Wallbox installation checklist

A safe wallbox installation starts with a site survey and the exact equipment manual. Give the electrician the car’s AC limit, desired schedule and parking layout. The electrician assesses the supply and designs the circuit and protection. They also check local network rules, test the work and hand over records.

What should you decide before the electrician visits?

Start with how the car is actually used. Record daily distance, time parked at home and how much energy usually needs to be replaced overnight. A lower charging power can be enough when the car stays parked for many hours.

Find the vehicle’s maximum AC charging power and phase count in its manual. Do not confuse this with its DC fast-charging figure. A wallbox rated above the onboard AC charger will not make that car charge faster.

Decide which features have a real purpose:

• a tethered cable for quick daily connection;
• an untethered socket for a tidier shared space;
• dynamic load management for a constrained connection;
• access control for a communal or exposed parking place;
• scheduling or an energy-management interface;
• solar-surplus control when it matches the existing energy system.

Avoid choosing from the feature list alone. The wallbox must also fit the supply, earthing arrangement, weather exposure and local rules.

What should the site survey cover?

The electrician should inspect the intake, distribution board and proposed cable route. They need to understand the main protective device, earthing, available phases, other large loads and space for new protection. A photo is useful for planning but may not replace measurements on site.

The survey should also cover parking. Mark where each vehicle inlet may be when parked forward or reversed. Check whether the wallbox, connector or cable could be struck, trapped by a door or laid across a walking route.

For an outdoor or communal location, note rain exposure, direct sun, dust, impact risk, lighting and access by other people. The chosen enclosure and mounting arrangement must suit those conditions. The product’s declared IP and IK ratings answer different questions.

Ask how the supply capacity will be checked. The design should account for the rest of the building, not assume all connection capacity is free for the car.

Who decides the circuit and cable size?

The electrician does. Cable selection depends on current, length, installation method, grouping, ambient conditions, voltage drop and the applicable national wiring rules. A single cross-section copied from the internet cannot cover those inputs.

IEC 60364-7-722 addresses low-voltage circuits intended to supply EVs. It is an international installation standard, not a single EU installation law. Countries adopt standards and wiring rules through their own systems, sometimes with changes or additional requirements.

The wallbox manufacturer’s instructions are another required design input. They state terminal limits, protective-device assumptions, mounting conditions and commissioning steps. Manufacturer advice does not replace local law, and local law does not make the product manual optional.

What fault protection should be discussed?

Ask the installer to document protection against overcurrent, electric shock and residual current for this specific connection point. EV charging can produce residual-current waveforms that ordinary household advice does not fully cover. The wallbox may contain some protective functions, but the complete installation still has to be coordinated.

Two terms appear in product documentation. An RDC-DD is a residual direct-current detecting device. IEC 62955 covers these devices for permanently connected Mode 3 equipment. IEC 62423 covers Type B RCDs. They can respond to smooth DC residual current as well as specified AC and pulsating forms.

Example designs include a Type A RCD with suitable 6 mA DC detection, or Type B protection. These examples are not exhaustive. The correct arrangement depends on the equipment, upstream installation and locally adopted rules.

Do not accept “RCD included” as the whole answer. Ask what device is included, which standard it meets, what remains required upstream and how the finished protection was tested.

When does load management help?

Load management can reduce charging current when the building uses more power elsewhere. This can help a wallbox share a limited connection without relying on the user to remember every appliance. It does not create extra grid capacity.

Ask whether control is static or dynamic. A static limit caps the wallbox at one set value. A dynamic system measures relevant site load and adjusts available charging current.

The electrician must confirm meter or current-sensor placement, communication wiring, failure behaviour and settings. If several wallboxes are planned, ask how they share power and what happens when communication fails.

Keep a record of the commissioned limits. A later app reset, wallbox replacement or main-fuse change can make the original design assumptions wrong.

Where should the wallbox be mounted?

Place it so the normal cable route is short, visible and free from tension. Check the inlet on every likely car and both parking directions. A convenient electrical route can still create a poor daily cable route.

Follow the manufacturer’s mounting height, clearances and orientation. Protect the unit from vehicle impact where the survey identifies a risk. Do not put connectors where standing water, roof runoff or snow storage will collect around them.

For a tethered unit, provide a holder that protects the connector and supports the cable. For an untethered unit, allow space to insert the plug without a severe bend. Consider reach and accessibility for every intended user.

Which approvals or notifications are needed?

Check before work starts. Private wallbox rules are not harmonized into one EU notification threshold. The answer can depend on country, distribution network operator, power, connection agreement, building ownership and whether parking is shared.

Ask the installer to identify:

• any distribution-system-operator notification or approval;
• landlord or owners’ association consent;
• planning, heritage or parking restrictions;
• inspection and electrical certificate requirements;
• metering rules if electricity will be billed to another person.

Do not rely on a rule copied from a neighbouring country. Even closely connected markets can use different thresholds and forms.

What should happen at commissioning?

The installer should inspect and test the completed circuit under the applicable rules and the product procedure. Ask them to demonstrate safe isolation, startup, vehicle connection, current limiting and load-management response where fitted. Fault-protection testing should be recorded.

Confirm that labels and circuit schedules are updated. Save the wallbox manual, circuit design details, test results, certificates, network correspondence and commissioned settings. Record who can change maximum current or protection-related settings.

Before the installer leaves, perform an ordinary charging session. Check cable reach, connector support, app access and clear status messages. Make sure every household user knows how to stop a session and who to call for an electrical or billing fault.

What should you review later?

Inspect the wallbox and cable as the manufacturer instructs. Act on cracks, loose mountings, discolouration, damaged contacts or repeated fault messages. Do not bypass a fault to keep charging.

Call the installer when the building supply, solar system, battery storage, distribution board or charging load changes. Also review the design before adding another EV. The original spare capacity may already be in use.

The handover file makes that future work safer. A good installation is not only a wallbox that starts today. It is a documented system that another qualified person can understand later.