A schedule of test results is the BS 7671 Appendix 6 form, one per distribution board, that records the measured values for every circuit during initial verification or periodic inspection: circuit details, protective device, continuity (r1, rn, r2, R1+R2 or R2), insulation resistance, polarity, earth fault loop impedance (Zs), RCD operating time and AFDD test. It must accompany every Electrical Installation Certificate and EICR; without it, the document is incomplete under Chapters 64 and 65.
- One schedule per distribution board, with the board's own supply details in the header.
- Every circuit gets a line, and every cell gets a value, LIM or N/A; never a blank.
- The columns follow the test sequence: dead tests first, then live tests.
- Measured Zs is compared with the maximum for the protective device on the same line.
- Transcription from the tester to the form is where most errors happen.
What is a schedule of test results in practice?
The schedule is the evidence behind the certificate. The EIC and EICR both declare that the installation has been inspected and tested; the schedule is where the numbers live. IET Guidance Note 3 treats it as an integral part of the certificate or report, and NICEIC and NAPIT assessors read it line by line. One row describes one circuit completely: what it is, what protects it, what the limits are and what was measured, so an assessor can see at a glance whether the measured Zs is below the maximum and the RCD tripped in time.
When is a schedule of test results needed?
| Document | Schedule required? |
|---|---|
| Electrical Installation Certificate | Yes, for every board covered by the work |
| EICR | Yes, for every board within the agreed extent |
| Minor Works Certificate | No; the essential tests are recorded on the certificate itself |
For an EICR the extent of testing is agreed beforehand; where sampling is agreed, GN3 expects the sample percentage to be stated and untested circuits shown as LIM.
What does the schedule of test results contain?
Header
Board designation and location, the device and circuit supplying it, Zs and prospective fault current at the board, and the serial numbers of the test instruments used.
Circuit details (one row per circuit)
| Column | What goes in it |
|---|---|
| Circuit number and description | As labelled on the board, e.g. "3, Kitchen sockets" |
| Type of wiring and reference method | Cable type code and installation method from BS 7671 Appendix 4 |
| Conductor CSA, live and cpc | In mm² |
| Overcurrent device: BS EN, type, rating, breaking capacity | e.g. BS EN 60898, B, 32 A, 6 kA |
| Maximum disconnection time | 0.4 s for most final circuits, 5 s for distribution circuits |
| Maximum permitted Zs | From BS 7671 Chapter 41 for the device |
| RCD: BS EN, type, rating, IΔn | e.g. BS EN 61009, A, 32 A, 30 mA |
Test results
| Column | Test | Units |
|---|---|---|
| r1, rn, r2 | Ring final circuit continuity, end to end | Ω |
| R1+R2 or R2 | Protective conductor continuity | Ω |
| Insulation resistance, live-live and live-earth | At 500 V DC for 230 V circuits, minimum 1 MΩ | MΩ |
| Polarity | Confirmed correct | Tick |
| Zs | Measured earth fault loop impedance at furthest point | Ω |
| RCD operating time | At 5 × IΔn for 30 mA additional protection; 40 ms limit | ms |
| RCD and AFDD test buttons | Operated, where fitted | Tick |
| Remarks | Limitations, notes, anything unusual | Text |
Continuity and insulation resistance are dead tests, done before the circuit is energised; Zs and RCD tests are live and done last.
Common mistakes with schedules of test results
- Blank cells. The most common assessor finding. Every cell needs a value, LIM or N/A.
- Zs above the maximum on the same row with no observation raised.
- R1+R2 recorded for a ring without r1, rn and r2, which are needed to prove it is a ring.
- Insulation resistance shown as a made-up number such as 300 MΩ when the instrument reads ">200".
- RCD time in the wrong column, 1 × recorded as 5 ×.
- Copying results from the previous certificate. Identical figures across years are a red flag to assessors.
- Transcription errors from the tester's display to the form, the root cause of most of the above.
Related terms
- Earth fault loop impedance (Zs)
- External earth fault loop impedance (Ze)
- Prospective fault current (PFC)
- RCD and RCBO
- AFDD
- Multifunction tester (MFT)
How Certio helps
Certio records this on the BS 7671 model forms without the typing: photograph the board to draft the circuit schedule, point the camera at a Megger MFT-X1 to capture readings, or dictate them. Starter is free for 7 days.