Hot tub RCD outdoor socket: rules before you plug in

The pump cable on a new inflatable stops a few metres from the tub, and the nearest indoor socket is often the kitchen, beyond the patio door. A reel from the garage looks like a ten-minute fix. That shortcut is what a hot tub RCD outdoor socket is meant to replace. You want the pump on its 13 amp plug, into a socket that lead can reach, with a 30 mA device you test before the heater is in the water. A new outside socket is an electrician’s job. This page stops there.

We checked the Lay-Z-Spa UK FAQ, the brand’s electrical-issues page, the HSE note on electrically powered equipment, the IET Wiring Matters article from July 2021, and the GOV.UK recall of a Go Plus inflatable. The Aruba price and the battery attribute come from its amazon.co.uk listing. This is not a lab test. A qualifying purchase through our links can earn a commission at no extra cost to you.

In short

A Lay-Z-Spa supply, as the brand FAQ prints it, is 13 A at 240 V, about 2,050 W, with a built-in PRCD and a lead of about 4 m that plugs in directly. The HSE expects a 30 mA RCD and a test before use. BS 7671 is the installation standard an electrician works to, and the appliance standard on the pump will not tell you how to add a socket.

What the pump needs from a UK house

The Lay-Z-Spa FAQ states a 13 amp plug on a 240 volt supply, with heater and pump together around 2,050 watts. UK houses use a nominal 230 volt supply and a BS 1363 plug. You use the moulded plug that arrived on the pump and you leave its fuse alone. Divide 2,050 watts by 240 volts and the draw is about 8.5 amps. A 13 amp fuse covers that one load.

On the brand’s electrical-issues page the PRCD can be marked In: 16A. That is the rating of the protective device. The plug fuse is still 13 A. The same page lists a kettle or a freezer on the socket as a reason the supply trips. Give the tub its own socket.

The amazon.co.uk listing for the Lay-Z-Spa Aruba AirJet, model BW60061GB, clashes with that FAQ. The power attribute says battery powered. The bullets describe a heater and Freeze Shield, and the brand FAQ describes mains. Read it as a plug-in spa. The listing we used showed £394.74 and 4.4 from 30 ratings. It is the two- or three-person air-jet model on our inflatable hot tub comparison. Trust the pump plate and the FAQ when a field says battery. Another inflatable can print a different wattage, so if the plate and the FAQ disagree, ask the seller before you fill.

RCD, PRCD, and the test button

You need a residual current device. HSE guidance on electrically powered equipment points to 30 mA, a test button, and the device left in circuit. Press the test button before you use the tub. The supply should open. Reset it only after it has opened. A button that does nothing means an empty tub and the plug out. Tape on the button, or a housing wedged so it cannot trip, removes the protection the recall later on this page is about.

The block on the pump lead is a PRCD, a portable residual current device. Lay-Z-Spa fits one and still requires a direct plug into the socket. The portable device protects at the appliance. A house RCD, where the circuit has one, still has its own job. A PRCD does not turn a reel, a four-gang adapter or a lead through a window into a proper supply. The In: 16A mark rates the PRCD. The plug fuse stays 13 A.

The IET Wiring Matters article from July 2021 separates the jobs. BS 7671 is the standard for the fixed wiring. BS EN IEC 60335-2-60 is the appliance standard for this kind of product. It is the wrong document to mine for a spur, a cable size or a consumer-unit change, and this article will not invent those steps.

A test that opens the circuit shows the button worked today. It does not show the circuit was designed for a heater that runs for hours, or that the socket sits clear of the water. Ask that of the person who certificates the installation, and test again if the tub has stood unused in the rain.

Distance, height, and no extension lead

The Lay-Z-Spa FAQ pairs the extension-lead ban with two measurements: a lead of about 4 m, and a socket about 1.2 m above the ground. Place the tub where that lead meets a proper socket with no join in the middle, and keep the socket off the paving so a puddle is not soaking the faceplate. If the lead stops short, move the tub or have a socket fitted where the lead can finish. A thick orange reel is still an extension lead.

Shoppers often type outdoor socket IP44 beside the query. The faceplate has to be an outdoor socket an electrician will fit and stand behind. A plug-in RCD adapter in the kitchen still leaves a lead across the patio, which breaks the extension-lead ban.

The 4 m and 1.2 m figures belong to that FAQ. Another manual can print a shorter lead, and the manual in your box wins on length and height. Measure from the pump to the plug before you commit to a corner, and turn the tub so the lead runs away from the water.

The ban stays even if your own lead is longer than 4 m. The maker’s fault page already ties trips to extension leads. Once the plug is home, filling belongs on the inflatable hot tub set-up guide.

When you stop and call an electrician

A new outdoor socket is fitted by a competent electrician working to BS 7671. Outdoors, the IET article points to Section 702. A tub indoors, including in a bathroom, falls under Section 701. This page will not map zones, cable sizes or protective devices. If the socket you have is indoors, too far, or shared with the fridge, speak to the electrician before you fill.

Trips have a short checklist and a hard stop. Unplug the kettle and the freezer the maker names, and run the tub alone. Press the test button on the PRCD, and on a house RCD you are allowed to test from the front of the device. If the device trips as soon as the heater runs, with nothing else connected, stop and leave it unplugged. HSE guidance keeps the device in circuit, and a trip is a reason to investigate.

A bathroom is a design task under Section 701. Tell the electrician the room and the wattage on the plate, and ask whether a plug-in inflatable is eligible there at all. You also stop if the moulded plug is damaged, if the PRCD housing is cracked, if the lead has a connector that did not leave the factory, or if the tub is the recalled model below.

Why a recalled inflatable is the cautionary tale

GOV.UK published a recall for the Go Plus inflatable bubble massage spa, a portable round hot tub, under alert 2108-0216. The failure is a heater element that could leave a bather open to electric shock. The heater sits in the water. If the element fails, the water can become the path. The RCD should open the circuit. An extension lead the maker forbids, or a PRCD left defeated because it keeps tripping, takes that margin away.

The recall is one product. It is not a verdict on every inflatable on sale, and the Lay-Z-Spa FAQ is a different document from a Go Plus alert. Use the alert as the picture of a failed element. Then use your own plate, your own FAQ and your own electrician. If you own the model named in alert 2108-0216, follow the GOV.UK instructions for that alert. A newer socket does not cancel a recall.

With a sound supply in reach, the rest of ownership is water, cover and filter. Those jobs sit on the set-up guide and the inflatable hot tub comparison. Both assume the plug is already home in a proper socket.