Tethered vs Untethered Wallbox: Which Cable Setup?

The cable difference is simple: a tethered wallbox has the charging lead permanently attached, so you never handle a separate cable at home, while an untethered wallbox has a socket and you plug in your own Type 2 lead for each charge. Tethered is grab-and-go convenience with a fixed connector and length. Untethered is a tidier unit with the freedom to swap cable lengths, upgrade a worn lead, or use the same cable at public points. Both charge at the same speed for the same power rating: the choice is about handling and flexibility, not performance.

At a glance: tethered vs untethered cable setup

What is the real difference for the cable?

With a tethered box the cable is part of the unit, chosen when you order and fixed for the life of the charger. You never buy a separate lead for home use. With an untethered box you buy a Type 2 to Type 2 cable yourself and plug it in each time. That single decision drives everything else: convenience, tidiness, cost and how future-proof your setup is. Neither is faster: charging speed depends on your supply, the box's rating and your car, not on whether the cable is attached.

When does a tethered wallbox suit you?

A tethered box suits drivers who want the least effort. The connector is always hanging there, so you grab it, plug in and walk away, which is ideal in cold or wet weather when handling a coiled cable is a chore. It works best when you keep one car with a known connector and a fixed parking spot. The downsides: the length is locked in, and if you switch to a car with a different inlet the fixed connector may not fit, so you would need to change the whole unit.

When does an untethered wallbox suit you?

An untethered box suits drivers who value flexibility and a tidy wall. You choose the cable length, replace it easily if it wears, and swap the lead if you change to a car with a different connector. The same cable also serves untethered public and workplace points, so you are not carrying two leads. The trade off is the small extra cost of the cable and the habit of coiling it away after each charge, plus the lead needs somewhere to live.

Does the cable setup change charging speed?

No. A cable only delivers what the weakest link allows, whether it is tethered or untethered. Speed comes from your home supply, the wallbox rating and your car's onboard charger. A 7.4kW box charges at 7.4kW either way, adding roughly 25 to 30 miles of range per hour. The one caveat is the cable's current rating: an untethered lead must be rated to your box, so a 32A cable for a 7.4kW unit and a three-phase cable if you have 22kW and a car that accepts it.

Which should you choose?

Choose tethered if convenience is everything, you have a settled car and parking spot, and you never want to handle a loose cable. Choose untethered if you want a cleaner-looking unit, the freedom to change cable length or connector later, and one lead that also works at public points. Popular untethered units, such as Andersen chargers, are chosen partly for that tidy look. Whichever you pick, make sure any lead is a genuine Type 2 cable rated to your supply.

Frequently asked questions

Is tethered or untethered better?

Neither is universally better. Tethered is more convenient day to day because the cable is always attached, while untethered is tidier and more flexible because you choose and can change the lead. They charge at the same speed for the same power rating, so pick based on how you park, whether you might change car, and how much you dislike handling a cable.

Do I need to buy a cable for an untethered wallbox?

Yes. An untethered box has a socket rather than an attached lead, so you supply your own Type 2 to Type 2 cable. Match the current rating to your box, usually 32A for 7.4kW single phase or a three-phase cable for 22kW, and pick a length that reaches your car's inlet with a little slack.

Can I change the cable length on a tethered charger?

Not easily. A tethered cable is fixed at purchase, so the length is set for the life of the unit. Choose carefully at the point of order, typically 5m or 7m, based on where you park. If your needs change later you would generally need a new unit, whereas an untethered box lets you simply buy a longer lead.

Does an untethered wallbox charge slower?

No. Charging speed depends on your supply, the wallbox rating and your car, not on whether the cable is attached. A quality untethered lead rated to your box delivers the same power as a tethered cable. Just make sure the lead's current rating matches the unit, a 32A cable for 7.4kW or a three-phase cable for 22kW.

Can I use my home cable at public chargers?

If you have an untethered setup, yes. The Type 2 lead you use at home also works at untethered public and workplace points, which expect you to bring your own cable. Rapid DC chargers always have their cable attached, so you never bring a lead for those regardless of your home setup.

What if I change to a different car?

An untethered box handles this easily: if the new car has a different inlet, you just buy a lead with the matching car end. A tethered box has a fixed connector, so a car with a different inlet may not fit, which could mean changing the unit. This flexibility is a key reason drivers choose untethered.

The cable question comes down to convenience versus flexibility, and there is no wrong answer if you match the lead to your supply. For a broader look at the chargers themselves beyond just the cable, read our guide on tethered vs untethered EV chargers, and if you have chosen an untethered box see what cable you need for an untethered home charger. When you are ready, browse our Type 2 charging cables by power and length.