Approved during the 29th EVS session.

Minutes of the 29th EVS-GTR meeting held in Torrance, CA on 17-19 February 2025. The group reviewed transposition of GTR 20 to national regulations in China, the European Union, Japan, the United States, and Canada. The European Union reported the 05 series of amendments to UN R100 containing thermal propagation test requirements will be adopted by WP.29/AC1 in March 2025 and implemented from September 2027 for new types and September 2029 for all vehicles. The United States published a Final Rule based on GTR 20 on 20 December 2024 applying documentation requirements for thermal propagation. The group discussed risk management analysis methods, initiation methods for thermal propagation testing, and vehicle operating modes, and agreed to include five initiation methods in the draft amendments. A drafting group led by the United States and Canada will prepare draft amendments for submission to May GRSP.

Proposal to amend the table of contents, modify para. 3.42. to clarify specific voltage condition definitions, amend paras. 5.4.12. to 5.4.12.2. and 7.3.12. to 7.3.12.2. to establish thermal propagation requirements with two compliance options (test approach or risk management approach), insert new paras. 5.4.12.3. to 5.4.12.3.2.4. and 7.3.12.3. to 7.3.12.3.2.4. detailing thermal propagation compliance options, insert new paras. 6.2.12. to 6.2.12.6. and 8.2.11. to 8.2.11.6. specifying thermal propagation test procedures, and insert Annex 3 with five appendices describing thermal runaway initiation methods.

Request for authorization to develop test procedures to assess the mechanical integrity and durability of supply lines to any additional Thermally activated Pressure Relief Devices (TPRD) connected directly to the Compressed Hydrogen Storage System (CHSS).