RCD Safety Switch Testing

An RCD (Residual Current Device), also called a safety switch, is a life-saving electrical device that instantly cuts power when it detects electricity leaking to earth—such as through a person receiving an electric shock. RCDs monitor the electrical current flowing through the active (live) and neutral wires. If there's even a tiny imbalance (as little as 30 milliamps), the RCD trips within 30 milliseconds, preventing serious injury or death. They're mandatory in Australian workplaces under WHS legislation.

Professional RCD testing should be conducted every 6 months for commercial and industrial premises according to AS/NZS 3760 and SafeWork NSW recommendations. High-risk environments like construction sites may require more frequent testing (every 3 months).

While you should press the test button on your RCD monthly as a basic check, this doesn't verify the critical response time. Only professional testing with calibrated equipment can confirm your RCD will trip within the required 30 milliseconds during a real electrical fault. Regular testing also identifies degrading components before complete failure occurs.

Unfortunately, no. Proper RCD testing requires the device to be tripped multiple times to verify it functions correctly and within the required response time. This means brief power interruptions to the circuits protected by each RCD being tested—typically only a few seconds per test.

However, we work efficiently and can schedule testing during off-peak hours, lunch breaks, or after business hours to minimize disruption. For businesses that can't tolerate any power interruption, we can coordinate with your electrician to arrange temporary backup power or circuit modifications. Most businesses find the brief interruption worthwhile given the life-safety critical nature of RCD protection.

If an RCD fails our testing (trips too slowly, doesn't trip at the correct current, or doesn't trip at all), we'll immediately tag it as non-compliant and recommend urgent replacement by a licensed electrician. A failed RCD leaves your workplace unprotected against electric shock and poses a serious safety risk. We'll provide a detailed report documenting the failure and can recommend qualified electricians if needed. Most RCDs can be replaced quickly, and we can return to retest the new device once installed. Never continue using a failed RCD—it's a life-safety issue.