RCCB and ELCB inspection, testing, installation and replacement for Singapore properties

Residual-current protection for your electrical installation

An RCCB, also commonly associated with the older term ELCB, is a protective device that disconnects the electricity supply when it detects current leakage. It helps reduce the risk of electric shock caused by conditions such as damaged insulation, exposed wiring, faulty appliances or moisture entering electrical equipment.

We assess RCCB and ELCB concerns in homes and business premises, including missing protection, devices that will not operate using the test button, physical damage and repeated tripping. The device is normally located in the distribution board, but its arrangement and the circuits it protects vary between properties.

When to arrange an assessment

• The property appears to have no RCCB or ELCB
• The test button does not disconnect the supply
• The device trips repeatedly or will not reset
• The board shows heat, moisture or mechanical damage
• Renovation or rewiring changes the circuit arrangement
• An inspection identifies inadequate residual-current protection

Why an RCCB may keep tripping

Repeated tripping does not automatically mean the RCCB is defective. The device may be responding correctly to leakage from an appliance, damaged cable, wet fitting or deteriorated insulation. There can also be problems with connections, circuit arrangements or the protective device itself. Testing is required to distinguish these possibilities.

If there is no smoke, heat, burning smell, water or visible damage, you can switch off and unplug portable appliances before attempting one reset. Stop if the RCCB trips again. Do not hold the device on, bypass it, replace it with another rating or remove the distribution-board cover.

Information that helps fault finding

Note whether the whole property loses power, which circuits were in use and whether the trip follows operation of a particular appliance. Weather, leaks and recent electrical work may also be relevant. Our power trip repair service covers systematic tracing when the cause is not obvious.

RCCB testing, installation and replacement

An assessment starts with the distribution board, existing protective devices and the circuits served. The electrician checks the device arrangement and carries out appropriate tests. If replacement or installation is required, the selected device must be suitable for the installation and coordinated with the other protection in the board.

A new RCCB should not be treated as a substitute for repairing faulty wiring. If testing identifies leakage or insulation problems, those defects need to be addressed. Where the existing board lacks space, is damaged or has broader problems, the recommendation may involve distribution board work rather than an isolated device change.

After the work

The device and relevant circuits are checked before handover. We identify the test button and explain routine user testing. Owners should keep the board accessible and clearly labelled so circuits can be identified during future maintenance or emergencies.

Current RCCB requirements in Singapore

EMA states that all residential premises must have an RCCB or ELCB with a rated residual operating current not exceeding 30mA sensitivity. Its electrical safety guidance explains how to identify the device, advises monthly testing and describes what homeowners should do if protection is missing.

Electrical repair or replacement work on consumer control units and circuit breakers should be handled by a Licensed Electrical Worker of the appropriate class. EMA’s consumer guide to Licensed Electrical Workers provides current licence information and a route to verify workers.

Do not wait when there are danger signs

Arrange urgent assistance if the board is smoking, sparking, wet, making loud buzzing sounds or producing a burning smell. Keep away and isolate the main supply only if it can be reached safely. Do not continue operating a damaged board because the property still has some power.

Our RCCB and ELCB service process

1. Understand the symptoms

We ask when the device trips, which circuits and appliances are affected, and whether there has been water ingress, renovation or recent electrical work.

2. Inspect and test

The electrician assesses the distribution board, protective device and relevant circuits. Testing helps determine whether the RCCB is responding to a downstream fault or has a problem of its own.

3. Explain the required work

The recommendation may be an appliance check, wiring repair, RCCB replacement or broader board work. We explain the basis of the proposed scope rather than replacing the device automatically.

4. Complete checks and handover

After authorised work is completed, the affected installation is checked and the owner is shown the test control and relevant circuit labels.

For broader protection issues, visit our circuit breaker service. For deteriorated cables or renovation-related changes, see our electrical rewiring service.

Routine RCCB checks for owners and occupants

EMA advises residential users to press the RCCB test button monthly. Before doing so, save computer work and be prepared for the electricity supply to disconnect. A successful test should trip the device; restore it using the normal operating control. If the test button does nothing, the device will not reset, or its operation is unclear, arrange assessment by a Licensed Electrical Worker rather than opening the board.

The user test confirms that the tripping mechanism responds, but it is not a complete inspection of wiring, earthing or every protective device. It also does not prove that appliances are fault-free. Owners should combine routine testing with attention to warning signs such as shocks or tingling sensations, repeated trips, damaged leads, warm outlets, water ingress and burning smells.

Prepare for a tripping investigation

Make a simple list of what was running immediately before the trip, including water heaters, air-conditioners, kitchen appliances and outdoor equipment. Note whether rain, cleaning, a leak or recent renovation may be relevant. Do not repeatedly energise a circuit to reproduce a dangerous symptom. Leave suspect appliances unplugged and provide the electrician with access to the distribution board and affected areas.

For businesses or occupied properties, advise users that testing may interrupt power and identify equipment that needs a controlled shutdown. After work, keep the board unobstructed and preserve updated labels and service records. If the RCCB trips again, record the circumstances and seek follow-up rather than assuming the previous fault has returned; a different appliance or circuit condition can produce the same visible result.

Tenants should know where the board is located and how to contact the owner or manager, but should not dismantle or modify it.