# LEW Licensed Electrical Work: Why Authority Matters for Singapore Facilities

Electrical systems are essential to every industrial, commercial and logistics facility. They power production equipment, warehouse operations, air-conditioning systems, fire-safety installations, pumps, lifts, lighting, security systems and IT infrastructure.

However, electrical work is not simply a matter of connecting cables and switching on equipment. Improper design, installation, testing or energisation can lead to electric shock, fire, equipment damage, operational disruption and regulatory non-compliance.

In Singapore, certain electrical work must be undertaken or supervised by an appropriately licensed electrical worker. Engaging the right Licensed Electrical Worker—commonly known as an **LEW**—helps ensure that electrical installations are handled safely, competently and in accordance with applicable requirements.

## What Is a Licensed Electrical Worker?

An LEW is an electrical professional licensed by Singapore’s Energy Market Authority to carry out specific categories of electrical work within the limits of the person’s licence.

Depending on the licence category and authorised capacity, an LEW may be involved in:

* Designing or endorsing electrical installations.
* Inspecting existing electrical systems.
* Supervising electrical installation or modification work.
* Testing electrical installations and protective devices.
* Verifying that installations are safe for operation.
* Supporting applications, submissions and communications with the relevant authorities or electricity supply parties.
* Supervising the isolation, shutdown, energisation or restoration of electrical systems.

The appointment of an LEW does not remove the responsibilities of the building owner, employer, contractor or facility operator. Instead, the LEW provides the required electrical competence and professional oversight for the authorised scope.

## Why LEW Authority Matters

### 1. Protection of People and Property

Electrical hazards may not always be visible. Loose connections, damaged insulation, incorrect cable sizing, inadequate earthing and unsuitable protection settings can remain unnoticed until a fault occurs.

An LEW assesses the installation using professional knowledge, inspection procedures and electrical test instruments. This helps identify unsafe conditions before they result in electric shock, fire or equipment failure.

### 2. Regulatory Compliance

Singapore has established requirements governing electrical installations, electrical workers and electrical safety. Depending on the type, capacity and use of an installation, an electrical installation licence and the appointment of an appropriately authorised LEW may be required.

Facility owners and operators should determine the applicable requirements before carrying out electrical modification, upgrading, shutdown or energisation work.

The exact requirements depend on factors such as:

* The installation’s approved electrical load and voltage.
* The type and use of the premises.
* Whether the work involves a new installation or a modification.
* Whether the work affects switchboards, distribution boards or incoming supplies.
* The category and authorised capacity of the appointed LEW.
* Electricity supply and authority requirements applicable to the project.

Where clarification is needed, the project team should consult an appropriately licensed LEW and the relevant authorities before work begins.

### 3. Proper Testing Before Energisation

Completing the physical installation does not automatically mean that the system is safe to energise.

Appropriate inspection and testing may include:

* Visual examination of the installation.
* Insulation-resistance testing.
* Continuity and earthing checks.
* Polarity verification.
* Phase-sequence verification.
* Functional testing of protective devices.
* Earth-fault protection checks.
* Verification of circuit identification and labelling.
* Confirmation that covers, barriers and warning notices are installed.
* Review of test results before energisation.

The precise tests depend on the system and scope of work. Results should be properly recorded and reviewed by the responsible competent persons.

### 4. Safe Electrical Shutdowns

Electrical shutdowns can affect an entire facility. Poor planning may interrupt warehouse operations, refrigeration systems, servers, fire-safety equipment, security systems, lifts and tenant activities.

An effective shutdown plan should identify:

* The equipment and circuits affected.
* Isolation points and switching sequences.
* Critical loads that require temporary power.
* Lockout and tagout arrangements.
* Roles and responsibilities.
* Communication and approval procedures.
* Testing and commissioning requirements.
* Emergency and contingency arrangements.
* The sequence for restoring the normal electricity supply.

The LEW plays an important role in electrical supervision and the authorised switching or energisation activities applicable to the installation. The overall shutdown should also be coordinated with the facility manager, safety team, specialist contractors, equipment vendors and affected occupants.

## When Might a Facility Need an LEW?

An LEW may be required or recommended for projects involving:

* New electrical installations.
* Electrical installation licensing.
* Switchboard or distribution-board replacement.
* New circuits and electrical load additions.
* ACMV or cold-room electrical connections.
* Warehouse conversion projects.
* Generator and temporary-power connections.
* Solar or other distributed-energy systems.
* Major equipment replacement.
* Electrical shutdowns and supply restoration.
* Testing, inspection and fault investigation.
* Modification of existing electrical installations.
* Change of tenancy or premises use.
* Reinstatement involving electrical disconnection or removal.
* Periodic inspection of licensed electrical installations.

The need for an LEW and the appropriate licence category should be confirmed according to the actual installation and work scope.

## LEW Support for Temporary Generator Operations

Temporary generators are often used during planned electrical shutdowns to maintain essential operations. However, generator deployment requires more than delivering the equipment to the site.

A properly coordinated temporary-power arrangement may require:

* Confirmation of the critical electrical loads.
* Review of the generator rating and expected demand.
* Temporary distribution boards and suitable protection.
* Correctly sized power cables and connectors.
* Earthing arrangements.
* Electrical interlocking or changeover controls.
* Safe cable routing and physical protection.
* Fuel and operating-hour planning.
* Load testing before the shutdown.
* Standby technical support.
* Safe transfer back to the normal supply.

Connecting a temporary generator without adequate engineering review can cause overloading, incorrect phase rotation, inadequate fault protection, back-feeding or damage to sensitive equipment.

The generator plan should therefore be reviewed and supervised by the appropriate electrical professionals, including an LEW where required.

## Electrical Work During Reinstatement Projects

Commercial and industrial reinstatement often includes the removal or alteration of lighting, socket outlets, distribution boards, equipment power supplies and electrical containment.

Before dismantling begins, the project team should confirm:

* Which circuits are live.
* Which equipment belongs to the landlord or tenant.
* The required isolation boundaries.
* Whether cables should be removed, terminated or retained.
* The landlord’s reinstatement requirements.
* Testing requirements after the work.
* Labelling and drawing updates.
* The condition required for final handover.

Electrical systems should not be disconnected, modified or energised by unauthorised personnel. Proper coordination reduces the risk of accidental outages and damage to installations that must remain operational.

## Choosing the Right LEW

When appointing an LEW, facility owners should consider more than price.

Important considerations include:

* The LEW’s licence category and authorised capacity.
* Experience with similar industrial or commercial installations.
* Understanding of the project’s operational risks.
* Ability to coordinate with contractors and facility teams.
* Availability during shutdown and restoration periods.
* Quality of documentation and test records.
* Clear definition of responsibilities and exclusions.
* Familiarity with temporary-power and generator operations where relevant.

The appointed LEW’s licence details should be verified through the appropriate official channel.

## ISS’s Role in Electrical Projects

**Intelligence Solution & Service Pte. Ltd. (ISS)** helps clients coordinate electrical, facility and engineering projects in Singapore.

Depending on the project requirements, our support may include:

* Site assessment and scope development.
* Electrical shutdown planning.
* Temporary-generator and backup-power planning.
* Coordination with appropriately licensed LEWs.
* Contractor and stakeholder coordination.
* Risk assessment and safe-work planning.
* Permit-to-work coordination.
* Project scheduling and supervision.
* Testing and commissioning coordination.
* Documentation and handover support.

Where regulated electrical work or certification is required, it will be carried out, supervised or endorsed by an appropriately authorised LEW appointed for the specific installation and scope.

## Frequently Asked Questions

### Can any electrician perform electrical work in a commercial facility?

Not necessarily. The applicable requirements depend on the installation and nature of the work. Certain electrical work must be undertaken or supervised by an appropriately licensed electrical worker.

### Is an LEW required for an electrical shutdown?

The requirement depends on the electrical installation, voltage, approved load and activities involved. For major shutdowns, switching, modification, testing and energisation should be reviewed with the responsible LEW and facility team.

### Can an LEW approve any size of electrical installation?

No. LEWs have different licence categories and authorised capacities. The selected LEW must hold the appropriate licence for the installation and scope.

### Is a temporary generator safe to connect directly to a facility?

A generator should not be connected without proper engineering assessment. Load capacity, protection, earthing, switching arrangements, cables and prevention of back-feeding must be addressed.

### Who is responsible for electrical safety?

Electrical safety is a shared responsibility. Building owners, employers, facility managers, contractors, workers and the appointed LEW must carry out their respective duties.

## Plan Electrical Work Before Operations Are Affected

Electrical work should be planned around safety, authority requirements and operational continuity—not only the installation schedule.

Early involvement of the facility team, electrical contractors and an appropriately authorised LEW can reduce delays, prevent unsafe energisation and improve the quality of testing, documentation and handover.

**Planning an electrical shutdown, temporary generator arrangement or facility electrical upgrade?**

Contact **Intelligence Solution & Service Pte. Ltd.** to discuss the project requirements.

**WhatsApp:** [+65 8853 8602](https://wa.me/6588538602)
**Website:** [intelligencesolutionservice.com](https://intelligencesolutionservice.com/)
**Address:** 60 Paya Lebar Road, #11-22 Paya Lebar Square, Singapore 409051

*Disclaimer: This article provides general information and is not a substitute for project-specific advice from an appropriately licensed electrical worker or the relevant Singapore authorities.*