Have you ever woken up in the middle of the night to find the power’s out — and your RCCB has tripped? This is more common than you think in Singapore, especially in older homes and HDBs where insulation and humidity issues can cause intermittent faults.
In this blog, we explain why your RCCB might trip at night, what appliances are often to blame, and how to fix it the right way.
🌙 Common Causes of Night-Time RCCB Tripping
- **Storage or Instant Water Heaters**: Many of these are set to heat up during off-peak hours at night. If there’s even minor leakage inside, it can cause the RCCB to trip.
- **Humidity and Condensation**: Cooler night temperatures can cause moisture buildup in outdoor wiring or poorly insulated circuits.
- **Appliances on Night Cycle**: Fridges, freezers, and washing machines often run auto-defrost or timer functions overnight, and a fault in any of them can trigger a trip.
- **Old Wiring or Improper RCCB Setup**: Aging insulation or lack of proper RCCB selectivity can cause non-critical circuits to trip unnecessarily.
🤔 FAQs from Homeowners
Q1: Why doesn’t it trip during the day?
Some appliances are only active at night. Also, cooler air at night leads to condensation on wiring, especially near service yards or outdoor DB boxes.
Q2: Is the RCCB defective?
Not necessarily. Your RCCB may be doing its job by cutting power when it detects even a small leakage current. We test it before recommending a replacement.
Q3: Can I fix this myself?
It’s not safe to guess. A Licensed Electrical Worker (LEW) must test your system with proper tools like insulation resistance testers and fault-tracing meters.
🛠 How We Fix It
At Competent Electrician Pte Ltd, we offer a full RCCB fault tracing and diagnostic service that includes:
- RCCB load testing and insulation resistance checks
- Appliance-by-appliance leakage testing
- DB box review and proper RCCB/MCB setup
- SP submission and upgrade (if needed)
- LEW-certified fault report for your records
📍 Competent Electrician Pte Ltd
📞 +65 6690 3358
🌐 https://competent-electrician-sg.com
