The Industrial Socket in the EV Garage: Making Sense of 32A Commando Charging

The blue 32A commando socket has a loyal following in UK garages. It is rugged, familiar to anyone who has run a welder or a heavy-duty compressor, and it can supply roughly 7kW to a compatible EV. That sounds like a wallbox for less money. In practice, the decision is a bit more nuanced.

A commando socket is not an EV charger. It is a power outlet. The charging intelligence and protection normally live in the portable EVSE you plug into it, or in the fixed wiring behind it. Whether that arrangement is smart for your garage depends on what you already have, how often you charge, and how much you value convenience over flexibility.

What the blue plug actually gives you

A single-phase 32A commando outlet at 230V offers about 7.4kW in theory. Most home EVs will accept somewhere around 7kW on AC, so the numbers line up nicely. The catch is that the portable unit you connect may not use the full 32A. Some are fixed at 16A, some at 10A, and some let you dial the current down. Always check the actual charging current, not just the plug size.

The appeal is flexibility. A 32A socket can run a portable EVSE, a welder, or a heavy-duty tool. If you already have one properly installed in a dry garage, adding a reputable portable charging unit can be a practical way to get useful overnight top-ups without committing to a tethered wallbox. It can also suit a second charging point for an occasional visitor, provided the supply and protection are up to it.

Where the trade-offs start to show

Cost is often cited as the big win, but the socket itself is rarely the expensive part. A new circuit, suitable RCD protection, isolator, earthing checks and an electrician's time can add up. Then you need a portable EVSE that is genuinely built for repeated EV charging rather than occasional use. A cheap unit with a blue plug and a long lead is not automatically a bargain.

Weather protection matters more than many buyers expect. A garage socket may be sheltered, but cables still trail across floors, through door gaps and towards the car. Look for a socket with a self-closing lid and a sensible IP rating, and mount it above the puddle line. An interlocked socket, which prevents the plug being removed under load, is a worthwhile detail. The portable unit's control box should also be rated for the conditions it will actually see, not just a sunny day.

RCD protection is the part to get right. EV charging can produce DC leakage that ordinary RCDs may not detect. In many UK installations, the circuit needs Type A protection with 6mA DC leakage detection, or a Type B RCD, along with overcurrent and fault protection. Some portable EVSEs include DC leakage sensing in the cable, but that does not automatically make the socket circuit compliant. An electrician should confirm the whole arrangement against the current wiring regulations.

Cable management is not a small detail

A 32A charging lead is thick, stiff in cold weather and awkward to coil neatly. If you are plugging in daily, that matters. A proper hook or holster keeps the cable off the floor, reduces strain at the plug and stops it becoming a trip hazard. Avoid tight coils around the control box, and do not let the cable get pinched in a garage door. The blue plug is tough, but the cable and the terminals behind it deserve some care.

There is also the question of where the portable unit lives. If it stays in the boot, you get flexibility away from home but a daily unpacking ritual. If it stays plugged in, it is vulnerable to damp, dust and the occasional clumsy foot. A dedicated wallbox with a tethered cable is simply easier to live with for most people.

When a commando socket makes sense

This setup is most sensible when the socket is already there, properly installed and protected, and your charging is occasional rather than a nightly routine. It also works for drivers who value one outlet that can do several jobs, or who need a second, slower charging option without another tethered unit on the wall.

It makes less sense when you are starting from scratch. If you are paying for a new circuit anyway, a dedicated 7kW wallbox usually gives you a tidier long-term solution: built-in protection, smart scheduling, load management, a lockable connector and a cable that lives on the wall rather than in a puddle. For most UK driveways, that convenience is worth the extra outlay.

Checks before you trust it

Have the circuit inspected and tested by a competent electrician. Confirm the RCD arrangement, the earthing, the torque on the terminals and the IP rating of the socket and enclosure. Check that the portable EVSE is from a reputable brand, carries UKCA or CE marking, has thermal protection and lets you set the current to match the circuit. After the first half-hour of charging, feel the plug and socket for unusual heat. If anything is warm enough to worry you, stop and get it checked.

Do not use an extension lead, a travel adapter or a domestic 13A plug in place of the commando connection. Do not pull the plug out while the car is charging. Keep the socket lid closed when not in use, and keep the cable clear of door edges and standing water. These are simple habits, but they are the difference between a useful garage upgrade and a nagging worry.

The 32A commando socket is still a sensible piece of kit in the right garage. It is just not a universal shortcut to cheap EV charging. Treat it as an outlet that needs proper protection and a decent portable unit, and it can earn its place. Treat it as a bargain wallbox replacement, and the blue plug will probably disappoint.