What Is a Licensed Electrical Worker (LEW) and Why Solar Needs One

A Licensed Electrical Worker (LEW) is an individual licensed by Singapore's Energy Market Authority (EMA) to design, install, and certify electrical installations. Every residential solar system legally requires LEW sign-off before it can be commissioned and connected to the grid, making this one of the non-negotiable steps in any legitimate installation.

• A LEW is an individually licensed person, not just a company credential, accountable specifically for your installation's electrical safety.
• LEW sign-off is a legal requirement before any system can be switched on and connected to the grid; there is no legitimate way to skip it.
• Your installer arranges the LEW as a standard, usually bundled, part of the installation, not a separate step or cost you organise.
• Any later electrical change, a battery, an EV charger, additional panels, needs its own fresh LEW sign-off, not coverage from the original certification.

What does a LEW actually do on a solar project?

The LEW reviews the electrical design, verifies correct wiring and earthing, confirms safety protections including anti-islanding are functioning, and formally certifies the installation as safe before it is switched on. This is an independent technical check, separate from the installer's own quality control, specifically because Singapore's regulatory framework requires a qualified third party to verify electrical safety before a system is energised.

What specific checks does a LEW run before signing off?

A LEW verifies wiring gauge and connections meet code, confirms proper earthing and bonding, tests that anti-islanding protection correctly disconnects the system during a simulated grid outage, and checks that DC and AC isolation points are correctly labelled and accessible. Each of these is a genuine safety-critical item, not a formality.

Why does this requirement exist?

Solar installations involve live electrical connections to the grid, and improperly wired systems pose genuine fire and safety risks, both to the household and to utility workers who may later need to service the grid connection. Requiring independent LEW certification, rather than allowing an installer to certify its own work, is a safeguard against exactly this risk.

How does someone actually become a Licensed Electrical Worker?

EMA issues the LEW license after verifying an individual's relevant electrical qualifications and hands-on experience, a formal credential distinct from general electrical trade experience or a company-level contractor license. This individual accountability, tied to a real person's license rather than only a company's, is part of why the requirement exists at the LEW level specifically, not just the installer-company level.

Is there more than one LEW grade, and does it matter for a residential solar system?

EMA's licensing framework does include different scopes of electrical work, and a residential solar installation needs a LEW whose license scope actually covers this kind of installation, not just any electrical license. Confirming this scope match, rather than assuming any LEW license is interchangeable, is a reasonable question for an installer to answer directly.

Who arranges the LEW for your installation?

Your solar installer, not you. A licensed, established installer either employs a LEW directly or has a standing arrangement with one, and LEW involvement should already be built into your quoted price. Asking an installer to confirm this explicitly, and to name who signs off your specific installation, is a reasonable and worthwhile question before signing.

Does every solar installer use the same LEW every time?

Not necessarily. Some installers employ a LEW directly as staff, while others work with an independent LEW on a per-project or ongoing arrangement, and both are legitimate as long as the specific individual is properly licensed and actually reviews your installation. What matters is confirming the arrangement and the named individual, not which employment structure the installer uses.

Can I independently verify a specific LEW's license?

Yes, and it is worth doing rather than taking an installer's word alone, in the same way checking a company's BCA ME03 license independently is worthwhile. Asking your installer to name the specific LEW handling your installation, then checking that credential directly, closes the same verification gap the solar buyer checklist already recommends for the company-level license.

Does the LEW visit my property in person?

Yes, for the commissioning and testing stage specifically, since verifying wiring, earthing, and anti-islanding protection genuinely requires hands-on inspection and testing, not a remote document review. This typically happens after physical installation is complete, as part of switching the system on for the first time.

What if the LEW finds a problem during commissioning?

The system does not get switched on until the problem is resolved, which may mean the installer returning to fix wiring, replace a component, or correct an installation error before commissioning can be completed. This is the safeguard working as intended, not a sign the process has failed, even though it delays switch-on.

Does adding a battery or EV charger later need a fresh LEW sign-off?

Yes. Any project involving a new or modified electrical connection to your home's supply, not just a full solar installation, typically needs its own appropriate sign-off, rather than relying on the original installation's certification to cover later work. See solar and EV charging for how this applies specifically to an EV charging point installed alongside or after solar.

Does LEW sign-off protect me if something goes wrong years later?

It confirms the installation met electrical safety requirements at the time of commissioning, a meaningful baseline, but it is not a substitute for the installer's own workmanship warranty covering issues that emerge later. See the solar buyer checklist for what warranty coverage to confirm separately from LEW certification.

Is LEW certification the same as SP Group's grid connection approval?

No, they are separate steps that typically happen close together. LEW certification is the technical safety sign-off on the physical installation. SP Group's grid connection approval is a separate administrative step that permits the system to formally export electricity and receive SCT or ECIS export credit.

SP Group's own process is what actually verifies LEW certification is in place, not something a homeowner needs to track independently, and both steps need to be complete before your system is fully operational.

Does the LEW requirement apply to a DIY or self-installed system?

In practice, a homeowner cannot legally self-certify a grid-connected solar installation, since LEW sign-off has to come from someone holding the license, not the property owner. This is one of several reasons a fully DIY solar installation is not a realistic path in Singapore, separate from the practical difficulty of sourcing EMA-approved equipment and safely working at height on a residential roof.

Does the LEW's certification ever expire or need renewal?

The LEW's own license is subject to EMA's renewal requirements over time, but the certification issued for a specific completed installation is a one-time sign-off tied to that installation's condition at commissioning, not something that itself expires or needs periodic renewal. A significant later modification is what triggers a fresh sign-off, not the passage of time alone.

What should I do with my LEW commissioning certificate after installation?

Keep it together with your panel and inverter warranty documents and your SP Group grid connection confirmation, since a future warranty claim, home sale, or insurance question may ask for proof the installation was properly certified. Your installer should provide this automatically, not require a specific request from you.

What is the actual next step?

See how EMA and SP Group approval actually works for the full regulatory picture, and solar certifications in Singapore for the other credential layers to verify.

Run the Sunnify solar estimate to start planning your own installation.