Is it safe to keep resetting a tripping RCD?

Resetting once to test is fine. But if it keeps tripping, stop -- the switch is detecting a real earth leak. Repeatedly forcing it back on defeats the protection that stops you being electrocuted.

Can I fix a tripping safety switch myself?

You can isolate a faulty appliance by unplugging things one at a time. You cannot legally or safely work on the wiring or the switchboard -- that must be a licensed electrician in every Australian state and territory.

Why does my RCD only trip when it rains?

Moisture getting into outdoor power points, garden lighting, or a damaged external cable lets current leak to earth. It often resets once things dry out, but a circuit that trips every time it rains has a fault worth having checked.

Why does my RCD (safety switch) keep tripping?

An RCD trips when current leaks to earth. How to isolate the cause safely, and when it becomes a licensed electrician job.

Quick answer

An RCD (safety switch) trips when it detects current leaking to earth -- usually a faulty appliance, moisture in a circuit, or a damaged cable. Unplug everything on the affected circuit and reset; if it holds, plug items back one at a time to find the culprit. If it trips with nothing plugged in, the wiring itself needs a licensed electrician. Never bypass or tape an RCD closed.

Skill level: All levels
Time: 4 min read
Trade: Electrical
Updated: 14 November 2026

The short answer

A tripping RCD is doing its job: it cuts power in milliseconds when it senses current escaping to earth, which is what protects you from a fatal shock. The trip is a symptom, not the fault -- something is leaking, and the switch is telling you before it hurts someone.

The fastest way to isolate it: turn off every appliance on the dead circuit, reset the RCD, then switch appliances back on one at a time. The one that trips it again is your leak. A common culprit is a kettle, iron, fridge, or outdoor lead that has taken on moisture.

What it depends on

Whether it trips instantly or only under load -- instant trips often point to wiring or a fixed appliance; load trips often point to a heating element.

Weather -- outdoor circuits and garden lights commonly trip after rain until they dry out.

Age of the installation -- nuisance tripping can come from an old RCD near the end of its life, or from too many circuits sharing one safety switch.

Whether it trips with nothing plugged in -- that rules out portable appliances and points to fixed wiring, which is licensed-electrician territory.

Your next step

If the RCD holds once a suspect appliance is unplugged, you have found your fault -- repair or replace that appliance. If it keeps tripping with everything off, or trips instantly the moment you reset it, stop there: that is a wiring fault, and in Australia electrical wiring must be worked on by a licensed electrician. It helps to understand your board first -- see understanding your switchboard -- and browse more electrical guides.

Frequently asked questions

Is it safe to keep resetting a tripping RCD?: Resetting once to test is fine. But if it keeps tripping, stop -- the switch is detecting a real earth leak. Repeatedly forcing it back on defeats the protection that stops you being electrocuted.
Can I fix a tripping safety switch myself?: You can isolate a faulty appliance by unplugging things one at a time. You cannot legally or safely work on the wiring or the switchboard -- that must be a licensed electrician in every Australian state and territory.
Why does my RCD only trip when it rains?: Moisture getting into outdoor power points, garden lighting, or a damaged external cable lets current leak to earth. It often resets once things dry out, but a circuit that trips every time it rains has a fault worth having checked.

Written by Sparky, the Electrical specialist at Aus.Tools.