The short answer: keep a 5 m Type 2 to Type 2 cable in your boot, stored in a cable bag, and you will be able to charge at the vast majority of public AC destinations across the UK. If your car’s inlet is on an awkward side or you regularly park nose-in to a bay wall, step up to 7 m. Either way, the connector type is the same (Type 2 both ends) and so is the advice: store it properly and it will last years.
Why you need to carry your own cable
This is the piece of information that catches most new EV owners out, and it is worth stating plainly before anything else.
Public AC posts in the UK are untethered
The overwhelming majority of public AC charging posts in the UK do not have a cable attached to them. The post provides the power socket; the cable is your responsibility. If you arrive at an untethered AC post without a Type 2 cable, you cannot charge. Full stop.
We hear from customers regularly who have pulled up to a charger at a supermarket or car park, looked for a cable to plug in, and found nothing, because there is nothing to find. Understanding that you must carry your own cable is the single most important insight for any EV driver who uses public charging, even occasionally.
For a full breakdown of which connector type your car uses and why, see our full guide to which EV charging cable you need.
DC rapids are different because those chargers have their own cables
DC rapid chargers (CCS, CHAdeMO, and Tesla Superchargers) are tethered: the cable is built into the charger unit itself. You do not need to carry anything for a DC rapid session. The boot-cable question applies specifically to AC charging: the slower, destination-style charging you find in car parks, supermarkets, hotels, and on-street lamp-post chargers.
Which connector does your boot cable need?
- Left side: Type 2 male plug (7 pins labelled L1, L2, L3, N, PE, CP, PP) with the label Car end (male plug)
- Right side: Type 2 female socket (matching 7 pins) with the label Charger-post end (female socket)
- Centre: cable illustration connecting the two ends
- Footer label: Type 2 to Type 2. This is the cable you carry in your boot
Type 2 (IEC 62196-2): the UK standard since approximately 2018
Every EV sold new in the UK from approximately 2018 onwards has a Type 2 inlet, specified under IEC 62196-2. Type 2 is also the connector standard used on public AC charge posts across the UK and across continental Europe. Your boot cable needs Type 2 on both ends: a male plug at the car end and a female socket at the charger end. This is sometimes written as “Type 2 to Type 2” or “T2-T2”.
Popular models using Type 2 include the Volkswagen ID.4, Hyundai IONIQ 5, Kia EV6, Nissan Leaf (2018 onwards), BMW i4, and (despite having their own Supercharger network) the Tesla Model 3. If you own a Model 3, a standard Type 2 to Type 2 cable is the correct cable for your boot.
What about older Type 1 cars?
Type 1 (SAE J1772) is the older connector standard used on some early imports, including the Nissan Leaf pre-2018 and some Mitsubishi Outlander PHEVs. If you own a Type 1 car, you need a Type 1 to Type 2 cable instead. This article is focused on the Type 2 scenario because it covers the vast majority of EVs on UK roads today; if you are unsure which connector your car uses, our full EV charging cable guide covers both.
How long should your boot cable be?
- 5 m → ~1.0 kg
- 7 m → ~1.3 kg
- 10 m → ~1.8 kg
- 15 m → ~2.5 kg
- (all figures for 7.4 kW single-phase TPE-jacketed Type 2 cables)
- Annotate 5 m bar: Recommended default
- Annotate 7 m bar: Worth considering if port is on far side
- Annotate 10 m bar: Boot cable overkill for most
The length question is where most generic advice falls down. “Just get the longest you can” sounds sensible but is not right. Here is what the trade-offs actually look like:
| Length | Approx weight | Best for | Trade-off |
|---|---|---|---|
| 5 m | ~1 kg | Most public posts + home wallbox | Limited reach for very awkward post placement |
| 7 m | ~1.3 kg | Distant posts, far-side inlet, reversed bays | Heavier, slightly less compact to coil |
| 10 m | ~1.8 kg | On-street posts, very awkward layouts | Bulk in boot, cable drag on floor, slight voltage drop at higher currents |
5 m: the default for most drivers
Five metres is the right starting point for the majority of UK EV drivers. Standard public AC bays are designed with a cable run of roughly 3-5 m in mind; a 5 m cable reaches the socket without leaving metres of loose cable trailing across the ground. At approximately 1 kg, it coils into a compact bundle that fits any boot without taking up meaningful space.
7 m: when is it worth the extra weight?
Seven metres makes sense if your car’s charging inlet is on the far side from where the post socket sits, or if you regularly park in bays where you reverse in and the post ends up behind you. The extra 2 m adds roughly 300-400 g, noticeable but not burdensome. If you are at all uncertain between 5 m and 7 m, and your car’s port is on the passenger-side rear or you often use tight multi-storey bays, go to 7 m.
Why we do not recommend 10 m as a primary boot cable
Ten metres is more cable than most drivers need day-to-day, and the downsides are real. You are carrying roughly 1.8 kg of cable. The excess typically ends up draped across the car park surface, a trip hazard and a fast way to wear out the outer jacket. At higher charge rates (close to 7.4 kW), there is also a small but measurable voltage drop across a longer conductor. Use 10 m when you have a specific, consistent reason: on-street parking where the post genuinely is 8 m from your inlet. Do not default to it.
Single-phase or three-phase: does it matter?
A 7.4 kW single-phase Type 2 cable works at every public AC post in the UK. A 22 kW three-phase cable also works everywhere. It will draw single-phase at posts that only supply single-phase power, which is the majority. The three-phase cable costs roughly £20 more and delivers extra charging speed only if your car’s onboard AC charger actually supports three-phase input. Check your car’s spec sheet: if the maximum AC charge rate is listed as 7.4 kW, a single-phase cable is all you need. If it lists 11 kW or 22 kW, a three-phase cable will let you take advantage of faster AC destinations.
Should you keep a granny cable in the boot too?
Yes, as a second item, with a separate role.
What a granny cable is for (and what it is not for)
A Mode 2 “granny” cable has a standard 13 A domestic plug at one end and a Type 2 at the other. It charges at approximately 2.3 kW from a household socket, roughly the speed of charging a phone through a mains adaptor, scaled up to a car. A 60 kWh battery would take around 26 hours for a full charge from empty. That is genuinely slow.
The granny cable is not your everyday charging solution. It is a spare-tyre equivalent, there for the situation where you are stranded, no public charger is nearby, but you have access to someone’s domestic outlet. In that scenario, being able to add 30-40 miles of range overnight can make the difference between a stressful situation and a manageable one.
Keep the granny cable in the boot in its own separate bag so it does not get confused with the main Type 2, and think of it as your emergency backup.
How to store your boot cable properly
Loose in the boot is not storage; it is how connectors get damaged.
The Type 2 plugs and sockets at each end of your cable are precision-engineered components. Drop a Type 2 male plug on tarmac from boot height and you risk bending or cracking the pin housing. Let grit work into the socket over a few months and it can cause insertion problems or corrosion. Coil the cable too tightly over a long period and you stress the jacket at the bend point.
A cable bag solves all of this. A well-designed EV cable storage bag holds the cable at a safe coil radius, covers both connectors to keep debris out, and means the cable arrives at the charger in the same condition it left the boot.
At EV Cable Hub, when we look at our returns data, the most common reason customers order a replacement cable is that they have lost their original, not that it has failed. The second most common issue we see is connector damage that could have been avoided with proper storage. A cable bag is a small investment that meaningfully extends cable life.
Frequently asked questions
Do I need to carry an EV charging cable in my car?
Yes, if you use public AC charging. UK public AC posts are untethered. The charger provides the power socket but not the cable. You must bring your own Type 2 cable. DC rapid chargers (CCS, CHAdeMO) are different: those always have the cable built into the unit.
What type of EV charging cable should I keep in my boot?
A Type 2 to Type 2 cable, specified under IEC 62196-2. Type 2 is the standard fitted to every EV sold new in the UK from approximately 2018 onwards, and it is the connector standard used on public AC charge posts. Both ends of the cable are Type 2: male plug at the car, female socket at the charger post.
How long should my boot EV cable be?
Five metres is the right default for most drivers. It reaches the socket on virtually all standard public AC posts while remaining light (around 1 kg) and easy to store. If your car’s charging inlet is on the far side from the post, or you regularly reverse into bays, choose 7 m.
Can I use a 10 m cable as my main boot cable?
You can, but we would not recommend it for everyday use. A 10 m cable weighs roughly 1.8 kg, trails excess cable on the ground (a wear and trip risk), and at higher charge rates there is a measurable voltage drop over the additional conductor length. Five or seven metres works better as a daily boot cable.
Should I also keep a granny cable in my boot?
Yes, as a second, separate item. A Mode 2 granny cable (domestic 3-pin to Type 2) charges at approximately 2.3 kW from a household socket. It is very slow but invaluable in a genuine emergency when no public charger is accessible. Keep it separate from your main Type 2 so there is no confusion about which to grab.
Do I need a cable bag?
We strongly recommend one. Connector damage from grit ingress or physical impact is an avoidable cause of cable failure. A cable bag protects both ends, maintains a safe coil radius, and keeps the boot tidy. Based on our experience at EV Cable Hub, connector damage from poor storage is one of the most common avoidable cable problems we see.
Is a 7.4 kW single-phase cable or a 22 kW three-phase cable better for my boot?
A 7.4 kW single-phase Type 2 cable works at every public AC post in the UK. A 22 kW three-phase cable also works everywhere but costs roughly £20 more, and only delivers the extra speed if your car’s onboard charger supports three-phase AC input. Check your car’s spec: if the maximum AC rate is 7.4 kW, single-phase is all you need.
What cable does a Tesla Model 3 need?
The Tesla Model 3 uses a Type 2 inlet, so a standard Type 2 to Type 2 cable is the correct boot cable. See our dedicated Tesla Model 3 charging cable guide for model-specific length and spec recommendations.