EICR Testingin Leeds & West YorkshireCertified, Coded and Corrected

Testing is carried out with calibrated multifunction instruments, and the sequence matters. Dead tests come first: continuity of protective conductors and ring final circuit conductors, insulation resistance between live conductors and to earth, and polarity throughout. Only once the installation has passed those do we energise and carry out live testing: earth fault loop impedance at the origin and at circuit extremities, prospective fault current, and RCD trip timing at half, one and five times rated residual current, including the instantaneous test.

Every reading is written against its circuit on the schedule of test results, alongside the conductor sizes, protective device types and ratings, and the reference method for the installed cabling. That schedule is what makes the report auditable years later, and it is the part most often left blank on cheap certificates.

C1 means danger is present and there is a risk of injury: exposed live parts, for example. We make it safe immediately, with your permission, before leaving site. C2 means potentially dangerous: no immediate risk while everything stays as it is, but a fault or a moment of contact would create one. Missing earthing to a metallic accessory or an absent main protective bond are classic C2s.

C3 is an improvement recommendation. It does not make a report unsatisfactory and does not have to be actioned, though it is often worth doing while the board is open. FI means further investigation is required, usually because a symptom was found that cannot be diagnosed within the scope of the inspection: an unidentified circuit, a concealed junction, or a result that does not match the installed cable. FI makes a report unsatisfactory until the investigation is complete.

A domestic EICR typically covers a single-phase supply, one consumer unit and somewhere between six and sixteen circuits, and can usually be completed in a single visit with the power off in stages. Landlord reports follow the same technical scope but come with the documentation requirements attached to a tenancy.

Commercial premises bring three-phase supplies, sub-distribution boards, emergency lighting and fire alarm interfaces, and the need to phase testing around trading hours. Industrial sites add machinery, motor circuits, control panels, higher fault levels and sometimes hazardous areas, where isolation has to be planned with production rather than around it. On larger installations, inspection and testing is commonly sampled and phased across an agreed programme rather than completed in one shutdown: an approach normally handled under a fixed wire testing schedule.

Age of installation changes the work as much as the sector. Rewireable fuse boards, rubber or lead-sheathed cabling, no RCD protection on socket circuits, and boards without main switches all push an installation towards an unsatisfactory result, and the honest conversation on those properties is often about upgrade rather than repair.

Rented dwellings are generally inspected at least every five years or at change of tenancy. Owner-occupied homes are commonly recommended at ten years, and more often where the installation is older or has been altered. Offices, shops and similar commercial premises are typically every five years, and industrial premises every three, with shorter intervals for construction sites, agricultural and horticultural premises, swimming pools, caravan parks and public entertainment venues.

Those are starting points, not rules. The correct interval depends on the type of installation, its use, the external influences it is exposed to, the frequency of maintenance, and the age and condition found at the last inspection. We set and record the recommended next inspection date on the certificate for your specific installation.