The page of the certificate that records what you actually measured. Here is what belongs on it, the order Regulation 643.1 requires, and what changed when A4:2026 split it into two schedules.
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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.
The short answer
It is the page of an EIC or EICR that records the measured value for every circuit — continuity, insulation resistance, polarity, earth fault loop impedance, prospective fault current and RCD disconnection time. Regulation 644.3 requires it on a Certificate and Regulation 653.2(f) on a Condition Report, based on the model forms in Appendix 6.
BS 7671:2018+A4:2026 split the old single-page generic schedule in two: a Schedule of Circuit Details for the design and device data, and a Schedule of Test Results for the measured values.
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01 · Certificate Guide
The schedule of test results is the section of an electrical certificate that records the actual measured results for each circuit. It is where continuity, insulation resistance, polarity, earth fault loop impedance, prospective fault current and RCD disconnection time are tied back to a specific circuit reference and protective device.
It is the evidence layer of the certificate. Regulation 644.3 makes it a condition of an Electrical Installation Certificate: the Certificate shall include details of the extent of the work covered, plus Schedule(s) of Inspection and Schedule(s) of Circuit Details and Schedule(s) of Test Results. Regulation 653.2 does the same for an Electrical Installation Condition Report, listing the schedules at item (f). In both cases the schedules shall be based on the models in Appendix 6.
On an EICR, the schedule works alongside the schedule of inspections to show both what was observed visually and what was measured by test.
One schedule became two
BS 7671:2018+A4:2026 redrafted the single-page generic schedule of test results used for the EIC and EICR. There is now a separate page for the schedule of circuit details and a separate page for the schedule of test results. The Appendix 6 model forms also gained fields for recording the details of SPDs and AFDDs, and the schedule of inspections was simplified for initial verification.
A4:2026 was issued on 15 April 2026 and may be implemented immediately. BS 7671:2018+A2:2022 + Corrigendum (May 2023) + A3:2024 remains current but will be withdrawn on 15 October 2026 — so the two-page format is the one to move onto now.
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02 · Certificate Guide
The split is a clean one. Circuit details describe how the circuit was designed and protected; test results record what the instrument actually read. Between them they let a reader check every measured value against the thing it has to comply with.
Taken from the Appendix 6 model forms, the circuit-details side covers the distribution board and the circuit as designed:
“Ring final sockets”, “upstairs lights” or “EV charger radial” is a usable circuit description. “Sockets” on its own is not, because nobody re-testing the board in five years can tell which one you meant.
The test-results side records the measurements. The Appendix 6 forms use the standard symbols — R1 + R2 or R2 for protective conductor continuity, r1, rn and r2 for the three ring final circuit readings, Zs for earth fault loop impedance and Ipf for prospective fault current.
| Recorded value | Regulation | What it has to satisfy |
|---|---|---|
| Continuity — R1 + R2 or R2, and r1 / rn / r2 on ring finals | 643.2 | Continuity of protective conductors, including protective bonding conductors, and of live conductors on ring final circuits. |
| Insulation resistance, plus the test voltage used | 643.3 | The minimum values in Table 64. The model form has its own “test voltage” field — fill it in. |
| Polarity | 643.6 | Verified at the origin before energising, then throughout the installation. |
| Zs — earth fault loop impedance | 643.7.3 | The measured value shall comply with Chapter 41. A continuity test to 643.2 comes first. |
| Ipf — prospective fault current | 643.7.3.201 | Record the greater of the prospective short-circuit current or the prospective earth fault current. |
| RCD disconnection time at IΔn | 643.8 | Alternating current test at rated residual operating current — see the limits below. |
| Circuit nominal voltage | Test voltage DC | Minimum insulation resistance |
|---|---|---|
| SELV and PELV | 250 V | 0.5 MΩ |
| Up to and including 500 V, other than the above | 500 V | 1.0 MΩ |
| Above 500 V | 1000 V | 1.0 MΩ |
Regulation 643.3.3 adds a two-stage route where connected equipment is likely to influence the measurement or be damaged: test to Table 64 before the equipment is connected, then, once it is connected, apply a 250 V DC test between live conductors and the protective conductor connected to the earthing arrangement. That reading shall be at least 1 MΩ. Record which voltage you used — a bare “>299 MΩ” with no test voltage against it is not traceable.
Regulation 643.8 requires the effectiveness of automatic disconnection of supply by RCDs to be verified with suitable test equipment to BS EN 61557-6. Its NOTE gives the acceptance criteria, and they apply regardless of RCD Type, using an alternating current test at rated residual operating current (IΔn):
| RCD | Disconnection time at IΔn |
|---|---|
| General, non-delay type | 300 ms maximum |
| Delay “S” type | Between 130 ms minimum and 500 ms maximum |
No half-times and five-times columns
A4:2026 deleted Appendix 3 Table 3A, which covered the tripping times of RCDs. BS 7671 sets no ½×IΔn or 5×IΔn installation test. Those are product-standard tests for the device manufacturer. Record the disconnection time at IΔn, note the test current you applied, and do not leave a bare “trip time” with nothing to interpret it against.
03 · Certificate Guide
Regulation 643.1 does not leave the sequence to preference. The tests of Regulations 643.2 to 643.6 shall be carried out in that order, before the installation is energised. Where the installation incorporates an earth electrode, the test of Regulation 643.7.2 is also carried out before energising. If a test shows a failure to comply, that test and any preceding test whose result may have been influenced shall be repeated once the fault is rectified.
| Test | Reg | Stage |
|---|---|---|
| Continuity of conductors | 643.2 | Before energising |
| Insulation resistance | 643.3 | Before energising |
| Protection by SELV, PELV or electrical separation | 643.4 | Before energising |
| Insulation resistance / impedance of floors and walls | 643.5 | Before energising |
| Polarity | 643.6 | Before energising |
| Earth electrode resistance, where an electrode is fitted | 643.7.2 | Before energising |
| Earth fault loop impedance | 643.7.3 | Live |
| Prospective fault current | 643.7.3.201 | Live |
| Additional protection — RCD verification | 643.8 | Live |
| Check of phase sequence, on polyphase circuits | 643.9 | Live |
| Functional testing | 643.10 | Live |
| Verification of voltage drop | 643.11 | Where required by Chapter 52. Not normally required at initial verification. |
Filling the schedule in this order is not just compliance housekeeping — it is the order that stops you energising a board you have not proved dead-safe first, and it means each row is completed while the circuit is still in front of you.
04 · Certificate Guide
A good schedule is built from methodical testing, not from filling boxes afterwards. Identify the circuit clearly, take the reading, and enter it directly against the correct circuit while you are still on site.
Follow the Appendix 6 column headings and structure. They are the format scheme assessors and clients recognise, and using them stops you omitting a required field such as the insulation resistance test voltage or the rated time delay of an “S” type RCD.
The values also have to agree with one another. An R1 + R2 recorded on a lighting radial should support the Zs you measured on the same circuit. A slow RCD disconnection time should be reflected in an observation or a remedial recommendation. The schedule is not an isolated spreadsheet; it has to hold up against the rest of the certificate.
One detail that catches people out on an EIC: the maximum prospective fault current recorded should be the greater of the prospective short-circuit current or the prospective earth fault current, not whichever you happened to measure first.
If you are working on an EIC or EICR in Elec-Mate, use the digital certificate workflow so readings, observations, and exported PDFs all stay linked to the same job.
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05 · Certificate Guide
The schedule of test results is one of the easiest places for bad habits to show up. Small errors here can make an otherwise decent certificate look weak.
The easiest way to tighten this up is to capture results once, in the right place, and let the software validate and format them consistently.
06 · Certificate Guide
A digital schedule of test results reduces friction at every stage: less duplicate data entry, fewer missed circuits, cleaner exports, and more confidence when the client or scheme assessor reviews the certificate.
Regulation 644.4.202 already allows certificates to be produced in any written or electronic form, provided their authenticity and integrity can be verified by a reliable process — so a properly built digital workflow is not a compromise on compliance.
In Elec-Mate, the schedule sits inside the certificate flow, so you can move from circuit entry to observations, signatures, PDF export, and even remedial quoting without losing context. That is particularly useful on larger EICRs where speed and consistency matter.
A five-step workflow that follows the Regulation 643.1 test order.
Complete the schedule of circuit details — board reference, circuit number and description, reference method, conductor sizes, and the protective device, RCD, SPD and AFDD data — before any reading is taken.
Regulation 643.1 requires the tests of 643.2 to 643.6 in that order before energising: continuity, insulation resistance, SELV/PELV/separation, floors and walls, then polarity. Add the earth electrode test of 643.7.2 where an electrode is fitted.
Enter the DC test voltage alongside the result — 500 V against a 1.0 MΩ minimum for most low voltage circuits, or 250 V against a 1 MΩ minimum where Regulation 643.3.3 applies after connecting sensitive equipment.
Add Zs, prospective fault current and the RCD disconnection time at IΔn directly to the correct circuit row. On an EIC, record the greater of the prospective short-circuit and prospective earth fault current.
Confirm each reading is consistent with the protective device, the earthing arrangement, and any observation or remedial recommendation you have raised, then export the schedules attached to the certificate.
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