Technical Reference 25

A nationwide electric vehicle (EV) charging standard, Technical Reference 25 (TR 25), was established in 2010 to provide technical safety requirements for the EV charging systems in Singapore. 

The latest version of the technical reference is TR 25:2022, which supersedes the TR 25:2016. Please refer to this summary for the key changes to the revised TR 25. Chargers that have received a Letter of No Objection (LNO) need not be re-certified to TR 25:2022. The EMA-LTA interim joint panel will continue to accept applications for LNOs based on TR 25:2016 for a period of two years after the TR 25:2022 is published. The exact cut-off date will be announced closer to 2024. 

To give the industry time to transit to the latest requirements in TR 25:2022, there will be a six-month transition period before compliance with the maintenance and installation requirements in the revised TR 25:2022 becomes mandatory. 

You can purchase a copy of the revised TR 25:2022 on the Singapore Standards webpage.

National Public Charging Standards

Type 2 AC and Combo-2 DC charging systems are adopted as the National Public Charging Standards (NPCS). In March 2020, the Land Transport Authority (LTA) and the Energy Market Authority (EMA) jointly announced the addition of CHAdeMO charging systems as an Optional Public Charging Standards (OPCS) for EVs. This enables providers of EV chargers to bring in a larger range of public charging options for drivers and supports the wider adoption of EVs in Singapore.

Proper Installation of EV Chargers

You should engage a Licensed Electrical Worker (LEW) and an equipment specialist to install, test, and certify the fitness of EVSE installation. Before its installation, the equipment specialist must check that the EV Supply Equipment (EVSE) is issued with a Letter of No Objection (LNO) to ensure that it complies with TR 25 or the relevant International Electrotechnical Commission (IEC) standards and the essential tests as per the Technical Compliance Checklist. 

The owner is responsible for the safe use and operation of the EVSE. Regular maintenance, electrical safety inspection and testing shall be carried out on the EVSE according to TR 25:2022. A LEW and equipment specialist must be engaged to periodically inspect and maintain the EVSE. 

EV chargers and charging cables must be installed in appropriate locations, without obstructing motorists and other users. Please refer to the non-exhaustive examples below:

• EV chargers should not block driving lanes and footpaths
• Charging cables should not dangle over or go across footpaths when in use
• When the charger is not in use, there should be sufficient floor space for the charging cables such that they do not intrude into the parking lots, driving lanes and footpaths
• Wall-mounted EV Chargers shall not enter the space above parking lots, driving lanes and footpaths
• When a vehicle is parked in an EV lot, the chargers and accompanying equipment shall not block the vehicle doors

The following table contains the list of EVSE that has been issued an LNO (as of 12 May 2022):

Additional Information

• Requirements for Installation and Maintenance of EV Charger
• Letter of No Objection
• Mandatory Accreditation Schemes for the Test Reports