Many EV drivers sooner or later find themselves in a situation where their standard charging cable is just a little too short. The solution seems simple: just attach an extension cord. But this is where things often go wrong. Extending charging cables is not without risks, and in some situations even legally prohibited.
In this article you will discover:
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How to safely extend a charging cable
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When it well and not allowed by law
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Which cables, adapters, and protection you need
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What you absolutely must avoid
Fully checked against current Dutch regulations and EV safety standards.
Are you allowed to simply extend a charging cable?
No, not always. According to Dutch legislation and NEN standards, strict requirements apply to electrical connections for EV charging. For example, it is forbidden to use a household extension cord or hardware store cable between your charging point and your car.
Permitted and safe extension is only allowed if:
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The extension cable is specially designed for EV charging.
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The cable is equipped with the correct fuse, earth leakage protection, and thermal control.
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The connection is watertight and CE-certified
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The total charging current remains below the safe limit (16A or 32A, depending on type)
View all approved EV extension cables here
Common (dangerous) mistakes
1. “I just use a 10-meter outdoor extension cord.”
➡️ ❌ Not allowed and life-threatening. These are not designed for constant current and can overheat.
2. “I am extending the cable between my car and the charging station.”
➡️ ❌ A fixed charging station (public or home) communicates with the car via a data stream. If you interrupt the cable, does this no longer work properly and damage may occur.
3. “I use an adapter from CEE to Schuko.”
➡️ ⚠️ Only permitted if the charger is specifically designed to safely charge both types, with sufficient protection.
In which situations should you extend?
| Situation | Solution |
|---|---|
| You only have Schuko (230V) available | EV extension cable with protection and thermal control |
| You are far from the power outlet (campsite) | EV-approved extension cable of 5–10 meters |
| You are using a CEE connection | CEE extension cable with correct connection rating (16A/32A) |
| You charge via a mobile home charger | Use an EV extension cable between the CEE connector and the charger. |
View camping-ready solutions here
What requirements must a safe extension cable meet?
A legally permitted EV extension cable has:
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Minimum 2.5 mm² copper thickness
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CE certification and preferably TÜV certified
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Protected connectors (IP44 or higher)
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Residual current device or DC fault detection
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Plugs of the correct type (Type 2, CEE 16A, Schuko, etc.)
NB: No cable must become warm during normal use. If the cable gets hot, stop immediately and replace it.
What is the maximum length an extension cable can be?
The maximum length depends on:
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The current (16A, 32A)
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The copper thickness of the cable
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Voltage loss over long distances
Rule of thumb:
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Maximum 10 meters at 16A (provided 2.5 mm²)
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Maximum of 5 meters at 32A (provided it is 6 mm²)
It can be longer, but only if the cable is professionally designed with sufficient cooling and thickness.
Alternative: mobile charger with longer cable
Sometimes extending is not the smartest solution. mobile charger with integrated 10-meter cable is safer, more practical, and immediately meets all requirements.
Bar2Charge supplies various models with:
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CEE 16A or 32A plug
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Type 2 connection
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Thermal protection
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IP65 splash-proof rating
👉 View our mobile chargers with extra-long cables here. >
Summary: safely renewing = loading well-prepared
Extending charging cables is possible. But only if you do it safely, legally, and in a technically responsible manner. Never use standard household cables or hardware store cords.
Choose:
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EV-approved extension cables
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Mobile chargers with sufficient cable
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Correct CEE adapters per connection
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Protection against overload and leakage current
This way, you avoid dangerous situations and fines if the insurance company checks afterwards.
Frequently Asked Questions
May I extend my charging cable with an extra Type 2 cable?
No, that is prohibited at fixed charging stations and often does not work technically due to the lack of signal transmission.
How do I know if my cable is safe?
Check if it is CE-approved, has a minimum copper thickness of 2.5 mm², is IP44 or higher, and includes thermal protection.
What is the difference between a charging cable and an extension cable?
A charging cable connects the charging station to the car; an EV extension cable connects the power source to the portable charger. Both have different requirements.
Want to know more or receive personal advice?
Not sure what you need? Send us a photo of your connection and car. Our EV specialists will help you immediately with the right product, without any technical hassle.