16A vs 32A EV Charging Cables: What's the Difference?

The difference is current capacity: a 16A cable carries less power than a 32A cable, and for most drivers a 32A lead is the safe default. On a single phase UK home, 16A delivers roughly 3.7kW while 32A delivers up to 7.4kW, which is the ceiling for a standard home supply. On three phase, 16A gives around 11kW and 32A gives up to 22kW. A 32A cable never charges slower than a 16A one, and it works fine on lower rated setups, so it rarely makes sense to save a little by choosing 16A. If you are still deciding which lead suits your car, our which EV charging cable do I need guide breaks it down.

At a glance: 16A vs 32A cables

What does the amp rating actually control?

The amp rating sets the maximum current the cable can safely carry, which caps the power it can deliver. A cable only ever delivers what the weakest link allows, whether that is your supply, the cable, or the car's onboard charger. So a 16A cable limits you to about 3.7kW even if your home and car could do more. A 32A cable removes the cable as a bottleneck, letting the car pull the full 7.4kW your single phase home can supply.

Is 32A always the better choice?

For most drivers, yes, 32A is the sensible default because it charges at the fastest speed a standard home allows and works on lower setups too. A 32A lead is safe to use with a car that only draws 16A, since the car and charge point negotiate the current down. The only reasons to pick 16A are a slightly lighter, cheaper cable, or a car that permanently caps its AC draw low. Even then, the future proofing of 32A usually wins.

Will a 32A cable charge my car faster?

Only if your car and supply can use the extra current. A 32A single phase cable delivers up to 7.4kW, which adds roughly 25 to 30 miles of range per hour, compared with about 15 miles per hour from a 16A lead at 3.7kW. But if your car's onboard charger caps AC at 3.7kW, both cables charge at the same rate. The cable never forces more power through than the weakest link permits, so check your car's AC limit.

Does three phase change the picture?

Yes, on three phase the same ratings deliver much more. A 16A three phase cable carries around 11kW and a 32A three phase cable up to 22kW. But most UK homes are single phase, so these figures only apply on three phase supplies, which are typically found at some public posts or commercial sites. A three phase cable still works on a single phase supply, it simply delivers single phase power. Only a minority of cars accept 11kW or 22kW AC anyway.

Which rating should I buy?

Buy 32A unless you have a specific reason not to. It gives full single phase speed now, works with lower draw cars, and future proofs you against a faster car later. Match the length to your parking: 5m for most driveways, 7m to 10m for on street or shared chargers. Compare the standard 7.4kW and 22kW formats on our Type 2 charging cables page to see what fits.

Quick decision checklist

• Standard single phase home and typical car: 32A single phase, up to 7.4kW
• Three phase supply and a car that accepts it: consider 32A three phase for 22kW
• Want the lightest, cheapest lead and drive a low draw car: 16A is acceptable

Frequently asked questions

Is a 16A cable safe to use?

Yes, a 16A cable is perfectly safe within its rating. It carries up to around 3.7kW on single phase. The only downside is speed: it charges more slowly than a 32A lead where the car and supply could use more. For low draw cars or a lightweight backup lead it is fine, but most drivers benefit from 32A.

Can I use a 32A cable on a 16A car?

Yes, it is safe and common. The car and charge point negotiate the current, so a 32A cable simply carries whatever the car requests, up to its own limit. You never force more current through than the weakest link allows. A 32A lead gives you headroom for a future car that can draw more.

Does a 32A cable use more electricity?

No, the cable rating does not change how much energy your car needs. You pay for the kilowatt hours delivered into the battery, not for the cable's maximum. A 32A cable can deliver those kilowatt hours faster, but the total energy, and therefore the cost, is the same as with a 16A lead.

Why is a 32A cable heavier?

A 32A cable carries more current, so it uses thicker copper conductors to do so safely. Thicker conductors add weight and a little stiffness. The trade off is worth it for most drivers because the extra capacity means faster charging and headroom. A 16A lead is lighter but caps you at a lower power.

Will 32A give me 22kW at home?

Only if you have a three phase supply. On a standard single phase UK home, a 32A cable delivers up to 7.4kW, not 22kW. The 22kW figure needs three phase power and a car that accepts three phase AC. Most homes are single phase, so 7.4kW is the realistic ceiling there.

Should I match the cable to my wallbox or my car?

Match it to the weakest relevant link. If your wallbox and supply allow 7.4kW, a 32A cable lets your car use that speed, provided the car's onboard charger can too. Choosing 32A covers the wallbox and most cars at once, which is why it is the common default recommendation.

In short, 16A caps you at roughly 3.7kW on single phase while 32A unlocks the full 7.4kW a standard home allows, and 32A works on lower setups too. For most drivers 32A is the safe default. To see how home charging speeds stack up, read our 7kW vs 22kW guide, or head straight to our cable finder by car to confirm the right rating for your model.