Power trip at home: what to do

A power trip at home means a protective switch in your distribution board has cut the electricity, usually because of a faulty appliance, an overloaded circuit or a wiring problem. In an HDB flat or condo, the safe first steps are to find which switch tripped, unplug appliances on that circuit and try resetting once. If it trips again, stop and call a licensed electrical worker.

What a power trip is

Your home's distribution board, often called the DB box, contains switches that protect each circuit. When something goes wrong, the relevant switch turns off to cut the power. This is the system doing its job, so a trip is a warning, not just an inconvenience.

There are two main kinds of protective switch in most Singapore homes. Circuit breakers protect individual circuits from overload and short circuits. A residual current device, often still called an ELCB or RCCB, cuts power when it detects current leaking to earth, which can happen with a faulty appliance, damaged wiring or water getting into a fitting.

What to do first

Work calmly and safely. Do not touch the DB box with wet hands, and do not open its cover or remove any panel.

• First, look at the DB box and note which switch is down. Take a photo.
• Switch off and unplug appliances on the affected circuit, especially water heaters, kettles, ovens and washing machines.
• Reset the tripped switch once by pushing it fully back up.
• If it holds, plug appliances back in one at a time, waiting between each, to see which one causes the trip.
• If it trips immediately again, leave it off and call an electrician.

Do not keep resetting a switch that trips repeatedly, and never tape or hold it in the on position. EMA's electrical safety guidance explains why repeated tripping should be checked by a professional.

When it is not your flat

If the whole block, the corridor or neighbouring units have no power too, the problem may be outside your home. Check with neighbours, then contact SP Group for supply issues, or your Town Council or condo management for common-area power.

Common causes in Singapore homes

Water and electricity are a common combination in trips. Water heaters, washing machines and outdoor or corridor fittings exposed to rain often cause residual current trips. A trip that happens every time it rains is a strong clue that moisture is getting into a fitting.

Overloading is another frequent cause, especially in older flats where the kitchen circuit runs a microwave, kettle, oven and fridge together. Running several high-power appliances at once can trip a breaker. Spreading their use, or asking an electrician whether the circuits suit how you use the kitchen, can help.

Old or damaged wiring, loose connections and worn sockets can also cause trips and are more serious, because they can overheat. If you notice scorch marks, a burning smell, buzzing or a warm socket or switch, switch off at the DB box and call an electrician immediately.

What the electrician will do

An electrician will usually test the circuits and the suspect appliances to find the fault. This can involve insulation testing of the wiring and checking each appliance in turn. Tell them what tripped, when it happens and what you have already tried, and show them your photo of the DB box.

Electrical work must be done by a licensed electrical worker. EMA's guidance on engaging licensed workers explains how to engage one, and the licensed electrician guide explains what to check. In HDB flats, the HDB guidance on electrical works also applies to any changes.

Ask about the inspection or call-out charge before the visit. If the fault is in an appliance, the electrician may advise repair or replacement of the appliance rather than wiring work. If it is in the wiring, ask for a written quote for the repair. The electrical services guide explains how to compare quotes, and the urgent electrician guide covers after-hours help.

Reducing future trips

Keep a note of each trip: the date, the time, the weather, which switch went down and what was running. A pattern often points straight to the cause and saves the electrician time. Avoid running several high-power kitchen appliances at once on an older circuit, keep outdoor and corridor fittings dry, and replace appliances with damaged plugs or cords.

Power trip questions

Why does my power trip when I use the water heater?

The heater, its wiring or its isolator may have a fault, often involving moisture, which trips the residual current switch. Stop using the heater and ask a licensed electrical worker to test it. Do not open the heater or its isolator yourself.

Is it safe to keep resetting the circuit breaker?

No. One reset after unplugging appliances is reasonable. If the switch trips again, there is likely a fault that needs testing. Repeated resetting can hide a dangerous problem.

Why does my power trip when it rains?

Rainwater may be getting into an outdoor socket, a corridor light, aircon ledge wiring or another exposed fitting, causing current to leak to earth. Note which switch trips and ask an electrician to check exposed fittings.

Who do I call if the whole block has no power?

If neighbours and common areas are also affected, the issue is likely outside your flat. Contact SP Group for supply problems, or your Town Council or condo management for common-area power.