In brief: Choosing the right extension lead depends on where you plan to use it. For indoor use, standard leads with a length of 3 m and a rating of 10-16 Ampere are often sufficient. For outdoor use or connecting powerful devices, you need robust CEE extension leads with the appropriate rated current and a thick, weather-resistant rubber sheath. Always make sure the plug type and required cable length are suitable.
Contents
An extension lead is a practical helper, but there is a wide range to choose from. Our 2026 test and comparison shows you what to look for. We compare different types and provide specific recommendations for your needs.
Which extension lead do I need?
The best way to answer this question is with three further questions. What will you use the lead for? Where will it be used? Which devices will you connect?
For occasional use at home, for example with a lamp or laptop, a simple lead with Schuko plugs is sufficient. An electrical installation professional, on the other hand, needs specialised solutions.
The right plug connection
Schuko plugs are standard in households. CEE plugs offer greater safety. They can be locked and are splash-proof. They are essential for powerful devices.
Conductor cross-section and current rating
The cross-section in mm² determines how much current the lead can safely carry. The thicker it is, the higher its load capacity. 1,5 mm² is sufficient for a drill. A welding machine requires more.
Tip: Check your device's rating plate. It shows the maximum power consumption in Watt. Divide this value by 230 (Volt). This gives you the approximate current consumption in Ampere. Choose a lead with a rated current above this value.
Key buying criteria at a glance
Compare extension leads based on these points. They determine safety and service life.
- Length: Too short is impractical, while too long can be dangerous. Long leads have a higher voltage drop.
- Rated current: 10A or 16A are typical for household leads. CEE leads are also available for 32A or more.
- Conductor cross-section: 1,5 mm² for standard loads. 2,5 mm² for high loads or long distances.
- Sheath material: PVC for indoor use, rubber cable such as H07RN-F for outdoor use and demanding applications.
- Ingress protection rating: IP44 means splash protection. This is important for outdoor use.
Comparison of the best extension leads
Our comparison includes models for various applications. The following table helps you compare their features directly.
The highest-rated extension leads in our range compared directly:
| Model | Customer rating | Availability |
|---|---|---|
| 10m extension lead, white | – | Currently unavailable |
| 3m extension lead, white | – | Currently unavailable |
| 5m extension lead, white | – | Currently unavailable |
| CEE extension lead 16A black - 50 m extension lead | – | Currently unavailable |
| CEE extension lead 230V, 25m, black | – | Currently unavailable |
For general household use, the is a solid choice. With a length of 5 m and Schuko plugs, it reaches many places in the room.
For heavy-duty work outdoors or on a building site, a robust CEE lead is essential. With a length of 50 m, the offers an enormous range for professional applications.
Models with special features are particularly practical. The features a phase inverter plug. This may be necessary for certain machines.
Applications and recommendations
We divide the possible applications into three categories. This makes it easier to find the right product from our extension lead range.
Home and office
Leads up to 10 m long with Schuko plugs are common here. Look for a spring-loaded strain relief at the plug. This extends the service life. Avoid running the lead under carpets.
Warning: Do not connect heaters such as radiators or kettles permanently via an extension lead. These devices draw a lot of power and can overload the lead, especially when combined with other appliances.
Garden and outdoors
In the garden, you need a lead with at least IP44 protection. Special garden tool leads in a bright, highly visible colour are even better. Always coil the lead after use.
Workshop and building site
This is where CEE connectors come into their own. They are impact-resistant and lockable. The lead should be made from robust rubber cable such as H07RN-F. A cross-section of 2,5 mm² is recommended for many machines.
Note: Building sites are often subject to stricter regulations. Find out about the applicable accident prevention regulations (UVV) issued by the German Social Accident Insurance. These sometimes specify particular cable and plug types.
Safety Comes First
Electricity is not without its risks. Always follow these safety rules.
- Check the cable for damage before every use. Cracks, crushed sections or exposed wires are warning signs.
- Only use cables approved for outdoor use outside.
- Always pull the plug out by the plug itself, never by the cable.
- Do not leave the cable lying in puddles. Even with IP44 protection, this is not a long-term solution.
Find out more about this topic in our Technology section.
Care and Storage
Proper care helps protect your cable. After using it outdoors, clean it with a dry cloth. Coil it loosely onto a cable reel or lay it in large loops.
Avoid tight knots or sharp bends. They can damage the internal conductors. Store the cable in a dry place protected from direct sunlight.
Conclusion
Choosing the ideal extension lead involves balancing the intended use, safety and convenience. Standard models are often sufficient for household use. However, as soon as you move outdoors or into a professional environment, robust CEE cables with the appropriate protection rating become essential.
Our comparison shows that there is no one-size-fits-all solution. Take your appliances' maximum load and the environmental conditions into account. Invest in quality, because when it comes to electrical cables, safety is not something to compromise on. With the right choice, you can enjoy a reliable helper for a long time.
Frequently Asked Questions
- What length should an extension lead for the garden be?
- The right length depends on your needs. Measure the distance from the socket to the furthest point where you will use it. Allow some extra length, but avoid excessively long cables, as voltage drops in very long cables can affect appliance performance. For medium-sized gardens, 25 to 30 metres is often sufficient.
- What is the difference between a household socket and a CEE socket?
- Household sockets (Schuko) are designed for a maximum of 16 amps and everyday appliances. CEE sockets (often blue for 230V/16A and red for 400V) are industrial connectors. They are more robust, splash-proof and lockable, making them ideal for outdoor use, building sites or powerful equipment such as welding inverters.
- Can I install an extension lead permanently?
- No. Extension leads are intended for temporary use. Permanent installation increases the risk of damage, overloading and tripping hazards. For fixed installations, you should hire an electrician to install permanent wiring and suitable flush-mounted or surface-mounted sockets.
- What does H07RN-F mean on a cable?
- This designation refers to an especially robust rubber cable. It is oil-resistant, weatherproof, flexible in cold temperatures and abrasion-resistant. These cables are designed for heavy-duty use outdoors, in workshops or on building sites and offer significantly more protection than standard PVC cables.
- Can I connect multiple extension leads together?
- We strongly advise against it. Connecting several cables in series increases the contact resistance and the risk of heat building up at the plug connections. Voltage drop also accumulates over the total length, which can damage your connected appliances. It is better to use a single cable of the required overall length.