Your HDB flat's power has just tripped. The lights are out, the aircon has stopped, and the fridge is ticking. Do not panic. This is one of the most common household issues in Singapore, and the path to getting your power back is straightforward once you know who to call and what steps to take.
This guide is specifically for HDB homeowners dealing with power trips. It covers the immediate response, how to determine whether you need SP Services or a private electrician, and what to expect when help arrives.
First steps when your HDB power trips
Before reaching for the phone, take these quick steps to assess the situation.
Check whether the outage is just your flat. Look out your window or step into the common corridor. If your neighbours' lights are on, the issue is most likely internal to your flat.
Open your DB box. It is usually a grey metal panel near your front door. Look for a switch that has moved to the middle position or the off position. That is your tripped breaker. For a detailed explanation of what is inside your DB box, see our guide on understanding your HDB circuit breaker box.
Try a basic reset. Switch off all appliances first. Then push the tripped breaker firmly to off, then back to on. If it holds, reconnect appliances one at a time to identify what caused the trip. For more on this process, see our article on circuit breaker tripping: causes, fixes, and when to worry.
Note any warning signs. Burning smells, scorch marks on outlets, warm spots on walls, or a breaker that trips immediately after reset are all signs that the issue needs professional attention.
SP Services vs electrician: who handles what
This is the most common point of confusion during an HDB power trip. Here is the clear distinction.
SP Services handles supply-side issues
SP Services is responsible for the electricity supply network up to and including your electricity meter. Call them at 1800-778-8888 if:
- The entire block or floor has lost power
- Your DB box shows no tripped breakers, but you have no power
- You notice damage to external electrical infrastructure
- Your electricity meter appears faulty
SP Services will investigate at no charge. If the fault is on their side, they will repair it. If the supply is fine, they will advise you to contact a private electrician.
An electrician handles internal faults
A private electrician handles everything from your DB box inward. Call an electrician if:
- A breaker in your DB box has tripped
- Only your flat is affected while neighbours have power
- You have a burning smell, sparking, or scorching from outlets
- Your breaker keeps tripping after reset
- You need the issue resolved outside SP Services' scope
For HDB power trip emergencies, our 24-hour emergency electrician service provides rapid response. For HDB-specific power outages, our HDB power outage emergency services are equipped to handle the common faults found in HDB electrical systems.
How to check if it is a supply or internal issue
Use this quick decision tree.
Neighbours have power? Your DB box shows a tripped switch? Internal fault. Call an electrician.
Neighbours have power? No switches tripped in your DB box? Could be supply-side (meter or incoming cable). Start with SP Services.
Neighbours also have no power? Area-wide outage. Call SP Services.
Partial power in your flat? Some rooms working, others not? Individual MCB has tripped. Internal fault on that specific circuit. Call an electrician if reset does not hold.
For more on how to isolate the cause of repeated trips, see our guide on why your electricity keeps tripping and how to stop it.
What an electrician will do when they arrive
Knowing what to expect helps you assess whether the work is reasonable and properly conducted.
Step 1: Visual inspection of the DB box. The electrician will examine the DB box for signs of damage, overheating, or loose connections.
Step 2: Circuit testing. Using a multimeter and insulation resistance tester, the electrician will test each circuit to identify the one with the fault. This involves measuring resistance and checking for earth leakage.
Step 3: Fault isolation. Once the affected circuit is identified, the electrician will systematically test sections of that circuit to pinpoint the exact location of the fault, whether it is in the wiring, at an outlet, or in a connected appliance.
Step 4: Repair. Depending on the fault, the repair might involve replacing a faulty MCB or RCCB, repairing or replacing a damaged outlet, tightening loose connections, or in some cases, recommending further work like rewiring a section.
Step 5: Testing and certification. After the repair, the electrician will test the circuit to confirm the fault is resolved, check the RCCB trips correctly, and ensure all connections are secure.
A straightforward diagnosis and repair typically takes 30 minutes to 1 hour. More complex issues, especially intermittent earth leakage faults, may take longer. For a broader overview of what electricians in Singapore do, see our service guide.
Preventing future power trips in your HDB
Once your immediate power trip is resolved, these measures reduce the chance of it happening again.
Spread your load across circuits. Do not run multiple high-power appliances on the same circuit. If your HDB flat has limited circuits, consider adding dedicated circuits for heavy-draw appliances like air conditioners and water heaters.
Test your RCCB monthly. Press the test button on your RCCB. It should trip immediately. If it does not, have it checked by an electrician.
Maintain your appliances. Appliances with worn power cords, damaged plugs, or internal faults are common trip causes. Replace damaged cords promptly and have appliances serviced according to their maintenance schedule.
Get older wiring inspected. If your HDB flat is more than 20 years old and the wiring has never been inspected, a professional assessment can identify degrading insulation before it causes repeated trips. Make sure you understand the HDB electrical work requirements before planning any upgrades. For a broader guide that covers condos and landed properties as well, see what to do when your power trips in Singapore.
Avoid daisy-chaining extension cords. Plugging one extension cord into another increases resistance and fire risk. Use a single appropriately rated power strip for multiple low-power devices.
Frequently Asked Questions
Do I call SP Services or an electrician for HDB power trips?
The right person to call depends on where the fault lies. SP Services handles the electricity supply network up to the point where it enters your HDB flat. This means they deal with area-wide outages, damaged supply cables, faulty electricity meters, and problems with the incoming supply. Their 24-hour emergency number is 1800-778-8888.
A private electrician handles everything from your DB box inward. This includes tripped circuit breakers, faulty wiring inside your flat, sparking or burning outlets, and appliance-related electrical faults. The quickest way to determine who to call is to check your DB box. If you find a tripped breaker, the problem is internal and you need an electrician. If no breakers have tripped but you still have no power, check whether your neighbours have power.
If the whole block or floor is affected, call SP Services. If only your flat is dark while neighbours have power and no breakers are tripped, the issue could be at the incoming supply or meter, so start with SP Services. A common mistake is calling SP Services for internal faults, which wastes time since they cannot and will not work on your internal wiring.
How quickly can an electrician respond to a power trip?
Response times for power trip call-outs in Singapore vary depending on the time of day and the electrician's workload. During normal business hours (roughly 9am to 6pm on weekdays), most electricians can arrive within 1 to 3 hours of your call. For after-hours, weekend, and public holiday call-outs, response times may be longer, typically 1 to 4 hours, though 24-hour emergency services aim to respond faster.
The actual time on site to diagnose and fix a power trip is usually 30 minutes to 1 hour for straightforward issues like a faulty MCB or a tripped RCCB caused by an identifiable appliance. More complex problems involving wiring faults or intermittent earth leakage may take longer.
When you call, providing clear information helps speed things up. Tell the electrician whether the whole flat is out or just part of it, which breaker tripped (MCB or RCCB), whether you smell burning or see scorch marks, and whether you have already tried resetting. Our emergency electrician services prioritise rapid response for HDB power trips.
What causes power trips specifically in HDB flats?
HDB flats have some characteristics that make them more prone to certain types of power trips. Older HDB flats (built before the 2000s) often have fewer circuits than what modern appliance usage demands. A typical 1980s or 1990s HDB flat might have only 6 to 8 circuits, which means more appliances share each circuit. This increases the likelihood of overload trips.
Wiring age is another HDB-specific factor. Many HDB flats still have their original wiring from 20 to 40 years ago. The PVC insulation on these cables degrades in Singapore's heat and humidity, leading to earth leakage that trips the RCCB or ELCB. This kind of degradation is gradual and may only manifest as occasional tripping at first, becoming more frequent over time.
HDB flats also have specific RCCB and ELCB configurations. Older flats may have a single ELCB covering all circuits, meaning any earth leakage on any circuit trips the entire flat. Newer configurations use RCCBs that may cover groups of circuits, limiting the impact.
Is there a charge for SP Services power trip investigation?
SP Services does not charge for investigating supply-side electrical issues that affect your HDB flat. If you call their 24-hour emergency hotline (1800-778-8888) and the problem turns out to be on their side of the supply, the investigation and repair are handled at no cost to you.
However, if the SP Services technician determines that the issue is internal to your flat, they will advise you to contact a private electrician. You will not be charged for the SP Services visit in this scenario either, but you will then need to pay a private electrician for the diagnosis and repair of your internal system.
It is worth noting that SP Services' scope is strictly limited to the supply network and metering. They will not open your DB box, test your circuits, or repair any part of your internal wiring. This is why it is useful to check your DB box yourself before calling.
Can I fix an HDB power trip myself?
You can safely perform some basic troubleshooting steps, but there are clear limits to what you should attempt. Safe DIY steps include resetting a tripped breaker, identifying a faulty appliance by unplugging devices and reconnecting them one at a time, and checking whether the issue is supply-side by seeing if your neighbours have power.
What you should not do includes opening the DB box beyond the cover panel, touching any wiring or connections inside the DB box, replacing a circuit breaker or fuse yourself, or attempting to bypass a tripping breaker. Under the Electricity Act, any electrical installation work in Singapore must be performed by a Licensed Electrical Worker (LEW).
If your basic troubleshooting does not resolve the trip, contact a licensed electrician. See our guide on understanding your HDB circuit breaker box for more on what is inside your DB box.
What if my power trips at night: is there 24-hour service?
Yes, 24-hour electrical services are available in Singapore for HDB power trips that happen outside normal business hours. Both SP Services and private electricians offer round-the-clock emergency response.
After-hours service does come with additional cost. Most electricians charge a surcharge of 50 to 100 per cent on top of their standard rates for call-outs between 6pm and 9am, on weekends, and on public holidays. For a night-time power trip, the total cost including diagnosis and a simple repair might range from S$150 to S$400.
Whether to call at night or wait until morning depends on the situation. If the entire flat is without power, if there is a burning smell, or if someone in the household has medical equipment that needs power, calling for immediate help is justified. If only one circuit is affected and you can manage through the night, waiting saves on the surcharge. Our emergency electrician services provide 24-hour response across Singapore.
Getting help fast
An HDB power trip is stressful but manageable. The key is making the right call quickly: SP Services for supply issues, a private electrician for internal faults.
Save both numbers in your phone now, before you need them. For internal electrical emergencies, our emergency electrician service and HDB power outage emergency services provide rapid diagnosis and repair to get your power back on safely. For guidance on what constitutes a true emergency, read our guide on when to call an emergency electrician in Singapore. See our pricing page for transparent rates before any work begins.
For ongoing issues with tripping, our electrical troubleshooting services can identify the root cause and recommend a lasting fix.
