Letter of No Objection

The Land Transport Authority (LTA) welcomes applications to verify the compliance of Electric Vehicle Supply Equipment (EVSE) with the EV charging standard, know as 'Technical Reference 25 for EV Charging System (TR 25)' on the basis of the EVSE's test reports and other supporting documents. A letter of no objection (LNO) will be issued if an EVSE is verified to comply with TR 25. 

Parties who wish to supply EVSE in Singapore should apply for an LNO, using the attached application form (XLSX, 31kB), to the LTA EV Charging System Verification Panel (EVP). The applicant should be a business entity with a locally registered office or have a local authorised agent. 

The application must state the brand, model, and power rating of the EVSE, with the relevant test report(s) and Certificate of Conformity (CoC) of the EVSE attached for the EVP’s verification. Please e-mail to evcs_application@lta.gov.sg to submit your LNO applications for LNO and for any LNO-related enquiries. This email will also be used for subsequent correspondences with the EVP.

The applicant may choose to apply for an LNO under TR:25 2016 or under TR 25:2022 (but not both), and submit the relevant test reports under the respective standards shown in the Technical Compliance Checklist for LNO Application. 

Application for LNOs under TR 25:2016

Applications for LNOs based on the older TR 25:2016 will continue to be accepted for a period of two years after the publication date of TR 25:2022 on 28 Feb 2022. The exact cut-off date will be announced closer to 2024.

Application for LNOs under TR 25:2022

Charger manufacturers and dealers who wish to apply for an LNO under TR 25:2022 will need to work with Testing, Inspection, and Certification companies (TICs) to test their chargers and obtain a CoC based on TR 25:2022. Test reports should demonstrate that the charger is able to comply with the requirements in Part 1, and the relevant Parts 2/3/4 of TR 25:2022, where applicable. Test reports based on other standards alone (e.g. IEC 60335) do not equate to compliance with TR 25:2022, as they do not test for the full suite of relevant requirements and are thus not acceptable for LNO application. 

  Type of EVSE Under TR 25:2016 Under TR 25:2022
1. Fixed AC charger: AC chargers (Mode 3) which may be wall-mounted, or floor-standing.

a) TR 25:2016 & the relevant normative IEC standards referred to in the technical reference, or;

b) The following IEC standards:

  1. IEC 61851-1
  2. IEC 61851-21-2
  3. IEC 62196-1;
  4. IEC 62196-2, and;
  5. Essential tests for AC chargers under TR 25:2016 (see item 4 below)
 a) TR 25-1:2022 
2.

Portable AC charger: AC chargers with an In-cable control and protection device (IC-CPD) with rated power output between 3.6kW and 22kW (Mode 2).

 

 

a) TR 25:2016 & relevant normative IEC standards referred to in the technical reference,  which should include the following test report;

  1. IEC 62752; (only Case B1 complying with TR 25:2016 Mode 2 charging Clause 1.6.2.2 is allowed)

a) TR 25-1:2022, which should include the following test report;

  1. IEC 62752 (only Case B1 complying with TR 25:2022 Mode 2 charging Clause 5.3.2.2 is allowed)
3.

Fixed DC charger: Combined Charging System (CCS)  and CHAdeMo DC off-board charger Mode 4) with rated power output not exceeding 200kW.

Please refer to No. 7 for fixed DC charger with rated power output exceeding 150kW, using thermal management systems or automated connection device for high power charging.

a) TR 25:2016 and the relevant normative IEC standards referred to in the Technical Reference, ORor;

b) The following IEC standards:

  1. IEC 61851‐1;
  2. IEC 61851‐21‐2;
  3. IEC 61851‐23;
  4. IEC 62196‐1;
  5. IEC 62196‐3, and;
  6. Essential tests for DC chargers under TR 25:2016 (see item 5 below).
 a) TR 25-1:2022 
4.

Essential tests for AC chargers under TR 25:2016

 

The following essential tests for an AC charger are required to be carried out by an accredited test laboratory (refer to TR  25:2016 for the clauses in brackets):

a) Harmonics and DC current injection (Clause 1.7.10)
b) Interlocks (Clause 1.9.7.1)
c) Clearance and creepage distances (Clause 1.11.3)
d) Emergency switching (Clause 1.12.6)

 N.A
5. Essential tests for DC chargers under TR 25:2016

The following essential tests for a DC charger are required to be carried out by an accredited test laboratory (refer to TR 25:2016 for the clauses in brackets):

a) Emission (Clause 2.11.12.1)

 N.A
6.

Portable low-power charger (rated power output not exceeding 2.3kW)

which can be either:

• Low-power AC charger with an IC-CPD (Mode 2A), OR 

• Low-power DC off-board charger (Mode 2B)

 N.A

a) TR 25-1:2022, and

b) TR 25-2:2022, which should include the following test reports; 

  1. For Mode 2A – IEC 62752 (only Case B1), or 
  2. For Mode 2B – IEC 60335-2-29.
7. 

Fixed high-power charger (rated power output exceeding 150kW)

which can be either:

• Combined Charging System (CCS) and CHAdeMo DC off-board charger (mode 4) with an output voltage and current up to 1500VDC and 500A respectively, and uses thermal sensing with or without thermal transport and thermal exchange, or

• DC charging system with an ACD (Automated Connection Device) for conductive connection with the electric vehicle, supply voltage either up to 1000VAC or 1500VDC, and output voltage up to 1500VDC

 

 N.A

a) TR 25-1:2022, and

b) TR 25-3:2022.
8. 

Battery swapping systems intended to be used for electric motorcycles

which can be either a: 

• Battery Charge and Swap Station (BCSS) that can store and charge swappable Rechargeable Energy Storage System (RESS) and is permanently connected to the supply mains.

• Battery Store and Swap Station (BSSS) that can only store RESS.

 

 

 N.A

a) For BCSS: TR 25-1:2022, and TR 25-4:2022, or

b) For BSSS: TR 25-4:2022.

 

All test reports issued must bear the accreditation body's mark, accreditation certificate number and be traceable to the model and make of the EV charger. This has to be issued by a local or overseas laboratory accredited by SAC (Singapore Accreditation Council) or its MRA partners (Mutual Recognition Arrangement) from International Laboratory Accreditation Cooperation (ILAC). 

CoCs should be issued by a certification body accredited by SAC or its MRA partners (Multilateral Recognition Arrangement) from the International Accreditation Forum (IAF).

TICs will take some time to become accredited by national accreditation bodies (e.g. Singapore Accreditation Council for local TICs) to perform testing and certification based on TR 25:2022. LTA is currently engaging TICs to support them in obtaining the necessary accreditation. 

Below is a list of TICs accredited to test EVCS under the TR 25:2022:

Accredited TIC TR 25-1 2022 TR 25-2 2022 TR 25-3 2022 TR 25-4 2022
Intertek ✓ ✓ TBA TBA
TUV SUD  ✓ ✓ TBA ✓

 

Notes:

1. ✓ = Accredited; TBA = To be advised.
2. Parts under TR 25:2022:

  • TR 25-1:2022 EVCS - Part 1: Electrical safety & general requirements
  • TR 25-2:2022 EVCS - Part 2: Low power charging
  • TR 25-3:2022 EVCS - Part 3: High power charging 
  • TR 25-4:2022 EVCS - Part 4: Battery swapping 

3. The information in the table is accurate as of June 2022. Please refer to the associated links in the same table to check if its accredited status is valid.

Please note that LTA does not endorse or purport to endorse any of these TICs

Mandatory Accreditation Schemes for Test Reports 

All test reports must be issued by test labs which have been accredited by the Singapore Accreditation Council or its ILAC-MRA partners

Singapore Accreditation Council (SAC)

The Singapore Accreditation Council (SAC) was formed in 1996 as the national authority for the independent accreditation of Conformity Assessment Bodies (CABs). SAC operates under Enterprise Singapore, a statutory board of the Ministry of Trade and Industry. SAC's primary function is to accredit conformity assessment services such as testing, calibration, inspection and certification. It also builds trust in Singapore products and services by strengthening Singapore’s technical infrastructure for conformity assessments and forging Mutual Recognition Agreements (MRAs) with our economic partners.

International Laboratory Accreditation Cooperation Mutual Recognition Arrangement (ILAC MRA)

The International Laboratory Accreditation Cooperation (ILAC) is the international organisation for recognised accreditation bodies.  These bodies are involved in the accreditation of CABs including calibration, testing, medical testing laboratories and inspection bodies. ILAC Mutual Recognition Arrangement (ILAC MRA) provides technical underpinning to international trade, which helps promote cross-border stakeholder confidence and acceptance of accredited laboratory data and inspection results

ILAC MRA Mark

Once a CAB becomes accredited by an accreditation body, it is granted exclusive use of the ILAC MRA mark on the certificates and reports. For ease of recognition across borders, ILAC MRA has an internationally recognised mark as well. This is to be used alongside the mark of the accreditation body. 

An example of how the ILAC MRA mark is used by accredited laboratories in SAC is shown below:

ILAC MRA Mark

More information on SAC and ILAC MRA can be found at their website.

Additional Information
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