RCCB Installation

Need help installing a RCCB for your DB Box? Or do you need to replace your faulty RCCB?

RCCB Installation in Singapore

Residual Current Circuit Breakers (RCCBs) are vital safety devices required in all homes. They instantly cut off electricity if they detect excessive current leakage, protecting against electric shocks and fires.

These devices monitor the flow of electricity, identifying imbalances between incoming and outgoing currents to detect potential leaks.

Why Install RCCBs?

Installing RCCBs is essential to meet safety standards and prevent accidents. They safeguard against electric shocks and fires caused by current leakage, ensuring the well-being of household occupants.

Causes and Signs of Current Leakage

Causes of current leakage include old or faulty circuit breakers, poor electrical wiring, aging or exposed wires, faulty electrical appliances, and damaged insulation. 

Signs of current leakage include frequent tripping of circuit breakers, flickering lights, and appliances overheating.

Mandatory RCCB Installation in Residential Properties

Since July 1985, RCCBs have been mandatory in all residential properties constructed in Singapore. Properties undergoing renovations or electrical rewiring post-1985 must also install RCCBs to comply with regulations.

However, there remains a small percentage of residential premises built before July 1985 which may be using their original electrical circuits without an RCCB installed.

Recent Mandate by Energy Market Authority (EMA)

On July 1, 2023, the EMA mandated the installation of at least one 30mA sensitivity RCCB in all domestic electrical installations. Homeowners have until July 1, 2025, to comply with this mandate.

Types of RCCBs

RCCBs come in two types: two-pole for single-phase circuits and four-pole for three-phase circuits.

They detect minor variations in residual current and immediately disconnect the electrical supply when abnormal current levels are detected.

How RCCBs Function

RCCBs continuously monitor and compare current values between live and neutral wires. They operate based on Kirchhoff’s Current Law, ensuring any residual current remains within permissible tolerance levels, typically set at 30mA. They will cut off the electricity supply immediately upon the detection of current leakages that may lead to an electric shock. 

Testing RCCBs

Periodic testing is essential to ensure RCCBs are in good working condition. Pressing the test button should cause the RCCB to trip, indicating it is functional and working properly.

If homeowners suspect the RCCB to be faulty, they should engage a qualified electrician to conduct further checks, and have it replaced immediately. 

Testing the RCCB switch – Step 1 (Photo: EMA)

Preparation: Switch off all your electrical appliances to protect them before testing your RCCB.

Step 1: Test the RCCB by pressing the blue TEST button. The RCCB switch will flip down, cutting off all power supply in your home (and to all appliances, etc).

Testing the RCCB switch – Step 2 (Photo: EMA)

Step 2: Test all light switches and power sockets in every room. The RCCB is working if your lights and appliances do not turn on.

IMPORTANT: If any light or power socket or appliance continues to work when the RCCB switch is flipped down, your house is not fully protected by the RCCB. Contact a Licensed Electrical Worker immediately.

Testing the RCCB switch – Step 3 (Photo: EMA)

Step 3: Switch off all lights and power sockets. Flip up the RCCB switch to restore the power supply. Lastly, switch on lights and appliances that you need.

Consequences of Non-Compliance

Residential premises (i.e. HDB flats and private residences) must install an RCCB within the 2-year grace period from the effective date of the requirement, 1 July 2023. 

Those found without RCCBs will receive a written warning and must install the device within an additional eight weeks.

The penalty for non-compliance is a fine of up to $5,000 under the Electricity (Electrical Installations) Regulations.

Repair or replace any malfunctioning RCCBs promptly to maintain electrical safety in the household.

Enhancing Home Safety

RCCB installation is critical for safeguarding homes against electric shocks and fires. Compliance with Singapore’s regulations and regular testing ensure optimal functionality, providing peace of mind for local homeowners.

For the safety of you and your family, contact us today. Our trusted electrician can help install a new RCCB for your old DB Box, or replace your faulty RCCB if it is not working properly.


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