Can you extend an EV charging cable
Electric Car Charging

Can You Extend an EV Charging Cable?

Did you know that rising sales of electric vehicles are one of the most important trends in the automotive industry today? On a global scale, 2.3 million battery-powered vehicles found their buyers in 2020 only. This is four times more than it was just several years ago. However, charging infrastructure is still not at par with the level of technology introduced in these vehicles.  Without a doubt, this is the biggest barrier to their widespread adoption. Most people prefer to charge their vehicle at home using a charging cable. Still, some of them face various problems when using a domestic charger, with whether they can extend an ev charging cable is one of them. And if this is possible, could it have any negative side effects or lead to dangerous situations? In this article, we will explore what kind of charging cables are there and find out how to extend them.

How to extend an EV charging cable?

The easiest method is to use extension cords, which come in different lengths and specifications. Besides being the simplest, this solution is also the safest way to go. The extension cable connects to the male connector at one end and the female one at another side. This makes the connection with the stock charger quite easy. There are several charging extension sockets available for Tesla and other EVs, each of them having a certain power rating. It is crucial to have a cable with an appropriate power rating and circuit breakers that can that sort of power. Another important thing that should be kept in mind is that charging cables themselves cannot be used as extension cables. In other words, charging cables cannot be chained together to form a larger cable as they don’t form a tight connection which leads to a compromised connection.

Here at EV Cable Shop, we have a range of Type 2 to Type 2 extension cables. These include 5m, 10m, and 15m options.

Can you extend a 3-pin charging?

Another possible method utilizes a standard three-pin charging cable. Many owners know it as a slow charger since it charges the car at a pace that is not that quick. Although this has certain risks associated with it, they are not as significant as when using a faster domestic charger. This is because the voltage is not as high and charging speeds are quite low. However, this does not in any way mean that you should be reckless when using an extension cord with a 3-pin charging cable. Just like with any other electrical device, unsafe usage can lead to potentially dangerous situations and life-threatening hazards.

Can a tethered charging cable be extended?

As mentioned earlier, there are numerous ways of charging an electric car at home. Some wall box chargers use tethered charging cables, while others rely on untethered variants. Despite serving the same purpose, it is obvious that unplugging a tethered charging cable is not possible. Not being able to take the cable with them can be a problem when going somewhere where there is no compatible charging cable available. Still, as the extension mechanism for both these cables is the same, it is possible to extend them using a well-built cable. Still, the corresponding risks when doing this are the same as with other extension cables. Because of that, it is best to buy a longer type 2 or type 1 tethered or untethered cable.

How fast will the extension cable charge?

Another main concern that many EV owners have is whether the usage of expansion cable would affect the charging speed. This is a valid question, as the charging speed for all extension cables tends to fluctuate over a certain degree. However, using an extension with a higher power rating will minimize potential energy losses. This is a thicker wire that can handle more amps. For instance:

EV Charging Cable

Extension Cable Amperage Charge Speed
10amp (2.3kw) 16amp (3.6kw) 10amp (2.3kw)
10amp (2.3kw) 32amp (7.2kw) 10amp (2.3kw)
16amp (3.6kw) 32amp (7.2kw) 16amp (3.6kw)
16amp (3.6kw) 16amp (3.6kw) 16amp (3.6kw)
32amp (7.2kw) 16amp (3.6kw) 16amp (3.6kw)
32amp (7.2kw) 32amp (7.2kw) 32amp (7.2kw)


As you can see from the charge speed table, the car will always be limited to the lowest charging speed. So try and make sure your ev cable extension is the same amperage as your ev cable.

Are extension cables waterproof?

The answer to this question depends on the extension cable in use. There is more than one manufacturer who claims their expansion cables are both water and weatherproof but. However, the real-life applications may prove different and the reality sometimes contradicts their claims. Many sockets have a thermal vent to let out excess heat, which unfortunately helps the water penetrate them easily. Therefore, looking for sockets that are labeled as waterproof may be a good idea. This may help avoid shorts and other issues in case they come in contact with water. But trying not to expose aftermarket cables to water and extreme conditions is even a better one. Let’s not forget that manufacturers aren’t always honest when they advertise the specifications of their products.

A word of advice

Extending an EV charging cable should be your last resort since most automakers in the world discourage this practice. In case you decide to use an extension cable, make sure to follow all the guidelines and safety procedures. Avoid using tangled expansion charging cables, as these may have reduced heat-dissipating capability. In extreme situations, this can even lead to a short circuit or even fire. Moreover, try not to reach the safety threshold of the expansion cable and purchase a product with which a warranty has been offered.

About EV Cable Shop

Debbie has been working in the EV industry for over 7 years and has always had a keen interest in both advancing technology and sustainability. She is an expert in the field and is always up to date with the latest releases and news.

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