Same-day attendance

Cardiff: how we fix rcd keeps tripping

Timescales are given honestly. If a part has to come, we say when rather than leaving it open. Around CF10–CF24 it is the single most common reason a job runs long.

If you are weighing up rcd keeps tripping at a Cardiff address, the useful starting point is the age and history of the wiring. A rcd keeps tripping in a Cardiff property is rarely mysterious once someone tests properly. Local housing here is largely Victorian and Edwardian terraces across Cathays and Roath, and that shapes both the likely findings and the realistic scope. Older installations around CF10–CF24 show this more often than newer ones.

The typical fault distribution in Cardiff Bay & city centre is dominated by many older cardiff properties still run on rewireable bs 3036 fuse boxes that no longer meet 18th edition requirements. The regulations move; installations do not. Part of the job is explaining which differences actually matter and which are simply age. The schedule of results records it either way. Rcd keeps tripping looks the same on every website. What differs is how it is scoped, and that is what this page is about.

Likely causes

Cumulative earth leakage from multiple circuits sharing one 30mA RCD — each circuit is fine alone but together they exceed the threshold.
A faulty heating element (immersion, shower, oven, dishwasher) leaking to earth.
Moisture in an outdoor socket, security light or garden circuit.
A failed neutral-to-earth connection inside an appliance.

How we fix it

We insulation-test to identify the leaking circuit, then trace to accessory or appliance. Where the board is a shared-RCD split-load design at end-of-life, we quote an RCBO upgrade so each circuit has its own dedicated protection.

Typical price: £95–£180 diagnosis + repair. RCBO board upgrade £550–£950 depending on circuit count.

When to stop and call

If you can't isolate a single circuit or appliance and the RCD trips within seconds of reset, call — it's a wiring fault, not an appliance.

Safe checks you can do first

Turn every MCB under the RCD off, reset the RCD, then bring circuits back one at a time to find the offending one.
On the offending circuit, unplug appliances one at a time.
Note whether it trips more often in wet weather — a strong clue for outdoor water ingress.

FAQs — rcd keeps tripping in Cardiff

Should I upgrade to RCBOs?+

If nuisance tripping is chronic and the board is 10+ years old, yes — RCBOs give per-circuit protection and eliminate the shared-threshold problem.

How long until you can attend?+

Same-day for genuine no-power situations; next-day for intermittent trips you can work around.

Cardiff context

Where previous work has no certification behind it, we test it rather than take it on trust. On Victorian and Edwardian terraces across Cathays and Roath it is worth ten minutes of anyone's time.

Get a written price — RCD keeps tripping in Cardiff

Send a short description and any previous certificate. We will say what testing is needed before we quote anything. We cover Cardiff and the CF10–CF24 postcodes, including Penarth, for rcd keeps tripping. You get one price, one electrician and one point of contact from first call to certificate.

Call 07949 398 752 Request a quote

In summary

Rcd keeps tripping covered across the CF10–CF24 postcodes, on the same rounds as the rest of the area. Written scopes mean you can compare us with anyone else on like-for-like terms. Anything we find that is outside this scope gets raised with you rather than added to the invoice.