Why does my RCD keep tripping in Tredegar?
RCD keeps tripping in Tredegar? Common causes, what you can check safely and same-day diagnosis from a NICEIC engineer.
A short guide to fault diagnostics for Tredegar property, written by the person who would do the work. If you have had conflicting advice, it is usually because someone quoted without checking if the trip is on a shower or outdoor. Two electricians looking at the same readings tend to agree. If it turns out not to apply here, you will be told that plainly. Anything we recommend is tied to a specific finding rather than to a general principle. Around Blaenau Gwent County Borough Council that is a familiar finding rather than an alarming one. Owners and landlords across NP22 ask about this in roughly equal numbers, for slightly different reasons.
- Cable damage behind plaster Ask if you want it explained on site.
- Failed RCD itself (rare but happens) That is measured, not assumed.
- Frequently reported from NP22: damp in outdoor/bathroom circuits.
- Homeowners describe this as a fault; technically it is cable damage behind plaster.
- Failed RCD itself (rare but happens), especially on circuits that were extended rather than replaced.
What's different about Tredegar
Tredegar's exposed hilltop estates mean SPD surge protection on the consumer unit is a sensible spec, not a luxury — older RCDs lose sensitivity over time and trip on tiny earth leakage that a new device would tolerate. Ask if you want it explained on site.
If the trip is on a shower or outdoor circuit during rain, dampness is the likely culprit and the fix is usually IP-rated kit, not a board change. That is measured, not assumed.
Same-day diagnosis if you can't isolate it, which older installations in this area produce fairly regularly.
Unplug everything on the tripping circuit, reset the RCD. That is the finding, not the diagnosis.
How we'd do it
- 1IsolateWe if you can't isolate it, phone for diagnosis and explain what the numbers mean for the property.
- 2TestInsulation resistance test pinpoints the circuit. That is measured, not assumed.
- 3FixMost faults repaired on the visit: routine work, done properly rather than quickly.
- 4CallOne of the usual points: if you can't isolate it, phone for diagnosis.
Common questions
Why does testing take so long?
Because each circuit is measured individually. Cable damage behind plaster would be missed by a walk-round inspection.
Is a specialist needed or will any electrician do?
The work must be done by someone competent and registered. That is what the certification depends on.
Do you cover the surrounding villages?
Yes — Ebbw Vale and the rest of the NP22 area are on the same round as Tredegar.
What paperwork do I get?
The certification appropriate to the work, listing the circuits tested and the readings recorded, not a receipt with a tick on it.
Do you cover Tredegar for fault diagnostics?
Yes — Tredegar and the surrounding NP22 postcodes are part of our regular working area, including Ebbw Vale and Merthyr Tydfil, and Blaenau Gwent County Borough Council notification is handled by us where the work requires it. That detail is easy to verify.
How far in advance should I book?
For non-urgent work, a week or so gives the most choice of slots across NP22.
Booking is by phone or form; either way you speak to the person who would carry out the work. We cover Tredegar and the NP22 postcodes, including Merthyr Tydfil, for fault diagnostics. Describe what the property is doing and when it started. We will tell you whether it is urgent or plannable. We cover Tredegar and the NP22 postcodes, including Brynmawr, for fault diagnostics.