Residual current devices monitor the flow of electricity and cut off power instantly when they detect a leakage, such as current flowing through a person. RCD / RCCB / ELCB installation & testing is one of the most effective ways to prevent electric shock incidents.
Why It Matters
These devices, known by different names (RCD, RCCB, or ELCB) depending on the region, act fast, often within milliseconds, to prevent serious injury or death from electric shock. RCD / RCCB / ELCB installation & testing is especially important in areas with water exposure, such as kitchens, bathrooms, and outdoor sockets.
What to Expect During the Process
- Assessment – The electrician reviews your current distribution board and identifies circuits that need RCD protection.
- Device Selection – An RCD, RCCB, or ELCB with the correct sensitivity rating is chosen.
- Installation – The device is fitted into the distribution board, usually protecting one or more circuits.
- Wiring Connection – Circuits are connected through the device to ensure it monitors current flow correctly.
- Functional Testing – The electrician presses the test button on the device to confirm it trips as expected.
- Documentation – A record of the test results is provided for future reference.
Expect the electrician to recommend testing the device every few months using its built-in test button, even after professional installation.
Common Mistakes to Avoid
Avoid devices with the wrong sensitivity rating, as this can cause nuisance tripping or fail to detect small leakages. Skipping the functional test after installation is also a common shortfall.
Estimated Cost of RCD / RCCB / ELCB Installation & Testing
| Service | Estimated Cost (KES) |
|---|---|
| Single RCD/RCCB/ELCB installation | 5,000 – 12,000 |
| Multiple device installation (per unit) | 4,000 – 10,000 |
| Functional testing only | 2,000 – 5,000 |
| Full distribution board RCD upgrade | 20,000 – 40,000 |
Prices vary based on device brand, sensitivity rating, and number of circuits covered.
RCD / RCCB / ELCB installation & testing is a life-saving addition to any home's electrical system. Make it a habit to test these devices regularly using the built-in test button to confirm they are working correctly.