Where your installation is on what’s known as PME or TN-CS (Which most of the UK now is) there is a risk of ‘loosing a neutral’ which is outside of your control. This can happen within the electricity network supplying your home. The risk is the installation could rise to a dangerous voltage. To get around this the car chargers we use have ‘Open PEN Detection’ and automatically disconnect in the event of a fault, making them safe to use!