What are TR25 and LEW for EV Chargers in Singapore?

EV Charging Standards and Requirements in Singapore

In Singapore, Electric Vehicle (EV) charging systems must adhere to the Technical Reference for EV Charging Systems (TR25:2016). This standard specifies the technical standards and safety precautions for designing, installing, and operating EV chargers. It is essential for EV charging operators to engage a Licensed Electrical Worker (LEW) to ensure compliance with TR25 and other relevant standards.

TR25:2016 Technical Compliance Checklist

TR25:2016 outlines mandatory safety technical requirements for EV charging systems, emphasizing the need to protect individuals and properties from electrical hazards. It must be followed in conjunction with the Code of Practice for Electrical Installation (SS 638) and relevant International Electrotechnical Commission (IEC) standards. TR25:2016 covers aspects such as installation, testing, and certification of EV chargers.

Source: LTA (n.d). Testing of EV charging system [infographic]. 
https://www.lta.gov.sg/content/ltagov/en/industry_innovations/technologies/electric_vehicles.html

Installation and Maintenance Requirement

EV Charging Operators must engage LEWs to install, test, and certify the fitness of EV Supply Equipment (EVSE) installations. Before installation, the EVSE must receive a Letter of No Objection (LNO) to ensure compliance with TR25:2016 and relevant IEC standards. Operators are responsible for the safe operation and maintenance of EVSE, including regular inspections and testing as per TR25:2016 Amendment No. 1 (May 2020), for which a LEW must be engaged.

References

LTA. (n.d.). LTA | Industry & Innovations | Technologies | Electric Vehicles | Information and Resources. Retrieved July 23, 2021, from https://www.lta.gov.sg/content/ltagov/en/industry_innovations/technologies/electric_vehicles/information-and-resources.html

EMA. (n.d.). EMA | Technical Compliance Checklist For Electric Vehicle Charging System. Retrieved July 23, 2021, from https://www.ema.gov.sg/Technical_Compliance_Checklist_For_EV_Charging_System.aspx