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Can I Plug My Catering Trailer's 32 Amp Hook-Up Into a 13 Amp House Socket?

by Nick
(Southend on Sea, Essex, UK)

Burgundy horsebox catering conversion serving guests at a UK garden party, hooked up to the house

Burgundy horsebox catering conversion serving guests at a UK garden party, hooked up to the house

Hello
I am finding electricity a minefield, volts, watts, amps.I might as well be trying to read hyroglyphics.
My converted horse box has a 32 amp external round socket to which I plug in my 32 amp round plug which has 4mm cable. Can I attach a 3 pin 13amp plug on the other end of the cable to plug into my house or any other domestic property I may be at that does not have a round 32 amp socket for me to hook up to.
Many thanks i hope someone can help.
Nick .

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Oct 26, 2026
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by: MobCater

Nick, you are not alone. Volts, watts and amps confuse almost everyone when they first fit out a unit, and hooking up at someone's house is one of the most common situations you will meet.

The short answer is yes. A lead with a 13 amp plug on one end and a 32 amp round connector on the other is a recognised way to hook up, and caravanners use the same idea every weekend. There are two things you need to get right first, though.

The first is which way round the ends are. Look at the 32 amp fitting on your horsebox. On a correctly wired trailer it should be an inlet with pins, set into the bodywork, and your lead should have a socket on the trailer end. If your trailer really has a socket and your lead has a plug going into it, then fitting a 13 amp plug to the other end gives you a cable with pins at both ends. If one end is plugged in, the other end is live in your hand. Do not make that lead. Get an electrician to check how the trailer is wired before you go any further.

The second is what a 13 amp socket can actually give you. 13 amps at 230 volts is roughly 3,000 watts, about 3kW. That will happily run a fridge, lights and a small heated display. It will not run a 3kW water boiler, or a hot plate and a coffee machine at the same time. If you ask for more, the fuse in the plug blows. If the plug or socket is old and tired, it can get hot long before the fuse goes, so I would never leave a full 13 amp load running all day on a domestic socket. Your 4mm cable is fine for this, and the 13 amp fuse in the plug protects it.

My honest advice is to buy a ready-made 13 amp to 32 amp hook-up lead from a reputable supplier, or have a qualified electrician make one up for you, rather than wiring it at the kitchen table. Plug it straight into the wall socket, not into an extension reel, and make sure your trailer's consumer unit has RCD protection. That is a basic safety point, and it is something your insurer or an event organiser may well ask about.

One tip from experience. Write a short list of what can run together on a 13 amp supply and stick it inside a cupboard door, so whoever is working knows not to switch everything on at once.

Best wishes

David

Disclaimer: This is based on my experience in UK mobile catering. Rules and costs can change, so always do your own research and check with the relevant authorities before committing.

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