacity. A 10-way extension lead, for example, may provide more connection points than a 4-way model, but the maximum total load still depends on the specification of the individual product.

How do I calculate the load on an extension lead?

The simplest method is to check the power consumption in watts of each device you want to use and add the values together.

Example:

  • Device 1: 500 W
  • Device 2: 300 W
  • Device 3: 100 W

The combined load is therefore:

500 W + 300 W + 100 W = 900 W

You can then compare this total with the maximum electrical load stated for the extension lead.

If electrical power is not given directly in watts, it can also be calculated using current and voltage:

Current (A) × Voltage (V) = Power (W)

For everyday use, however, the wattage shown on the appliance or in its operating instructions is usually the easiest value to use.

Can I use every socket on an extension lead?

Using every available socket does not automatically mean that the extension lead is overloaded. What matters is the combined electrical load of all devices operating at the same time.

Several low-power devices may remain well below the permitted maximum load, while only a few high-powered appliances can approach or exceed it.

This is why the number of connected devices alone is not a reliable way to determine whether an extension lead is being used safely.

Can an extension lead become overloaded?

Yes. An extension lead can be overloaded when the combined electrical load of the connected equipment exceeds the rating specified for the product.

An overloaded or damaged extension lead may become unusually warm. Warning signs such as excessive heat, discolouration, a burning smell, buzzing or crackling noises should not be ignored. If any of these signs occur, disconnect the extension lead from the mains and stop using it.

What should I consider with high-powered appliances?

Appliances with a high power demand can use a large proportion of an extension lead's permitted load on their own. When using such equipment, always check both the appliance manufacturer's instructions and the electrical rating of the extension lead.

If the appliance manufacturer specifies that the product should be connected directly to a wall socket, this instruction should be followed.

When several appliances are connected to one extension lead, their loads must always be added together rather than considered separately.

Does a 6-way or 10-way extension lead have a higher maximum load?

Not necessarily. The number of sockets describes how many devices can physically be connected, but it does not determine the maximum amount of electrical power the extension lead can safely carry.

Always use the maximum electrical load specified for the individual product as the deciding value.

Can I connect two extension leads together to increase the number of sockets?

No. Connecting one extension lead to another does not increase the available electrical capacity and can create additional connections where overheating may occur.

Why extension leads should not be connected one after another is explained in Why you should not connect several extension leads together.

How can I use an extension lead safely?

  • Check the maximum electrical load stated for the individual extension lead.
  • Add together the power consumption of devices that will operate at the same time.
  • Do not exceed the product's stated electrical rating.
  • Follow the operating instructions of the connected appliances.
  • Do not use an extension lead if the plug, cable, housing or sockets are damaged.
  • Stop using the product if it becomes unusually hot or shows other signs of damage.
  • Do not connect several extension leads one after another.

Choosing the right extension lead and staying within its specified maximum load helps ensure that several devices can be supplied with power safely.