3-Phase EV Charger Requirements
A 3-phase car charger needs more than a suitable vehicle. We check your property’s electrical supply, charger compatibility and cable route, then explain the work and likely cost before you decide. Explore the requirements with Alderminster Group.
What to consider before choosing a 3-phase EV charger
Before comparing models, consider how your household uses the car, whether other high-demand appliances run at the same time, and what future charging needs might look like. We use those details to shape the recommendation.
Check the property’s electrical supply
A 3-phase charger needs a three-phase supply at the property. We check the incoming supply and available capacity before recommending equipment. If the property has a single-phase supply, we explain what an upgrade would involve.
Confirm what the car can accept
Your car may not use the charger’s full output, even if the charger can provide it. We check the vehicle’s maximum AC charging rate so you do not pay for capacity it cannot use.
Allow for other high-demand appliances
An electric shower, heat pump, induction hob or battery system can run alongside the charger. We assess the likely combined demand and explain whether load management or other electrical work is needed.
Assess the consumer unit and protection
Older wiring or limited space in the consumer unit can affect the installation. Our NICEIC-registered electricians check the existing protection, earthing and cable capacity, then specify the required protective equipment.
Plan the cable route to the parking space
The distance between the supply and parking space affects the cable size, excavation and finish. We agree a practical route around the building, driveway or outbuildings and include the related work in the quotation.
Consider where the car is parked
A charger beside the house may not suit a detached garage, barn or shared parking area. We check the mounting position, cable reach and access so the charger is usable without creating a trip hazard.
Decide what you may need later
A second EV, solar panels, battery storage or a future heat pump can change the electrical demand. We discuss those plans before sizing the installation, rather than treating the charger as an isolated addition.
Understand the work and cost before deciding
The final price depends on the supply, protection, cable route and any ground or consumer-unit work. We provide a written quotation before work starts, so the required installation is clear before you commit.
How 3-phase charging compares with the alternatives
Three-phase charging can shorten charging time, but it usually brings more demanding electrical work. A 7kW charger may involve a simpler installation, while a 22kW unit needs compatible equipment and sufficient supply capacity. We compare the likely cost and practical benefit.
A three-phase electricity supply
Your property needs a three-phase supply for a full 22kW charge. We confirm the incoming supply rather than assuming the charger can use it. If the home has single-phase power, we explain whether a 7kW charger is the more practical choice.
A compatible vehicle
Your car must have a three-phase onboard charger to use the full capacity. We check the vehicle specification, because some cars accept only single-phase charging even when the property has three-phase power.
A suitable charger
Your charger must match both the vehicle and the available supply. We specify compatible equipment and set the charging capacity correctly, so the installation does not promise more power than the car can use.
Electrical protection and earthing
Your existing consumer unit and earthing arrangement may need changes before a higher-powered charger is connected. We assess the protection, install the required equipment and complete the testing and certification.
A workable cable route
Your parking space may be separated from the house, or the cable may need to cross an external wall. We plan the route around the building, driveway and access points, keeping the finished installation safe and tidy.
Enough capacity for the rest of the property
Your charger will share the supply with heating, cooking and other electrical loads. We assess the demand and can consider load management where it helps avoid unnecessary supply upgrades.
A clear cost before work starts
Your price depends on the supply, protection, cable route and any remedial work. We survey the installation, provide a written quotation and explain the practical difference between 7kW and 22kW before you choose.
What a properly specified 3-phase installation includes
A three-phase supply doesn’t automatically provide capacity for a 22kW charger. We assess the incoming supply, earthing, protective devices and consumer unit, then identify upgrades.
An outdoor unit needs suitable protection, clear access and a practical cable route. We size the circuit and position isolation equipment, so charging shares electrical demand safely with the rest of the home.
A vehicle that accepts 22kW charging
Your car must support three-phase AC charging to use the charger's full output. We check the vehicle specification before recommending equipment.
A supply capacity check
Your three-phase connection may already serve other heavy loads. We assess the incoming supply and available capacity before adding the charger.
Correct circuit protection
Your charger needs protection suited to its design and the existing installation. We specify the RCD, breakers and other protective devices as part of the circuit.
A suitable consumer unit
An older consumer unit may not support the additional circuit safely. We check its condition, capacity and earthing, then explain any upgrade needed.
A practical cable route
The distance from the supply to the parking space affects the cable size and installation work. We plan a route that protects the cable and limits unnecessary disruption.
Safe isolation equipment
The charger needs accessible isolation for inspection and maintenance. We position the isolator where it can be reached without entering restricted areas.
Load management where needed
Other appliances can reduce the capacity available for charging. We assess the household demand and include load management when it helps prevent the supply being overloaded.
A suitable charger position
Your parking layout, walls and cable access determine where the unit can go. We agree a practical position that keeps the cable route tidy and usable.
Testing and clear handover
After installation, we test the circuit and charger operation. You receive the relevant electrical paperwork and an explanation of how to use the system safely.
Questions to ask before installing a 3-phase EV charger
What information do you need to recommend a 3-phase EV charger accurately?
An existing 3-phase supply may still need alterations. We inspect the intake equipment, meter arrangement and available capacity, then specify any distribution-board, protection or cable upgrades before installation goes ahead.
What if my property cannot support a 3-phase EV charger?
If the supply cannot support 3-phase charging, we can recommend a lower-rated unit, assess managed charging, or explain whether a supply upgrade is practical. You’ll receive clear costs before choosing.
What cable size does a 3-phase EV charger need?
The cable size depends on charger output, cable length, installation method and voltage drop. We calculate it for the route, then select suitable protection and explain any trenching or containment.
Does a 3-phase EV charger need planning permission?
Planning permission is not usually needed for a standard home charger, but listed buildings, conservation areas and unusual installations may require approval. We check the property and explain any application.
Does a 3-phase EV charger need load balancing?
Load balancing can reduce the chance that charging overloads the property’s supply. We configure compatible controls where appropriate and confirm how charging behaviour affects available power and other appliances connected.