A practical guide to the parts of an Electrical Installation Certificate that matter most on site, with a simple way to keep the form complete, legible, and ready to hand over.
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Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.
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A strong Electrical Installation Certificate should tell the story of the job without making the client guess. It needs the installation address, the person responsible for the work, the scope of the work, the circuit details, and the test results that support the certificate.
If the job involved new circuits, alterations, or a board change, the certificate should make that obvious. It should not read like a generic form that could apply to any job on any day.
Use the certificate to record the actual work carried out, not just the headline description. Specific wording makes handover easier and reduces questions later.
Every key change in the 2026 amendment on one page. AFDDs, TN-C-S protection, new schedule columns, model forms. Pinned on your van dash.
BS 7671:2018+A4:2026 Reg 444.4.3.1 states that a PEN conductor shall not be used downstream of the origin of the installation. This aligns with the statutory prohibition in Regulation 8(4) of the Electricity Safety, Quality and Continuity Regulations (ESQCR). On every EIC, the installer must record that no PEN conductor is present downstream of the origin, to demonstrate compliance.
The majority of domestic properties in the UK are supplied via a TN-C-S (PME) earthing arrangement where the DNO provides a combined PEN conductor up to the service head. The consumer installation downstream must use separate PE and N conductors. BS 7671 Reg 543.4.2 requires that whether or not a PEN conductor is present in the consumer installation is recorded on the EIC or EICR. A certificate that omits this declaration is incomplete under A4:2026.
If you need the test-record side to make sense step by step, the schedule of test results page is a useful companion.
The customer does not want a wall of unexplained numbers. They want to know that the work has been completed, the installation has been checked, and the certificate matches the job they paid for. Plain wording is usually better than overcomplicated language.
If the job is part of a bigger quote, keep the certificate aligned with the scope that was agreed. That is where a clean electrical quoting workflow helps because the job description and the paperwork stay in step.
An EIC is usually the right document when the work is more than a small repair. New circuits, substantial alterations, a consumer unit change, or a wider installation upgrade normally need the certificate to reflect that bigger scope.
An EIC must not be used for periodic inspection and testing. If the job is a condition report on an existing installation, an Electrical Installation Condition Report (EICR) is required instead (BS 7671 Reg 120.3). Issuing an EIC in that situation is a common error on site-generated paperwork and is not compliant.
If you are still checking whether the job should be an EIC or something lighter, the when an EIC is required guide is the safest starting point.
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If any part of the installation deviates from the requirements of BS 7671, that deviation must be formally recorded on the certificate as a Departure. The designer must include a declaration that the resultant degree of safety is not less than that achievable by full compliance with the Regulations (BS 7671 Reg 133.1.2; GN3 Reg 1.5).
A Departure field left blank does not mean there are no departures — it means none have been assessed. Any deviation, however minor, must be identified, justified, and signed off by the designer. This is one of the most frequently overlooked sections on EICs generated outside a proper workflow.
Section D of the EIC requires the designer to recommend a re-inspection interval — entered in years and months — by which the installation should be inspected and tested again (BS 7671 Reg 120.3). The proposed interval should take into account the type of installation, its use, and expected maintenance frequency.
A missing or blank Section D is a common deficiency on site-generated certificates. The Regulation requires the recommendation to be present; leaving it empty means the certificate is incomplete. Fill in a realistic interval based on the installation type — domestic work commonly carries a 10-year recommendation, though lower-risk periods apply for commercial and industrial premises.
The best paperwork is the paperwork that matches the actual site visit. If the certificate, the readings, and the quotation all live in different places, mistakes creep in. Keep the notes, the price, and the handover close together so the job is easier to finish and easier to explain.
For larger upgrades, the consumer unit upgrade guide and consumer unit upgrade cost guide help you keep the scope and the certificate aligned.
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