📘 What Is a Minor Electrical Works Certificate?
A Minor Electrical Works Certificate (MEWC) is used to certify small electrical jobs on existing circuits, where the protective measures and supply characteristics remain unchanged and a full Electrical Installation Certificate is not required.
Purpose
Why the Certificate Exists
- Documents small additions or alterations to existing circuits.
- Shows that the minor work has been inspected and tested in line with BS 7671.
- Provides a simple, single-page record for clients, insurers and scheme providers.
- Reduces paperwork for low‑risk jobs while keeping professional standards.
Examples of Minor Works
Typical Use Cases
- Adding a single socket to an existing ring final circuit.
- Replacing a light fitting and switch on an existing circuit.
- Spur from an existing circuit where protective devices do not change.
- Minor alterations in domestic or commercial premises where no new circuit is created.
Limitations
When Not to Use a MEWC
- New circuits from the consumer unit (requires an EIC).
- Consumer unit changes or main protective device changes.
- Significant rewiring or multiple circuit alterations.
- Where the work materially alters the means of protection.
📄 Header Strip, BS Reference & CRN
Lux Meter Pro’s MinorElectricalWorksPDFGenerator creates a professional A4 landscape header with BS reference,
minor works notice, Contractor Reference Number (CRN) and date automatically applied.
| Element | PDF Appearance | Data Source (Report Keys) |
|---|---|---|
| Title Bar | Full‑width coloured strip with the certificate title (for example, “Minor Electrical Works Certificate”). | Localised text: mewpdf.header.title. |
| BS Reference / Compliance Note | Left‑hand block showing that the certificate is compliant with BS 7671 guidance for minor works. | Localised text: mewpdf.header.bsCompliant. |
| “Minor Works Only” Notice | Second block clearly labelled “Minor Works Only” to remind users this certificate is not suitable for full installations. | Localised text: mewpdf.header.minorWorksOnly. |
| CRN (Contractor Reference Number) | Third block showing “CRN: <value>”. Auto‑defaults if no reference is provided. | contractor_ref_number (fallback: generated “MW‑<timestamp>”). |
| Date | Right‑hand block showing the current date in dd/MM/yyyy format. |
Generated at PDF time using system date. |
🔢 Certificate Structure – Parts 1, 2 & 3
The Lux Meter Pro Minor Works PDF uses a three‑column landscape layout. Parts 1–3 run vertically in left, middle and right columns, followed by a full‑width declaration and signatures in Part 4.
| Part | Column / Area | Purpose |
|---|---|---|
| Part 1 – Client & Description | Left column | Identifies the client, location, completion date and description of the minor works, plus any departures from BS 7671 and related checkboxes. |
| Part 2 – Circuit & Device Details | Middle column | Records system type, protective measures, overcurrent and RCD device data, wiring details and key technical values such as max disconnection time and max permitted Zs. |
| Part 3 – Testing | Right column | Lists inspection tick boxes (earthing, bonding, polarity etc.), insulation resistance values, RCD times and circuit resistance measurements, plus limitations and instruments used. |
| Part 4 – Declaration & Signatures | Full‑width below columns | Contains the formal declaration text and signature blocks for the person testing and the contractor / supervisor, including enrolment or scheme registration details. |
1️⃣ Part 1 – Client, Location & Departures
Part 1 of the Minor Works Certificate captures who the work was done for, where it was carried out, when it was completed and what was done. It also records any departures from BS 7671 and whether supporting documents are attached.
| Field / Item | Report Key | What to Enter |
|---|---|---|
| Client | client_name |
Full name of the person or organisation responsible for the installation (for example, “ABC Property Ltd”). |
| Location | location_address |
Address or location of the installation where the minor works were carried out. |
| Date Completed | date_minor_works_completed |
Date the minor work was completed, usually in dd/MM/yyyy format. |
| Description of Minor Works | description_minor_works |
Clear description such as “Additional twin socket added to kitchen ring final circuit” or “Lighting point moved in lounge”. |
| Departures from BS 7671 | departures_bs7671 |
Any deviations from BS 7671 (for example, agreed limitations or specific clauses not fully met). If none, leave empty and the PDF shows “Not specified”. |
| Exceptions Appended (tick box) | exceptions_appended |
Set to “Yes” to tick the box where a separate list of exceptions is attached; “No” or blank leaves it unticked. |
| Risk Assessment Appended (tick box) | risk_assessment_appended |
Set to “Yes” to tick the box when a formal risk assessment document accompanies the certificate. |
Tip:
In Lux Meter Pro, if client, location or description fields are left empty, the certificate will still generate, but placeholders such as “Not specified” may appear.
For professional work and scheme assessments, always complete these fields properly.
2️⃣ Part 2 – Circuit & Device Details
Part 2 records how the circuit is supplied and protected, including system type, protective measures, protective devices and wiring data. These details are critical for interpreting test results correctly.
| Field / Section | Report Key(s) | What to Enter |
|---|---|---|
| System Type | system_type |
Earthing arrangement such as “TN‑S”, “TN‑C‑S” or “TT”. Defaults to “TN‑S” if left empty. |
| Protection (Shock Protection Method) | protective_measure_shock |
Method of protection against electric shock (for example, automatic disconnection of supply). Default example in code is “EEBAD”. |
| Overcurrent Device |
overcurrent_device_bsenovercurrent_device_typeovercurrent_device_rating
|
BS/EN number, device type (MCB, RCBO etc.) and rated current in amps. |
| RCD Device |
rcd_device_bsenrcd_device_typercd_device_rating
|
RCD standard (for example, 61009), type (AC, A, F etc.) and rated residual current / rating used on the circuit. |
| Wiring System |
wiring_system_typewiring_system_ref_methodcsa_livecsa_cpc
|
Wiring type (for example, “PVC/PVC”), reference method (B, C etc.) and conductor cross‑sectional areas for live and CPC (mm²). |
| Maximum Disconnection Time (s) | max_disconnection_time |
Permitted maximum disconnection time for the type of circuit, often 0.4s or 5s depending on the situation. |
| Maximum Permitted Zs (Ω) | max_z_permitted |
Maximum earth fault loop impedance for the protective device and disconnection time, usually from tables in BS 7671. |
| Comments on Existing Installation | comments_existing_installation |
Short note on the condition of the existing installation (for example, “Installation satisfactory” or any concerns observed). |
3️⃣ Part 3 – Testing & Results
Part 3 records inspection tick boxes and measured values. These show that basic safety tests have been performed and that results are acceptable.
| Item | Report Key(s) | What to Enter |
|---|---|---|
| Inspection Tick Boxes (Inspections, Earthing, Bonding, Polarity, RCD Test) |
inspections_undertakenadequacy_earthingadequacy_bondingcorrect_polaritytest_button_satisfactory
|
Set values to “Yes” (or “1”) where applicable to show a ✓ in the PDF. Leave blank or use “No” if not confirmed. |
| Insulation Resistance |
insulation_resistance_llinsulation_resistance_leinsulation_resistance_lninsulation_resistance_ne
|
Enter measured values in MΩ for L/L, L/E, L/N and N/E where tested. Use “>200” where meters read over range, as appropriate to your test equipment. |
| RCD Operating Times |
rcd_op_time_ircd_op_time_5i
|
Operating times at IΔn and 5×IΔn in milliseconds (ms). If not applicable, leave blank and they will be omitted from the PDF. |
| Circuit Resistance |
circuit_res_r1r2circuit_res_r2max_zs
|
Record (R1+R2), R2 (if used) and measured Zs at the point of utilisation or protective device, in ohms (Ω). |
| Limitations | agreed_limitations |
Any agreed limitations on testing or inspection, for example inaccessible circuits or time constraints. “None” if full verification was possible. |
| Instruments Used | instrument_serials |
Instrument description and serial number(s), sufficient to identify the test equipment used. |
Note:
The PDF generator only shows some lines (for example RCD times and R1+R2) if values are present in the report data.
This keeps the certificate tidy and focussed on the tests you actually performed.
4️⃣ Part 4 – Declaration & Signatures
The final section provides the legal declaration and signature blocks for the person who carried out the work and the contractor / supervisor.
| Field / Area | Report Key | What to Enter |
|---|---|---|
| Declaration Paragraph | Localised text: mewpdf.declaration.body |
Lux Meter Pro prints the standard declaration text; no input needed other than ensuring the rest of the certificate is correct. |
| Tested By – Name | inspector_name |
Name of the person who carried out the inspection, testing and certification. |
| Tested By – Position | inspector_position |
Role or job title (for example, “Qualified Electrician”, “Approved Contractor”). |
| Tested By – Date | inspector_date |
Date the certificate was signed or testing was completed. |
| Contractor – Company | contractor_trading_title |
Trading name of the electrical contractor or business issuing the certificate. |
| Contractor – Name | supervisor_name |
Name of the person signing on behalf of the contractor (for example, QS or business owner). |
| Contractor – Position | supervisor_position |
Position of the person signing (for example, “Qualifying Supervisor”). |
| Contractor – Date | supervisor_date |
Date the contractor or QS signed the certificate. |
| Contractor – Address & Postcode | contractor_address_postcode |
Business address and postcode. This must match your scheme provider records for assessments. |
| Enrolment Number (Highlighted) | enrolment_number |
Scheme registration number (for example, NICEIC, NAPIT, ELECSA). This field is highlighted in the PDF to emphasise its importance. |
Scheme Tip:
During scheme assessments, assessors will often check that the enrolment number, company details and signatures on your minor works certificates match the records they hold.
Ensure these fields are exactly correct in Lux Meter Pro before generating PDFs.
✏️ How to Complete the Minor Works Certificate in Lux Meter Pro
The in‑app form feeds directly into MinorElectricalWorksPDFGenerator.
Follow this process to create consistent, professional Minor Electrical Works Certificates every time.
Step 1
Open the Minor Works Certificate Form
- From the main dashboard, choose the Minor Electrical Works option.
- Create a new certificate or open an existing draft linked to the job.
- The app collects all data into a
CertReportwithtestDataused by the PDF generator.
Step 2
Fill in Part 1: Client & Description
- Enter Client, Location, Date Completed and a clear Description of Minor Works.
- Record any Departures from BS 7671 if applicable, otherwise leave blank.
- Tick whether Exceptions or a Risk Assessment are appended using “Yes” in the relevant fields.
Step 3
Complete Part 2: Circuit Data
- Confirm System Type (TN‑S, TN‑C‑S, TT) and Protection method.
- Enter details for Overcurrent and RCD devices as per the protective devices actually used.
- Record wiring system type, reference method and conductor sizes so that test results are meaningful.
Step 4
Enter Test Results in Part 3
- Tick the inspection boxes for inspections undertaken, earthing, bonding, polarity and RCD test where appropriate.
- Measure and enter insulation resistance values and, where applicable, RCD operating times.
- Record (R1+R2), R2 and Zs values, ensuring they comply with permitted limits.
Step 5
Complete the Declaration (Part 4)
- Fill in the Tested By name, position and date.
- Verify Contractor details, including company name, address, supervisor name, position and date.
- Enter the correct Enrolment Number for your electrical scheme.
Step 6
Generate & Check the PDF
- Use the in‑app “Generate PDF” action to run
MinorElectricalWorksPDFGenerator.generatePDF(from:). - Review the resulting A4 landscape PDF – confirm headings, fields and tick boxes are correctly populated.
- Save the PDF to your job folder, send to the client or upload to your scheme portal as required.
✅ Minor Works Certificate Checklist
Before issuing your Minor Electrical Works Certificate from Lux Meter Pro, run through this quick checklist.
Client and location are clearly identified and match invoices or job sheets.
Description of minor works is specific enough to understand what was done without reading other documents.
System type, protective devices and wiring details are completed, so test results can be interpreted correctly.
All key test results (insulation, RCD times, Zs) are entered and fall within permitted values.
Any departures or limitations are documented with supporting risk assessments where needed.
Tester and contractor details are correct, including enrolment number and dates.
PDF preview has been visually checked – layout, spelling, and client details all look professional.
Create Professional Minor Works Certificates in Minutes
Lux Meter Pro’s MinorElectricalWorksPDFGenerator gives you clean, scheme‑friendly A4 landscape Minor Electrical Works Certificates directly from your iPhone or iPad.