📘 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.
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.
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.
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. |
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. |
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. |
✏️ 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.
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.
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.
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.
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.
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.
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.
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.
❓ Frequently Asked Questions
Common questions about Minor Electrical Works Certificates, when to use them, and how to complete them correctly in Lux Meter Pro.
A Minor Electrical Works Certificate (MEWC) is a shortened electrical certificate used for small additions or alterations to an existing installation where a full Electrical Installation Certificate (EIC) is not required.
Key characteristics:
- Single-page document covering inspection, testing and certification
- Used when protective measures remain unchanged
- Records basic test results (insulation, RCD, Zs)
- Includes declaration and signature blocks
- Compliant with BS 7671 requirements for minor works
You can use a Minor Works Certificate for small jobs where:
- Adding a single accessory to an existing circuit (socket, light, switch)
- Replacing accessories like-for-like on existing circuits
- Adding a spur from an existing circuit
- Protective devices remain unchanged
- No new circuits are being created from the consumer unit
Use a full EIC when:
- Installing new circuits from the consumer unit
- Changing or upgrading the consumer unit
- Significant rewiring or multiple circuit alterations
- Work that materially changes protective measures
The certificate should include these key test results:
- Insulation resistance (MΩ) – L/L, L/E, L/N, N/E as applicable
- Earth fault loop impedance Zs (Ω) – measured at the point of utilisation
- RCD operating times (ms) – at IΔn and 5×IΔn if RCD protection is used
- Continuity (R1+R2) – ring circuit or radial continuity
- Polarity confirmation – tick box verification
In Lux Meter Pro, enter these values in Part 3 and the PDF generator will format them correctly.
The description should be clear and specific enough for anyone to understand what work was done:
- Good: "Additional twin socket outlet added to kitchen ring final circuit, fed from existing socket behind dishwasher"
- Good: "External PIR security light installed on front elevation, spurred from hallway lighting circuit"
- Good: "Replacement of faulty FCU and connection of new cooker hood in kitchen"
- Poor: "Socket added" (too vague)
- Poor: "Electrical work" (not descriptive)
Include the location, what was installed, and which circuit it connects to.
Departures are any deviations from the requirements of BS 7671 that have been agreed with the client or are necessary due to site conditions:
- Common examples: Non-standard cable routes, agreed limitations on bonding, existing installation defects not being rectified as part of this work
- When to record: Any time your work doesn't fully meet a specific BS 7671 requirement
- How to handle: Document the departure, explain why, and ensure the client understands and accepts it
If there are no departures, leave the field blank – Lux Meter Pro will show "Not specified" or you can enter "None".
The certificate has two signature areas in Part 4:
Tested By (Inspector):
- The person who physically carried out the inspection and testing
- Must be competent to perform electrical testing
- Signs to confirm the test results are accurate
Contractor/Supervisor:
- The Qualifying Supervisor (QS) or business owner
- Takes responsibility for the work on behalf of the company
- May be the same person as the tester on small jobs
- Signs to confirm the work meets scheme requirements
For sole traders, both signatures are often the same person.
The Enrolment Number is your registration number with your electrical scheme provider (NICEIC, NAPIT, ELECSA, etc.).
Why it's important:
- Identifies you as a registered, competent contractor
- Allows scheme providers to track your certification output
- Assessors check this matches their records during audits
- Clients and building control can verify your registration
Lux Meter Pro highlights this field in the PDF because incorrect enrolment numbers are a common audit finding. Always double-check it matches your scheme paperwork.
Insulation resistance is measured between conductors and should meet minimum values:
- Minimum acceptable: 1. 0 MΩ (but aim for much higher)
- Typical good results: >200 MΩ or meter over-range
- Test voltage: Usually 500V DC for standard circuits
Recording in Lux Meter Pro:
insulation_resistance_ll– Line to Line (for 3-phase)insulation_resistance_le– Line to Earthinsulation_resistance_ln– Line to Neutralinsulation_resistance_ne– Neutral to Earth
Enter ">200" if your meter reads over-range, or the actual value in MΩ.
RCD operating times depend on the device type and test current:
At rated residual current (IΔn):
- General type (AC, A): Maximum 300ms
- Time-delayed (S type): 130-500ms
At 5× rated current (5×IΔn):
- General type: Maximum 40ms
- Time-delayed: 50ms
Typical good results:
- 30mA RCD at IΔn: 20-30ms
- 30mA RCD at 5×IΔn: 10-20ms
Enter times in milliseconds (ms) in the rcd_op_time_i and rcd_op_time_5i fields.
Yes! Lux Meter Pro includes a dedicated MinorElectricalWorksPDFGenerator that creates professional A4 landscape certificates.
PDF features:
- Professional header with BS 7671 reference and CRN
- Three-column layout for Parts 1, 2 and 3
- Full-width Part 4 declaration and signatures
- Automatic tick boxes for inspection items
- Clean formatting suitable for scheme assessments
- Instant generation on iPhone or iPad
Simply complete the form in the app and tap "Generate PDF" to create your certificate. The app is rated 4.9/5 stars by 199 electrical professionals.
Still have questions?
Our support team is here to help with Minor Works Certificate queries.
Contact Support⭐ What Electricians Say About Minor Works Certificates
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