Straight answers on the paperwork side of the job, written in plain English with the sources linked.
The key dates, the EICR, EIC and Minor Works form changes, the new FI rule, and what to do before 15 October 2026.
What each code means, typical examples from Best Practice Guide 4, and how the codes decide the result under A4:2026.
Column by column: circuit details, ring finals, R1+R2, insulation resistance, polarity, Zs, RCDs and AFDDs.
Which work is notifiable in England and Wales, how schemes and building control work, and the 30-day rule.
Five-year inspections, copies to tenants and councils, and remedial deadlines, for the inspecting electrician.
How CIS deductions and the domestic reverse charge work, the wording HMRC expects, and a worked example.
AFDD requirements under Regulation 421.1.7: where arc fault detection devices are required or recommended, BS EN 62606, testing, recording and EICR coding.
Bathroom zones 0, 1 and 2 under Section 701 of BS 7671: dimensions, IP ratings, what goes where, the 30 mA RCD rule and when extra bonding may be omitted.
Best electrical certification software UK 2026: Certio, Tradecert, iCertifi, Certly, Elec-Mate and Electrical Certificate App compared on AI, offline use and price.
Cable sizing and volt drop for BS 7671: Ib ≤ In ≤ Iz, correction factors, reference methods, Table 4D5 ratings, 3% and 5% limits and worked shower example.
A consumer unit change needs an EIC and Part P notification. What to test first, failed IR circuits, 421.1.201 enclosures, RCD types and SPDs. Get it right.
Continuity testing explained: R1+R2 versus the wander lead method, nulling leads, expected mΩ/m values for twin and earth, the 1.2 factor and mistakes to avoid.
Digital vs paper electrical certificates: what NICEIC and NAPIT accept, BS 7671 Appendix 6 model forms, e-signatures, retention and what to look for in an app.
Earth electrode testing on TT systems: fall-of-potential and loop-tester methods, the RA × IΔn ≤ 50 V rule, the 200 Ω guidance and when TT is the right choice.
Earth fault loop impedance testing explained: Ze versus Zs, testing Ze safely at the origin, no-trip loop tests, 2-lead vs 3-lead, Ipf and breaking capacity.
Commercial EICR explained: GN3 intervals of 5, 3 or 1 years, the Electricity at Work Regulations duty, sampling, limitations and the defects found most often.
EICR for HMOs in England: the 5-year rule, 7-day council requests, licence conditions, scoping multiple boards and the defects found most in shared houses.
EICR rules for landlords in Scotland and Wales: five-year intervals, PAT in Scotland, Renting Homes (Wales) Act deadlines, compared to England. Know the rules.
EICR limitations explained: agreed vs operational limitations, GN3 sampling, what can never be limited, LIM and N/V entries, and wording you can adapt today.
EICR vs EIC explained: an EICR reports on an existing installation, an EIC certifies new work, Minor Works covers small changes. See which one your job needs.
How long to keep EICRs, EICs and PAT records, what personal data a certificate holds, UK GDPR lawful basis, ICO registration and secure storage. Stay compliant.
What to look for in electrical certification software: NICEIC/NAPIT acceptance, BS 7671 forms, offline use, data export, QS sign-off, GDPR and AI caveats explained.
What an Electrical Installation Certificate is, its three signatures, the single-signature form, the schedules that must be attached and who keeps copies.
Quoting vs estimating, what an electrician invoice must show, VAT and CIS notes, deposits, payment terms and statutory late payment interest. Get paid on time.
Emergency lighting certificate explained: BS 5266-1 completion and periodic certificates, monthly and annual 3-hour tests, the logbook, and what an EICR covers.
EV charger installation certificate explained: Section 722 RCD and PME rules, what goes on the EIC, Part P and DNO notification. Get the paperwork right.
BS 5839-6 grades and categories explained: Grade A to F2, LD1 to LD3, what rented, new-build and HMO homes need, and the certificates to issue with the EIC.
How long does an EICR take? Typical times for flats, houses and commercial units, what slows an inspection down, what the inspector does and how to quote it.
How often is an EICR required? Every 5 years for rented homes, 10 years for owner-occupied, 3 for industrial, yearly for pools. Full table and the legal rules.
How to become NICEIC registered: Domestic Installer vs Approved Contractor, qualifications expected and what the assessor checks. Get assessment-ready.
How to do an EICR step by step: extent and limitations, sampling, dead and live tests, schedules, coding, summary and sign-off. A working inspector's checklist.
How to price an EICR: what drives the time, per-circuit versus per-property pricing, what to include, agent volume deals and why cheap prices lose money.
How to write EICR observations: defect, location, regulation, code and action in every item, with 12 examples rewritten from vague to defensible wording.
Insulation resistance testing explained: 250, 500 and 1000 V test voltages, the 1 MΩ minimum in Table 64, what to disconnect, L+N to E and reading low results.
Maximum Zs values from BS 7671 Tables 41.2 to 41.4 for Type B, C and D MCBs, why measured Zs is compared at 80%, typical Ze, and how to check by calculation.
When a Minor Works Certificate (MEIWC) is the right form, what must be tested and recorded, and the jobs that need an EIC instead. Avoid the common mistakes.
NICEIC vs NAPIT, with STROMA and BSI: assessment, Domestic Installer vs Approved Contractor, and what assessors check on certificates. Pick the right scheme.
PAT testing in the UK: the IET Code of Practice 5th edition, why there is no fixed legal interval, risk-based intervals, Class I and II tests, records, labels.
Polarity testing explained for BS 7671: what to check at switches, lampholders and sockets, dead and live methods, and how reversed polarity is coded.
What a Qualified Supervisor does under NICEIC and NAPIT rules, what the QS signs, how certificate review works and what assessors find. Get QS sign-off right.
RCD testing explained for BS 7671: Types AC, A, F and B, the half, one and five times IΔn tests, 300 ms and 40 ms limits, RCBOs, ramp tests and common failures.
Ring final circuit testing step by step: r1, rn and r2, the cross-connection tests, why R1+R2 equals (r1+r2)/4, spotting spurs and broken rings, and 32 A rules.
Solar PV installation certificate explained: Section 712 d.c. rules, the EIC, the BS EN 62446 array test record, MCS and G98/G99. Know which document does what.
SPD requirements under Section 443 of BS 7671: when a surge protective device is mandatory, the single-dwelling opt-out, Types 1 to 3 and how to record it.
Unsatisfactory EICR? What happens next: the 28-day rule, which remedial certificate to issue, when a re-inspection is needed, and how to document the fix.
Which certificate an electric shower needs (EIC or Minor Works), Part P notification, cable and MCB sizes, RCD and bonding rules in BS 7671, and what to test.
How to size a domestic cooker circuit: the IET diversity rule, worked examples for ovens and induction hobs, cable and breaker choice, isolation, and certification.
How to wire a supply to a garage, shed or garden office: SWA cable choice and burial, whether to export the PME earth or go TT, RCDs, bonding and certification.
How to handle smart meters, missing isolators, meter tails and cut-out problems on an EICR: what you can touch, what to code, what to report to the DNO or supplier.
A practical guide to testing three-phase installations: phase sequence, insulation resistance across six pairs, Zs and PFC per phase, neutral checks and recording it on the schedule.
Every Certio EICR guide in one index: preparing, testing, coding C1 to FI, writing up, unsatisfactory reports, landlord rules and premises types. Start here.
Every UK electrical certificate explained in one index: EIC, EICR, Minor Works, PAT, EV, solar PV, consumer units, showers, emergency lighting, fire alarm.
Index of every BS 7671 testing guide: continuity, insulation resistance, polarity, loop impedance, Zs and Ze, RCD, AFDD, ring finals, earth electrodes, MFTs.
Plain-English index of landlord electrical safety rules: EICR every 5 years in England, Scotland and Wales, copy deadlines, HMO rules, fines up to £30,000.
Certio fact sheet: the UK electrical certification app, its company details, founder, certificates, tester support, pricing and what it does not do yet.
What to inspect in lofts and cellars on an EICR: buried cables in insulation, junction boxes, damp, rodent damage, extraneous parts — and which code each gets.
What BS 7671 and Part P actually require for kitchen electrics: socket positions, RCDs, cooker circuits, bonding, notifiable work and which certificate to issue.
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