Wiring for split air-conditioning in Malta

Air-conditioning in Malta is sold as a single job and delivered as two. The installer brings the unit, the brackets, the copper, the drain and the vacuum pump. The circuit that feeds it is somebody else's problem, and the quote says so in small print. This article covers that second half: when an existing point will do, when it will not, and what the Maltese regulations actually require.

What the installation price covers

A published Maltese example makes the split explicit. ProChimps quotes standard split-unit installation from €100, including brackets, a standard pipe run, drainage, vacuum, gas check and handover. That figure varies by BTU, pipe run, wall type and outdoor access. Multi-split systems, long copper runs, scaffolding, rope access and core drilling are quoted separately.

So is the electrics. The same page states that electrical work beyond an existing suitable point is quoted separately, and that non-compliant wiring or faults found on site are quoted separately too. That second clause matters more than people expect. An installer who opens up a wall and finds a point fed off something it should not be fed off is not going to absorb the cost of putting it right.

Read "from €100" as the price of hanging and commissioning the machine where the electricity is already correct and already there.

Is the existing point suitable?

"Existing suitable point" is doing a lot of work in that sentence. A 13 A socket on the bedroom ring, or an outlet the previous owner left behind at high level, is a point. Whether it is suitable is a separate question, and the answer turns on what is behind it rather than what you can see.

The things that decide it:

• Is it a dedicated circuit, or shared? S.L. 545.24 reg. 13(1)(c) requires socket circuits to be final circuits separate from lighting circuits. An air-conditioner teed off a lighting circuit is not a borderline case; it is the wrong circuit.
• What RCD protects it? This is where most older Maltese installations fail for inverter units — see below.
• What is the unit's motor rating? Above 1.5 kW the supply arrangement itself changes.
• Is there local isolation? Particularly where the outdoor unit sits somewhere a person servicing it cannot see the consumer unit.

In shell-form property — still the normal way flats and maisonettes are sold here — there is frequently no point at all, only a chase and an intention. That is a new circuit, not a connection.

Type A RCDs and the 2024 amendments

This is the single change most likely to catch a buyer arriving from the UK with assumptions formed under a different regime.

The REWS regulations update booklet of November 2025 explains that RCDs must be of the appropriate type for the loads, under regulations 20(5) and 21(6) as amended by L.N. 283/2024. The specific reason it names air-conditioning: inverter air-conditioners can leak DC-offset earth fault current that a Type AC RCD will not clear. The minimum is therefore Type A. On three phase, Type B may be needed.

Practically, an existing point protected by a Type AC device is not suitable for a modern inverter unit, however sound the cable is. The remedy is at the board, not at the wall, and it is a different piece of work from running a cable. If the whole installation sits behind one Type AC RCD, the conversation becomes about the board rather than about the air-conditioner.

The 1.5 kW motor rule and your 40 A single phase

S.L. 545.24 reg. 23(1)(a) requires motor loads above 1.5 kW to be three phase with starting-current limitation, unless the distribution system operator waives it. A compressor is a motor load, so a larger unit — or a multi-split serving several rooms — can cross that line.

Set that against what a Maltese house actually has. As described in The Malta Independent's June 2022 column on electricity and water, Enemalta gives each house one phase at 40 A, at 230 V ±10%, and appliances over 3,000 W such as cookers need three phase. Forty amps is the whole house: the water heater, the oven, the washing machine and now a compressor that draws its hardest current at the moment it starts.

Two consequences follow. First, unit selection is an electrical decision as much as a comfort one, and it should be made before the installer arrives with brackets. Second, if the answer is three phase, that is a supply question, not a wiring question, and it has its own timeline. The sources used here do not set out that process, so this article does not pretend to.

Ground-floor maisonette, outdoor unit on the roof

A common Maltese layout: a maisonette at street level, a block of flats above it, and the only sensible place for the condenser is the roof three or four floors up. The cable has to pass through a building the maisonette owner does not own.

The November 2025 REWS booklet addresses this directly at reg. 22A(c). A maisonette under a block may extend a dedicated circuit to the roof — the outdoor unit is the example given — subject to three conditions:

1. The roof owner's permission.
2. The two earth systems are joined into one. This is the condition that gets skipped, and it is not optional.
3. The isolation for that circuit is placed in the meter room, next to the overlying premises' meters — so that whoever works on the roof can kill the circuit from a known location.

In practice this means the job involves the common parts, and condominium rules bind works in the common parts of a block regardless of what the electrical regulations permit. Get the permission settled before anyone quotes a cable run.

What it costs

Nobody publishes a figure. Our own rate card lists "Air-conditioning electrical point" with no price band at all — the unit is a point, described as a dedicated circuit for a split unit, quoted on site, and the source note records only that the installer quotes it separately.

That is an honest reflection of the variables: distance from the board, whether chasing is needed, whether the existing RCD is the right type, whether reg. 22A(c) applies, and whether the motor rating pushes you into reg. 23(1)(a). Any published figure would be a guess dressed as a rate. Where work is carried out, it falls under the Electrical Installations Regulations and should be done by a REWS-authorised electrician — the Maltese authorisation, not a UK scheme registration.