Every grid-connected solar installation in Singapore needs a Licensed Electrical Worker (LEW). It does not matter if the system is 5 kW on a landed house or 5 MW on an industrial warehouse — EMA requires a LEW to take charge of the electrical work, submit the installation application, and certify the system safe before it connects to the SP PowerGrid. The LEW is not optional. Operating without one is an offence under the Electricity Act.
This guide covers the three LEW grades, what each can legally do on a solar project, how to verify a LEW’s credentials, the application process for becoming a LEW, and the penalties for non-compliance.
Unlicensed Electrical Work Is a Criminal Offence
Under Section 82 of the Electricity Act, any person who carries out electrical installation work without a valid LEW licence faces a fine of up to S$10,000 and/or imprisonment of up to 12 months. Firms that provide electrical services using unlicensed workers face the same penalties. Since 2018 amendments to the Act, the liability extends to companies — not just individuals.
LEW Licence Grades and Scope
EMA licenses electrical workers in three grades. Each grade defines the maximum voltage and approved load the LEW can take charge of. For solar PV, the grade determines whether the LEW can design the system, submit plans to EMA, supervise installation, and sign the completion certificate.
| Grade | Title | Voltage Limit | Approved Load | Can Design & Submit Plans | Can Take Charge of EIL | Typical Solar Application |
|---|---|---|---|---|---|---|
| 7 | Electrician | Up to 1,000V | Up to 45 kVA independently; up to 500 kVA under supervision of Grade 8 or 9 | No | No (cannot take charge of any EIL) | Small residential systems under 45 kVA; must work under supervision for larger systems |
| 8 | Electrical Technician | Up to 1,000V (except Electric Discharge Lighting Circuits) | Up to 150 kVA for design; up to 500 kVA for operation | Yes — up to 150 kVA | Yes — up to 500 kVA | Most residential and small commercial rooftop solar (up to 500 kVA) |
| 9 | Electrical Engineer | Up to 1kV / 22kV / 66kV / 230kV / 400kV (as specified on licence) | No limit | Yes — no limit | Yes — no limit | Large C&I systems above 500 kVA; systems with HV transformer connections |
Grade 7: Electrician
A Grade 7 LEW (Electrician) can independently design, install, and certify electrical installations up to 1,000V and 45 kVA. For installations between 45 kVA and 500 kVA, a Grade 7 LEW must work under the supervision of a Grade 8 or 9 LEW. A Grade 7 cannot take charge of an Electrical Installation Licence (EIL) and cannot certify electrical plans for EMA submission.
For solar PV, a Grade 7 LEW is suitable only for very small residential systems — typically single-phase installations on landed properties with capacity well below 45 kVA. Most solar contractors employ or engage Grade 8 or 9 LEWs because the 45 kVA limit is quickly exceeded.
Grade 8: Electrical Technician
A Grade 8 LEW (Electrical Technician) is the most common grade for solar installations in Singapore. They can design and submit plans for installations up to 150 kVA and take charge of installations up to 500 kVA. This covers the large majority of residential, commercial, and small industrial rooftop solar systems.
Grade 8 LEWs cannot perform high-voltage switching independently. For solar systems that connect to the SP PowerGrid through a high-voltage transformer (uncommon for rooftop but relevant for large ground-mounted or floating solar), a Grade 9 LEW is required.
Grade 9: Electrical Engineer
A Grade 9 LEW (Electrical Engineer) must be a registered Professional Engineer in electrical engineering under the Professional Engineers Act. They can take charge of electrical installations of any size, up to the voltage limit specified on their individual licence. Grade 9 licences are issued with voltage tiers: 1 kV, 22 kV, 66 kV, 230 kV, or 400 kV.
For solar PV, Grade 9 LEWs are required for:
- Systems above 500 kVA
- Systems with high-voltage grid connections
- Projects where the client or financier requires a PE-stamped electrical design
- Large C&I portfolios where a single LEW oversees multiple systems
Most Solar Systems Need Grade 8 or Above
A typical 200 kWp residential or commercial rooftop system in Singapore operates at low voltage (400V three-phase) with an AC capacity of approximately 160–180 kVA. This sits within the Grade 8 design limit (150 kVA) and well within the Grade 8 operational limit (500 kVA). For design submissions at exactly 150 kVA, confirm with EMA whether the Grade 8 limit is inclusive — some interpretations treat 150 kVA as the ceiling, requiring Grade 9 for anything at or above that threshold.
What a LEW Does on a Solar Project
The LEW’s role spans the full project lifecycle. EMA requires the LEW to be appointed before any electrical work begins — not brought in at the end to sign off a completed installation.
Design Review
The LEW reviews the electrical design for compliance with SS 638 (Singapore’s Code of Practice for Electrical Installations, aligned with IEC 60364). This includes:
- Single-line diagram accuracy
- Protection relay settings and coordination
- Cable sizing and voltage drop calculations
- Earthing and bonding arrangements
- Inverter compliance with SP PowerGrid Grid Code
EI Application Submission
For all grid-connected solar installations, the LEW submits the Electrical Installation (EI) application to EMA. For systems below 1 MWac, this is a notification process. For systems at or above 1 MWac, the EI application is part of the Electrical Installation Licence (EIL) application through the ELISE portal. The LEW’s EMA licence number is a mandatory field.
Installation Supervision
The LEW is responsible for supervising electrical work. They do not need to be on site continuously, but they must inspect critical stages: DC string terminations, inverter AC connections, protection relay commissioning, and earthing verification. The LEW must ensure all work is carried out by or under the supervision of a licensed electrical worker of the appropriate class.
Testing and Certification
After installation, the LEW conducts or witnesses testing: insulation resistance, continuity of earthing, polarity, and functional testing of protection devices. The LEW then signs the Certificate of Compliance (COC) or completion certificate. SP Services requires this document before activating export registration.
Record Maintenance
The LEW maintains installation records including as-built drawings, test reports, and inspection logs. These records must be available for EMA inspection.
How to Verify a LEW’s Licence
Before engaging any LEW, verify their credentials through EMA’s public register.
Verification Checklist
- Licence validity: Confirm the licence is current and not suspended or expired. EMA licence cards show the issue date and expiry.
- Grade matches the project: A Grade 7 LEW cannot take charge of a 200 kVA commercial system. A Grade 8 LEW cannot design a system above 150 kVA. Match the LEW grade to your system requirements.
- Voltage class: For systems connecting through a high-voltage transformer, confirm the LEW’s licence covers the relevant voltage tier.
- Solar experience: LEW licensing does not distinguish between electrical specialisations. A LEW licensed for factory wiring may not have experience with inverter protection settings or anti-islanding requirements. Ask for references from previous solar projects.
- Professional indemnity insurance: Confirm the LEW carries insurance covering the scope of work.
Where to Check
EMA maintains a public register of licensed electrical workers. Search by name or licence number at the EMA website. The ELISE portal also provides licence verification functionality.
Becoming a LEW: Application Process
For solar contractors looking to employ in-house LEWs or individuals seeking to enter the profession, the EMA application process is consistent across all three grades.
Grade 7: Electrician
| Requirement | Details |
|---|---|
| Qualification pathway (a) | NITEC Certificate in a relevant electrical trade + 2 years experience |
| Qualification pathway (b) | No academic qualifications + 10 years relevant experience |
| Qualification pathway (c) | No academic qualifications + 5 years experience + EN032 Licensed Electrician Preparatory Course |
| Application fee | S$50 (non-refundable) |
| Licence fee | S$30 |
| Assessment | Written test (60 MCQs + 4 structured questions on drawings/designs); practical test; technical assessment interview |
Grade 8: Electrical Technician
| Requirement | Details |
|---|---|
| Qualification pathway (a) | Diploma in electrical power engineering + 2 years experience |
| Qualification pathway (b) | Diploma in electrical power engineering + 1 year experience + EN033 preparatory course |
| Qualification pathway (c) | Practising Licensed Electrician (Grade 7) + 5 years experience + EN033 preparatory course |
| Application fee | S$50 (non-refundable) |
| Licence fee | S$60 |
| Assessment | Written test (60 MCQs + 4 structured questions on drawings/designs); technical assessment interview |
Grade 9: Electrical Engineer
| Requirement | Details |
|---|---|
| Qualification | Registered Professional Engineer in electrical engineering under the Professional Engineers Act |
| Experience | At least 2 years post-graduate experience in Singapore in electrical power engineering |
| Application fee | S$50 (non-refundable) |
| Licence fee | S$80 |
| Assessment | Technical assessment interview |
Common Requirements for All Grades
All applicants must demonstrate knowledge of:
- Electricity Act 2001
- Electricity (Electrical Workers) Regulations
- Electricity (Electrical Installations) Regulations
- SS 638: Code of Practice for Electrical Installations
- SS 650: Part 1 and Part 2
All applicants must have up-to-date MediSave contributions. Self-employed persons with annual net trade income over S$6,000 must contribute. Applicants aged 65 and above need a medical fitness certificate.
Application Timeline
- Prepare documents (photo ID, academic certificates, course certificates, testimonials, PE certificate for Grade 9)
- Apply and pay online via the ELISE portal
- Attend written assessment (if applicable) and technical assessment interview
- Pay licence fee after passing
- Receive licence card within 7 working days by registered post
Licences have lifetime validity upon renewal, though holders must complete refresher courses and maintain medical certification to remain active.
Electrical Installation Licence (EIL) and the LEW
For non-domestic electrical installations with an approved load exceeding 45 kVA, an Electrical Installation Licence (EIL) is required. The consumer must appoint a LEW of the appropriate class to take charge of the installation. The LEW submits the EIL application via ELISE on behalf of the consumer.
The EIL scheme does not apply to installations used exclusively for residential purposes. Most commercial and industrial solar installations therefore require both a LEW and an EIL.
| Installation Type | EIL Required? | LEW Grade Required |
|---|---|---|
| Residential (domestic only) | No | Grade 7+ for work; no EIL needed |
| Non-domestic, up to 45 kVA | No | Grade 7+ |
| Non-domestic, 45 kVA to 150 kVA | Yes | Grade 8+ |
| Non-domestic, 150 kVA to 500 kVA | Yes | Grade 8+ (operation); Grade 9 for design above 150 kVA |
| Non-domestic, above 500 kVA | Yes | Grade 9 |
Penalties for Non-Compliance
The Electricity Act sets clear penalties for violations related to electrical worker licensing.
| Offence | Penalty |
|---|---|
| Performing electrical work without a valid LEW licence (Section 82) | Fine up to S$10,000 and/or imprisonment up to 12 months |
| Firm providing electrical services using unlicensed workers | Fine up to S$10,000 and/or imprisonment up to 12 months; additional S$250 per day for continuing offences |
| Operating an electrical installation without a licence | Fine up to S$10,000 and/or imprisonment up to 3 years |
| Contravening licensed electrical worker requirements | Fine up to S$10,000 and/or imprisonment up to 12 months |
| Supplying electricity without a licence | Fine up to S$50,000 and/or imprisonment up to 3 years |
Beyond criminal penalties, non-compliance has practical consequences:
- SP Services will reject export registration without a valid LEW sign-off
- Insurance claims may be voided for installations certified by unlicensed workers
- EMA can order shutdown of non-compliant installations
- LEWs who sign off non-compliant work face licence suspension or revocation
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Common Mistakes When Engaging LEWs
1. Assuming Any LEW Can Handle Solar
LEW licensing covers all electrical work — industrial wiring, building services, street lighting, and solar. A LEW with 20 years of factory maintenance experience may never have commissioned a grid-tied inverter. Ask specifically about solar PV experience, including anti-islanding protection, SP PowerGrid Grid Code compliance, and export metering requirements.
2. Engaging a LEW After Installation Is Complete
EMA requires the LEW to be appointed before electrical work begins. Bringing in a LEW at the end to “sign off” a completed installation often results in the LEW identifying non-compliances that require rework — adding cost and delay. Involve the LEW during the design phase.
3. Mismatching LEW Grade to System Size
A Grade 8 LEW cannot legally take charge of a 600 kVA system. A Grade 7 LEW cannot independently certify a 100 kVA system. Verify the system AC capacity (not DC panel capacity) and match it to the LEW grade before engagement.
4. Not Checking Licence Expiry
LEW licences must be valid at the time of certification. An expired licence invalidates the sign-off. Check the EMA register — not just the LEW’s card — before the certification date.
5. Confusing LEW with BCA ME03
The LEW is an individual professional licence. BCA ME03 is a contractor company accreditation. A solar contractor needs both: ME03 to bid for projects and a LEW to certify the electrical installation. One does not replace the other.
Step-by-Step: How to Comply
Confirm your system voltage and capacity
Determine the AC output capacity in kVA and the operating voltage. Most rooftop solar operates at low voltage (400V three-phase). Systems with HV transformer connections need an HV-class LEW. Use the capacity to identify the minimum LEW grade: under 45 kVA (Grade 7+), 45–500 kVA (Grade 8+), above 500 kVA (Grade 9).
Find a LEW on EMA’s register
Search the EMA public register at ema.gov.sg by name or licence number. Verify the grade, voltage class, and licence validity. Ask for references from previous solar PV projects. Confirm professional indemnity insurance coverage.
Engage the LEW before installation
Appoint the LEW before any electrical work begins. The LEW reviews the electrical design, confirms compliance with SS 638, and prepares the EI application. For systems at or above 1 MWac, the LEW coordinates with the EIL application through the ELISE portal.
LEW submits EI application to EMA
The LEW submits the Electrical Installation application via ELISE. For sub-1 MWac systems, this is a notification. For systems at or above 1 MWac, this is part of the EIL application requiring single-line diagrams, protection relay settings, equipment specifications, and a site plan. EMA typically processes complete applications within 15–30 working days.
LEW signs off on completion
After installation, the LEW conducts or witnesses testing and signs the completion certificate. This certificate is required for SP Services export registration. Without it, the system cannot legally export electricity to the grid.
Related Singapore Compliance Guides
Use solar design software built for Singapore’s regulatory environment to produce designs and proposals that meet EMA technical standards from the first draft.
- EMA Generation Licensing Singapore — ELISE portal walkthrough, EIL applications for systems above 1 MWac, and Market Participant registration
- ECIS Registration Singapore — embedded consumer export scheme eligibility, application steps, and USEP billing mechanics
- SCT Registration Singapore — Standard Contestable Tariff fixed-rate export for systems below 1 MWac
- JTC Solar Requirements Singapore — mandatory deployment conditions, tenant consent process, and SPPA models
- C&I Solar Singapore — rooftop system sizing, financial modelling, and SP Services registration for commercial buyers
- Singapore Solar Compliance Hub — full index of Singapore compliance guides
solar design software that correctly models Singapore’s irradiance, temperature derating, and SP PowerGrid interconnection requirements produces yield estimates and proposals that hold up under EMA technical review.
Frequently Asked Questions
What is a Licensed Electrical Worker (LEW) in Singapore?
A Licensed Electrical Worker is an individual licensed by EMA under the Electricity Act to take professional responsibility for electrical installations. For solar PV, the LEW submits the Electrical Installation application to EMA, supervises all electrical work, signs the Electrical Installation Licence (EIL) on completion, and ensures compliance with the Electricity (Electrical Installations) Regulations.
What are the LEW grades and which do I need for solar?
LEWs are licensed in three grades. Grade 7 (Electrician): up to 1,000V, up to 45 kVA independently or 500 kVA under supervision. Grade 8 (Electrical Technician): up to 1,000V, up to 150 kVA for design submissions and 500 kVA for operation. Grade 9 (Electrical Engineer): up to the voltage limit specified on their licence (1kV to 400kV), no capacity limit. Most residential and small commercial solar systems need Grade 8. Large C&I systems above 500 kVA need Grade 9. Verify the LEW’s grade matches your system voltage and capacity.
How do I verify a LEW’s licence?
Check the EMA public register at ema.gov.sg. Search by name or licence number. Verify: (1) the licence is current and not suspended; (2) the grade matches your system requirements; (3) the licence covers electrical installation work. EMA issues licence cards within 7 working days of approval. Always cross-check the card against the online register before engaging.
Can a solar installer work without a LEW?
No. All grid-connected solar installations in Singapore must have an appointed LEW. The LEW can be employed by the solar contractor or engaged separately. The LEW takes legal responsibility for the electrical safety of the installation. Under the Electricity Act, performing electrical work without a valid licence carries a fine of up to S$10,000 and/or imprisonment of up to 12 months.
