EXPERT ADVICE
Does an EV charger need a dedicated circuit?
Updated 07/26
By: Laura Macdonald
Reviewed: Content Team
Yes, and this isn't optional. An EV charger pulls a sustained, substantial amount of power, far more than typical household appliances, and needs its own dedicated circuit to charge safely without disrupting or damaging the rest of your home's electrics.
Why sharing a circuit isn't an option
The specific wiring requirements involved
What role RCDs and earthing play in the setup
The certification this work requires
Roughly what installation costs
Who's qualified to do the work
Find an electrician near you
Why does an EV charger need a dedicated circuit?
Safety
Sharing a circuit with other appliances risks overloading it, frequent tripping, or damage to wiring and components from sustained heavy load. This can also damage your EV, the charger, and your home's electrics.
Efficiency
Shared circuits mean appliances compete for power. This can cause inconsistent charging or disrupt other devices while your EV charges.
Compliance
UK Wiring Regulations (BS 7671) require a dedicated circuit for each EV chargepoint. Installing one counts as notifiable work under Part P of the Building Regulations. This means it must be signed off and certified by a registered electrician. Skipping this can cause problems later with insurance, remortgaging, or selling your home.
Wiring requirements for an electric car charger
1. Dedicated circuit
Your charger needs its own circuit at the right amperage. Most Level 2 chargers run at 230V and need a dedicated circuit of at least 40 amps, though this depends on the specific charger.
2. Cable size
The cable connecting the charger to your consumer unit must be sized correctly for the power it'll carry. A 7kW charger commonly uses a 6mm² cable.
3. Circuit breaker
Protects against short circuits by cutting power if the circuit exceeds safe levels. This helps prevent overheating and fire risk. It must be rated appropriately for your specific charger.
Choosing the right charger in the first place shapes a lot of these requirements. Our EV charger buying guide covers speed, connector type, and current government grants.
4. RCD protection
Protects against earth faults and leakage, cutting power if an imbalance is detected to prevent shock. A qualified electrician will advise whether your setup needs a Type A, Type B, or Type F RCD.
On Checkatrade, you'll only find trades who meet our high standards and pass up to 12 checks.
5. Earthing arrangements
Correct earthing prevents shock and equipment damage in the event of a fault. An electrician needs to assess your home's existing earthing system and confirm whether extra protection, such as an earth rod, is needed.
How much does this cost?
Electricians typically charge £45-£60 per hour, or around £400 per day, for EV charger installation. Additional costs can include:
Consumer unit upgrade, if your existing board can't take the extra load
A new isolator switch, often required
Rapid charging cables (such as CHAdeMO or CCS), depending on type and length
Our EV charger installation cost guide has current pricing for all of this, and it's worth getting several quotes to compare like-for-like.
How much does it cost to install an EV charger at home?
From slow chargers to fast chargers, our cost guide is the ideal way to find the right charger for your home. Find out the ballpark electric car charger installation cost to expect for your installation.
Find a certified EV charger installer near you
Most domestic EV chargers need an Electrical Installation Certificate (EIC) from a competent electrician to validate their warranty. Check your installer is registered with NICEIC and/or OZEV before booking.
Before you book installation
FAQs
Not recommended. Sharing a circuit risks overloading the system, inconsistent charging, and tripping the breaker.
Yes, this is a UK safety requirement, protecting against faults or leakage that could otherwise cause shock or fire.
Its own dedicated circuit, with the amp rating depending on the charger's power. Most Level 2 chargers need at least 40 amps at 230V.
Usually not. A dedicated circuit is needed, but a full rewire isn't typically required. A qualified installer will assess your setup and confirm what adjustments, if any, are needed.
Yes. Installation must be carried out by a qualified, competent electrician in line with Part P, who will notify the DNO and provide you with a compliance certificate.
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