Mostreno · Guides · Electrical

The electrical guide.

What goes in the walls, what sits in the board, and what a compliant job in Dubai actually includes. Written so you can tell a proper quote from a cheap one.

01Wiring and rewiring

Everything downstream depends on this.

Wiring is the one part of a renovation that has to happen before anything else and is impossible to change afterwards without breaking walls. Decide where the power goes while the walls are still open.

Methods
Concealed wiring
Chased into the wall and plastered over. The finished look, and the reason chasing happens before plastering.
Surface conduit
Run on the face of the wall in trunking. Fast, cheap, and visible.
Trunking
Multiple circuits in one channel with a removable lid. Easy to add to later.
Data and network
Cat6 to each room, back to one point. Cheap during a renovation, painful after.
Services
01
New wiring
extensions, new builds and offices. Priced per point rather than per metre
02
Full rewiring
replacing wiring that is aged, undersized or unsafe. Done at shell stage where possible
03
Concealed wiring
chased into the wall and plastered over, which has to happen before finishes go on
04
Data and network cabling
Cat6 to each room back to one cabinet. Trivial now, disruptive later

02The distribution board

The four devices that keep a building safe.

Most people never open the board and could not name what is in it. These are the components, what each one actually does, and which of them protects the wiring versus which protects you.

Circuit breakers (MCB)
One per circuit. Trips on overload, which is it doing its job rather than failing.
RCD / RCCB
Cuts power when current leaks to earth. This is the device that protects a person, not the wiring.
Main switch
Isolates everything. Know where it is before you need it.
Surge protection
Clamps voltage spikes before they reach the appliances. Cheap next to what it protects.

03Sockets and switches

Small items, and the ones you touch daily.

Position matters more than specification. A socket six inches from where you need it is as useless as no socket, and moving one later means chasing a finished wall.

Standard socket
13A three-pin. Plan more than you think you need — every one added later means chasing a wall.
USB outlet
Sockets with integrated USB-A and USB-C. Bedside and kitchen, mostly.
Smart switch
App and voice control, scheduling, scenes. Needs a neutral wire at the switch.
Designer plate
Brushed steel, black nickel, brass. The visible part, and it costs a fraction of the job.

04Lighting

Fittings, and the colour of the light they give.

Two decisions, not one: the type of fitting and the colour temperature of the lamp. The second is what people get wrong, and it is the cheaper of the two to change.

Fittings
Recessed downlights
Flush in the ceiling. General light. Roughly a metre apart, out of the wet zone unless IP rated.
Track lighting
Heads that move along a rail. The flexible answer when the layout may change.
Wall washers
Aimed at a wall rather than the floor. Makes a room feel larger than downlights do.
LED strip
Cove, shelf or under a unit. Glow with no visible source, and no glare.
Colour temperature
2700K — warm white
Yellow and soft. Bedrooms, living rooms, anywhere you relax. The closest to old filament light.
3000K — soft white
Still warm but cleaner. The safe default through most of a home.
3500K — neutral
Between warm and cool. Hallways and dressing areas, where you want colours true.
4000K — cool white
Bright and crisp. Kitchens, bathrooms, laundry. Task light, not mood light.
5000K+ — daylight
Blue-white and clinical. Garages and workshops. Unforgiving in a living room.
Control
01
Dimmable circuits
decide before first fix; a dimmable driver is not a later addition
02
Smart lighting
app control, scenes and scheduling. Needs a neutral at each switch
03
Accent circuits
spots and wall washers on their own switch, so they can run alone

05Faults and what they mean

What the symptom is actually telling you.

Most electrical faults announce themselves before they become dangerous. Knowing what each symptom points at tells you whether it is a nuisance or something to stop using.

01
Breaker keeps tripping
usually a genuine overload or a failing appliance, occasionally a fault in the circuit. Repeatedly resetting it is not a fix
02
Flickering lights
often a loose connection at a switch or fitting. It can also be a failing driver on an LED
03
Overheating outlets
a socket or plate warm to the touch means a loose terminal generating heat. Stop using it and have it looked at
04
Frequent surges
can be the supply, can be a large appliance on the same circuit. Surge protection at the board is the usual answer
05
Buzzing from the board
a loose busbar or a failing breaker. Not something to leave

06Emergencies

What to do, before anyone arrives.

None of these are things to investigate yourself. The right action is almost always to isolate the power and wait for someone qualified.

01
Burning smell or smoke
switch off at the main and leave the property. Do not open the board to look
02
Sparking or exposed wiring
do not touch it, do not attempt to cover it. Isolate the circuit if you can reach the board safely
03
Complete power loss
check whether neighbours have power before assuming it is your installation. If it is only you, check the main switch and the RCD
04
Water reaching sockets or fittings
isolate at the main before going near it. Water and a live circuit is the one that kills people
05
Electric shock from an appliance or fitting
isolate the circuit and stop using it entirely until it has been tested

07Safety and compliance

What a proper job includes.

Electrical work is the one trade where a cheap quote can cost you a building. These are the things that should be in any electrical scope in Dubai, and the things to ask about if they are not mentioned.

01
Use a licensed contractor
electrical work in Dubai must be carried out by a DEWA-approved contractor. It matters for insurance as much as for safety
02
RCD protection on every circuit
a breaker protects the wiring; an RCD is what protects a person
03
Proper earthing
verified, not assumed. It is the part nobody sees and the part that fails quietly
04
Correct cable sizing
an undersized cable carrying a load it was not rated for is how fires start
05
Test and certify on completion
you should be handed test results, not a verbal assurance
06
Building approvals
jointly owned towers usually require notification before work on the distribution board
Questions

What homeowners ask first.

Do I need a licensed electrician in Dubai?

Yes. Electrical work must be carried out by a DEWA-approved contractor. Beyond the safety question, unlicensed work can invalidate your building and contents insurance.

How long does rewiring an apartment take?

A two-bedroom apartment typically takes 4–7 working days for first fix, then second fix after finishes. A full rewire is best done as part of a wider renovation, because it involves chasing walls.

Can you add sockets without breaking the walls?

Sometimes. Surface trunking avoids chasing but is visible. Concealed sockets need the wall opened, plastered and repainted, so it is far cheaper as part of other work.

My breaker keeps tripping. Is that dangerous?

The trip itself is the safety device doing its job. Repeated tripping means something is wrong — an overloaded circuit, a failing appliance or a fault in the wiring. Resetting it repeatedly without finding the cause is not safe.

Do you provide test certificates?

Yes. On completion you should receive test results for the circuits worked on, not a verbal assurance. Keep them — they matter for insurance and at resale.

Get a quote

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