An electrical fault is any condition in which the wiring, fittings, or equipment in a circuit are not operating as intended. Faults range from straightforward problems — a circuit with no power, a socket that has stopped working — to intermittent issues that are harder to trace, such as an RCD that trips only when certain combinations of appliances are in use, or a lighting circuit that flickers under load.
Common fault types include open-circuit faults, where a break in a cable prevents current from completing its path; earth faults, where current leaks to the earthing conductor through damaged insulation; short circuits, where live and neutral conductors make unintended contact; and high-resistance connections at terminals that cause localised overheating without necessarily triggering the protective device immediately. Fault finding is a structured diagnostic process.
Before an electrician visits, it helps to note the specific circuits or fittings affected, whether the problem is constant or appears only under particular conditions, and whether any recent work has been carried out in the property — including plumbing, plastering, or DIY alterations. Avoid using extension leads to route power around a faulty circuit, as this may mask the underlying fault or place additional load on wiring that may already be compromised.
The electrician will isolate the affected circuit and use test instruments to measure insulation resistance, continuity, and earth loop impedance. These measurements narrow down whether the fault lies in the fixed wiring, a fitting, or a piece of connected equipment, and guide the physical search for the fault location.
Once found, the electrician will advise on the repair — from tightening a connection to replacing a section of cable.