What size of cable is required for a 30kw electric vehicle charger

Someone asked, what size of cable is needed for a 30kw electric car charger? This question may seem simple, but when it comes to matching, it's actually not that absolute.

Why is that a bit confusing?

Nowadays, there are more and more electric vehicle chargers, especially the 30kw DC piles installed in residential areas and small factories. The main problem lies in these variables: distance, laying method, and ambient temperature, all of which are different.

For example, if an electric car charger is installed next to an electricity meter, there is a significant difference in cable length compared to when it is installed at the end of the yard. Whether you bury it underground, walk through pipes and walls, or directly overhead, the heat dissipation conditions are different. There is a difference in the cable's load-bearing capacity between places that are exposed to direct sunlight in summer and those that are cool all year round. Also, copper wire or aluminum wire? Copper wire is expensive but has good conductivity, while aluminum wire is cheap but needs to be thicker.

Here are a few reference ranges for everyone

We usually say that a 30kw electric car charger, calculated based on three-phase 380V electricity, has a rated current of about 45-50 amperes.

Short distance (within 30 meters): If using copper core cables, a 6mm square cable can run, but it is best to look at a 10mm square cable for stability. Aluminum core should be viewed as 10 square or 16 square.

Medium distance (30-80 meters): 10 square millimeters of copper core is a common reference value. The recommended starting area for aluminum core is 16 square millimeters.

Long distance (above 100 meters): The copper core may be 16 square meters or even larger. Because the wire is too long, the voltage may drop, and the pile may charge slowly or sound an alarm.

Hongjiali(HG Power) 30kw electric vehicle chargers project

How did everyone actually do it?

Many people directly ask 'Is 6 square meters enough?' or 'Is 10 square meters okay?' Actually, it depends on the specific situation. The manufacturer's suggestion is that on one hand, the experience of the on-site electrician also applies. Some places have strict requirements, and according to the standards, they must be enlarged by one size; Some places have good heat dissipation and are close to each other, so even a smaller size can be used. However, whether it will generate heat in the long run or not, you have to weigh it yourself.

Some small reminders: Cable sheaths should be resistant to oil and weather, especially outdoors. The wiring terminals need to be tightly pressed, and if they become loose, they are prone to burning. If going underground, it is best to protect it with armor or casing.

At the end of the day, there is no fixed rule of "must use how big" the cable required for a 30kw electric vehicle charger is. The most reliable way is to ask the technicians who sell cables or install electric vehicle chargers based on your actual distance, installation environment, and wire material. They have seen many situations before and provide references that are closer to your on-site conditions. Don't blindly follow other people's specifications. If you get overheated and have an accident, it will be a big problem.