Why does my outside socket trip the RCD – Advice from Electriman, North London Electricians

## Why Your Outside Socket Keeps Tripping the RCD

An RCD (Residual Current Device) is a safety switch in your consumer unit (fusebox) that cuts power within milliseconds when it detects electricity leaking to earth — the kind of leak that can kill. When your outdoor socket causes it to trip, that is the RCD doing exactly what it should.

### What causes it?

- **Moisture or water inside the socket** — outdoor sockets must be IP-rated (weatherproof), and if the cover is cracked, missing, or left open in rain, water gets in and creates a leakage path to earth

- **A faulty appliance** — a lawnmower, pressure washer, or extension lead with damaged insulation will cause an immediate trip

- **Damaged cable** — the cable feeding the outdoor socket may have been cut by a spade, gnawed by rodents, or degraded over time

- **A loose or corroded connection** — connections inside the socket box can corrode outdoors, especially if the socket is not properly sealed

- **Wiring fault from a previous DIY job** — non-compliant wiring installed without proper protection or the correct cable type

### What you can safely check yourself

1. **Unplug every appliance** from the outdoor socket

2. **Go to your consumer unit** and reset the RCD

3. If it **stays on**, plug appliances back in one at a time to identify the faulty one — discard or have it repaired

4. If it **trips immediately** with nothing plugged in, there is a wiring or socket fault

5.

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Electriman covers Mill Hill, Barnet, Finchley, Edgware, Enfield, Watford and surrounding areas. All work is Part P certified and fully insured.