Same-day attendance

Fuse box keeps tripping — Newport diagnostic visit

A fair amount of this work is preparation: confirming fuse box keeps tripping, planning the route, agreeing what happens if something unexpected appears behind the plaster. We would explain the same thing on site, just with the board open.

Here is how fuse box keeps tripping works in practice for a property in Newport, start to finish. We insulation-resistance test each circuit under the RCD, isolate the faulty one, then trace the fault to the exact accessory or cable. Nothing is charged for on the basis of a guess. Where a reading is borderline, it is reported as borderline. On Victorian terraces around Maindee and Pill it is worth ten minutes of anyone's time.

The typical fault distribution in Newport is dominated by newport's mix of maindee/pill terraces with rewireable boards and modern glan llyn new-builds means quotes vary sharply by postcode — a survey almost always changes the number. Questions asked during the visit get answered during the visit; there is no benefit to either of us in keeping it mysterious. Around NP10–NP20 it is the single most common reason a job runs long. Fuse box keeps tripping: what is involved, what it depends on, and what we would check first at a NP10–NP20 address.

Likely causes

A faulty appliance dumping current to earth — kettles, washing machines and immersion heaters are the usual suspects.
A shared RCD tripping because two circuits together exceed the 30mA leakage threshold, even when each is fine on its own.
Water ingress into an outside socket, garden light or shed circuit after heavy rain.
A worn RCD at end-of-life — 15+ year-old devices lose sensitivity and false-trip.

Safe checks you can do first

Unplug everything on the tripping circuit, reset, then plug items back in one at a time.
Check whether the trip happens at the same time each day (immersion timer, storage heater).
Look for scorch marks, warmth or a burnt smell around sockets before touching anything.

When to stop and call

If the RCD won't reset with everything unplugged, or you smell burning, isolate the main switch and call.

How we fix it

We insulation-resistance test each circuit under the RCD, isolate the faulty one, then trace the fault to the exact accessory or cable. Most faults are found and made safe on the first visit; a full RCBO board upgrade is quoted only if the whole board is at end-of-life.

Typical price: £95–£180 for diagnosis + first-visit fix on a single fault. Board upgrades quoted separately if needed.

FAQs — fuse box keeps tripping in Newport

Is a tripping RCD dangerous?+

The trip itself is the safety device doing its job. What's dangerous is repeatedly resetting a trip without finding the cause — that's how socket fires start.

How long does diagnosis take?+

Most single-fault diagnoses are done inside an hour. Intermittent faults that only appear at certain times can take a return visit.

Can I keep resetting it until you arrive?+

No. If it won't hold, leave it off and turn on the circuits you actually need one at a time. Don't force the RCD closed.

Newport context

Newport properties near Cwmbran are covered on the same schedule, so a joint visit is often possible if a neighbour needs the same thing. For Victorian terraces around Maindee and Pill that detail matters more than it does elsewhere.

Arrange a test and certificate — Fuse box keeps tripping in Newport

Let us know your preferred access times — tenanted property in Newport is arranged around the tenant, not around us. We cover Newport and the NP10–NP20 postcodes, including Risca, for fuse box keeps tripping. If you have quotes already, send them. We will explain what the differences between them actually mean.

Call 07949 398 752 Request a quote

In summary

Fuse box keeps tripping — planned around access rather than around us, which suits tenanted property. Nothing gets replaced because it looks old. It gets replaced because it fails a test. There is no benefit to us in recommending work that testing does not support, and plenty of downside.