Connection application
A wallbox increases power consumption at a location where it was previously absent. For detached houses, this usually means submitting an application to change the parameters of the supply point with the distributor, which depending on the locality is ČEZ Distribuce, EG.D or PREdistribuce. The distributor will assess the network reserve and issue a statement with conditions.
If the size of the main circuit breaker is changed, the monthly payment for its capacity also changes. When switching to a tariff favourable for charging, the electricity meter is usually replaced as well. Both require scheduling with the distributor and are the most common reasons why implementation takes weeks.
House circuit breaker and spare capacity
The 11 kW station draws around 16 A per phase, the 22 kW around 32 A. The house must also handle everything else running simultaneously. From the bill and an inspection, it can be calculated whether the reserve is sufficient or if either the circuit breaker needs upgrading or dynamic power management must be implemented.
Power management is the more cost-effective solution for most homes: the station automatically reduces charging when household consumption rises. This requires measurement at the main supply and a compatible station.
Circuit breaker and RCD
Charging stations require stricter protection than standard sockets. During charging, a DC component of fault current may arise, which a standard AC-type residual-current device does not detect. Therefore, a Type B RCD is used, or a Type A RCD supplemented with DC component detection, which some stations have built-in.
In addition, the supply cable size is determined by the route length and current, along with a dedicated circuit breaker and surge protection. None of this can be estimated from an office; everything must be measured on-site.
Charging from a standard socket via an emergency cable is an emergency solution, not for regular operation. The socket and its wiring are not designed for several hours of draw near rated current; repeated overloading leads to heating at the connection point.
Initial inspection and handover
The completed installation is inspected by an inspection technician who issues the initial inspection report. This verifies fusing, RCD protection, cable sizing, shock hazard protection and compliance with standards. This report is what you submit to your insurer or distributor if they ask for anything. With us it is included in the handover along with documentation and training, not as an extra charge.