How Far Can an EV Charger Be From the Fuse Box?

There is no single legal maximum distance between an EV charger and your fuse box (consumer unit). A charger can sit a good distance away, but the longer the supply cable run, the larger the conductor your electrician needs to use so that voltage drop stays within the limits set by BS 7671. A longer run usually means a thicker, more expensive cable, and the sensible approach is to keep the run as short as practical while still placing the charger where it suits your car. The right cable size for your run is a design decision for your installer, not a fixed rule you can look up. If you are planning a new installation, start with our EV installation guides and get the work quoted by a qualified electrician.

Is there a maximum distance from the consumer unit?

No. BS 7671 does not set a blanket maximum length for an EV charger supply cable. What it does set are limits on voltage drop and requirements for protection, and those are what govern how far the charger can realistically be.

In plain terms: electricity loses a little voltage travelling along a cable, and the longer and thinner the cable, the more is lost by the time it reaches the charger. Your electrician sizes the cable so the voltage drop over your run stays within the permitted range. A short run can often use a smaller cable; a long run needs a larger one.

So the honest answer is: as far as you need, within reason, provided the cable is sized correctly and the circuit is properly protected. The practical limit is cost and installation effort, not a number in a regulation.

Why does a longer run need a bigger cable?

Think of the supply cable like a pipe carrying water. A longer, narrower pipe loses more pressure along the way. A longer, thinner electrical cable loses more voltage. To keep the voltage arriving at the charger within the allowed tolerance, the electrician either shortens the run or increases the conductor size (the cross-sectional area, measured in mm2).

That is why two homes with the same charger can end up with different cable specifications. One has the fuse box in the garage next to the car; the other has it at the far side of the house. The second home needs a longer run, which can mean a larger cable, more labour and a higher price.

The takeaway is simple. Keep the run as short as practical, let the installer size the cable for your actual distance, and expect a longer run to cost a little more. For more on how conductors are chosen, see our guide on what size cable you need for an EV charger.

Supply cable or charging lead: which "cable" are we talking about?

This is where a lot of confusion comes from, because two very different cables get called "the cable".

• The fixed supply cable: the permanent wiring run from your consumer unit to the charger on the wall. This is the one we have been discussing. It is sized by cross-section (mm2) and installed by a qualified electrician. You do not buy this off a shelf; it is part of the installation.
• The charging lead: the Type 2 lead that plugs your car into the chargepoint. This is sized by length (metres), inlet type and amps. With an untethered (socketed) charger, you supply your own, and you choose the length to suit where the charger sits relative to your car's charging port.

So when you ask "how far can the cable reach", be clear which one you mean. The supply cable distance is an installation design question. The charging lead length is a product choice you make yourself. If you have an untethered charger, you can browse our EV charging cables and use our guide to choosing the right lead length to work out what suits your driveway.

What does each run length tend to mean?

The table below is a rough, hedged guide only. It is not a substitute for a proper cable calculation. Your electrician works out the exact specification from your run length, the charger's power, your supply and the installation method.

The figures people quote online vary a lot because they depend on charger power, cable type and route. Treat any "maximum metres" claim with caution and rely on your installer's calculation for your specific setup.

How do I keep the run short and sensible?

Placement is the easiest lever you have. A well chosen position keeps the supply run short and makes sure the charging lead reaches your car without strain.

1. Mount the charger near the side your car's charging port is on, where possible.
2. Pick a spot close to the consumer unit if the layout allows it, to shorten the supply run.
3. Choose a sheltered wall or post at a sensible height. Most wallboxes are weather-rated for outdoor use.
4. Make sure the charging lead can reach the port without trailing across a path people walk on.

Our guide on how to run a cable for an EV charger covers the routing in more detail, and where you should put an EV charger goes deeper on choosing the best spot. For the full picture, our installation overview, EV home charger installation: what to expect, walks through the visit itself.

Does the distance affect whether my supply can cope?

Distance and spare capacity are two separate questions, and both matter. Distance affects cable size; your main fuse and supply affect whether the circuit can be added at all. If your supply is tight, an installer may fit load management (for example a CT clamp) rather than upgrade the supply. Higher-power or three-phase installs can need prior approval from your DNO, which adds time.

If you are unsure whether your supply can take a charger, read can your home fuse box handle an EV charger before you plan the position. If you are weighing up more power, our guides on single phase vs three phase charging are a good next step.

Who should install it, and can I do it myself?

Installing or altering an EV charge-point circuit in England and Wales is notifiable work under Part P of the Building Regulations. Scotland and Northern Ireland have their own building standards. It must be carried out by a qualified electrician or registered competent person (such as a business registered with NICEIC, NAPIT or Stroma), or notified to building control. For grant-funded work, you need an OZEV-approved installer.

DIY is legal in principle only if the work is fully compliant with BS 7671 and properly notified and inspected, but for an EV circuit it is strongly discouraged and is realistically a professional job. The safest route is a qualified, OZEV-approved EV installer who will size the supply cable, fit the correct RCD and DC-fault protection, and notify the DNO. Always get two to three quotes before you commit. If you are at the planning stage, our guides on what you need to install an EV charger and how much it costs to install an EV charger will help you prepare.

If your charger trips its protection after install, our guide on why an EV charger trips the RCD can help you describe the problem to your electrician. And if you are using a plug-in portable unit in the meantime, see our portable EV chargers range.

Frequently asked questions

Is there a legal maximum distance between an EV charger and the fuse box?

No. BS 7671 does not set a single maximum length. The limit is practical: a longer run needs a larger supply cable to keep voltage drop within the permitted range, which your electrician sizes for your specific installation.

Why does a longer cable run cost more?

A longer run usually needs a thicker conductor to limit voltage drop, plus more labour and sometimes trenching or ducting. All of that adds to the quote, so keeping the run as short as practical tends to keep costs down.

Is the supply cable the same as the charging lead?

No. The supply cable is the fixed wiring from the consumer unit to the charger, sized in mm2 and fitted by an electrician. The charging lead is the Type 2 lead that connects your car to the chargepoint, sized in metres and chosen by you for an untethered charger.

Can my charger be in a detached garage at the end of the drive?

Often yes, but it depends on the run length, your supply and the route. A long run can need a larger cable and more work. Your installer confirms what is feasible and sizes the cable accordingly.

How do I keep the supply run short?

Place the charger as close to the consumer unit as the layout sensibly allows, ideally near the side your car's charging port is on. A shorter run usually means a smaller cable and a lower cost.

Can I run the supply cable myself to save money?

It is strongly discouraged. EV charge-point work is notifiable under Part P in England and Wales and must meet BS 7671. The safest route is a qualified, OZEV-approved EV installer. Always get two to three quotes.