An EV charger is the biggest load in the house: 11 kW for several hours, every day. The wallbox installer expects a “prepared section” in the consumer unit — here’s what that means.
MCB and RCD
The charger section has a three-phase MCB (16 A for 11 kW, 32 A for 22 kW) and its own RCD. If the wallbox has built-in 6 mA DC fault detection (most new models do), a type A RCD is enough. Without that detection you need a type B, which is noticeably more expensive — so check the datasheet before buying the charger.
Load management
With a connection capacity of 11–14 kW, the charger plus an induction hob or a heat pump will trip the main fuse. Dynamic load management measures the house’s consumption at the supply and throttles charging when needed. In the consumer unit this is an energy meter with communication, connected to the charger.
Sub-meter
If the car is a company car, or you want to know what charging costs, add a three-phase MID-certified sub-meter.
11 or 22 kW
Most cars charge at home at a maximum of 11 kW (limited by the on-board charger). 22 kW needs a connection of at least 25 kW and a car with a matching charger — usually not worth it.
In the configurator, choose “EV charging” — the type B RCD and load management appear as priced options.