UN R105 Base text (07 series) · UNECE Regulation No. 105 (ECE R105) — Uniform provisions concerning the approval of vehicles intended for the carriage of dangerous goods with regard to their specific constructional features.
UN R105 — 07 series of amendments
Changes from 06 series of amendments (supplement 2)
- What changed
- Electric power trains must not be used for EX vehicles. Before this series, this also applied to FL vehicles.
- Paragraph 5.1.1.8. now covers “De-energizing electrical circuits” instead of a “Battery master switch”, with de-energization completed within 30 seconds after activation of the control device.
- Hydrogen fuel cell vehicles must comply with UN Regulation No. 134 (at least 02 series); vehicles using liquid hydrogen must comply with new Annex 3.
- Why
- The proposal aims to align UN Regulation No. 105 with the 2025 edition of ADR.
- The proposal contains the amendments that the Working Party on the Transport of Dangerous Goods (WP.15) agreed at its November 2023 and March 2024 sessions.
- On the secretariat's suggestion, liquid hydrogen provisions from UN GTR No. 13 were added to the proposal and the UN GTR reference was removed.
Q1What changed293 changes
Electric power train exception and new fuse exemption (paras. 5.1.1.1. and 5.1.1.3.)
The electric power train and the high voltage components which are galvanically connected to it need not comply with paragraphs 5.1.1.2 to 5.1.1.7. This applies when they comply with UN Regulation No. 100, as amended at least by the 03 series of amendments. Before, the electric power train in compliance with UN Regulation No. 100 was an exception to paragraphs 5.1.1.2. to 5.1.1.9. New item (g) exempts the circuit from the starter battery to the electric steering equipment from protection by fuses or automatic circuit breakers.
De-energizing electrical circuits instead of a battery master switch (para. 5.1.1.8.)
Paragraph 5.1.1.8. is now titled “De-energizing electrical circuits” instead of “Battery master switch”. Features to enable the de-energization of the electrical circuits for all voltage levels must be placed as close to the battery as practicable. If the feature interrupts only one lead from the energy source, it must interrupt the supply lead. The features must be designed so that they can be operated when the vehicle is stationary. The de-energization must be completed within 30 seconds after activation of the control device; before, the switch had to break the circuits within 10 seconds.
Electric power trains and trailers (paras. 5.1.2.1. and 5.1.3.5. to 5.1.3.5.4.)
Electric power trains must not be used for EX vehicles. Before this series, this also applied to FL vehicles. Trailers with regenerative braking or electric power train are not allowed. Vehicles with an electric power train must be equipped with an isolation resistance monitoring system. In stationary conditions, the vehicle must give external signals in addition to the driver warning required by paragraph 6.15.1. of UN Regulation No. 100. REESS must be designed and constructed taking into account a risk evaluation according to ISO 6469-1:2019/Amd 1:2022 to establish safety for normal operational conditions.
Vehicle propulsion system, fuel tanks and engine (paras. 5.1.3. to 5.1.3.3.1.)
Paragraph 5.1.3. is now titled “Vehicle propulsion system” instead of “Prevention of fire risks”. Hybrid vehicles equipped with an internal combustion engine and electric power train must comply with the relevant provisions of 5.1.3.2. to 5.1.3.5. Hydrogen fuel tanks and cylinders must meet UN Regulation No. 134 (at least series 02) or, for liquid hydrogen containers, the annexed technical provisions. In item (f), discharge openings of pressure relief devices and/or valves of gaseous fuel tanks must now also not impinge on electrical storage systems. The use of a fuel is permitted only if components are approved and the installation meets paragraph 5.1.1. and the listed technical requirements. The list now covers compressed hydrogen (UN Regulation No. 134) and liquid hydrogen (Annex 3), besides CNG, LNG and LPG.
Hydrogen fuel cell vehicles and shut-off devices of hydrogen containers (paras. 5.1.3.7. to 5.1.3.7.3.)
Hydrogen fuel cell vehicles must comply with the electrical power train requirements of paragraph 5.1.3.5. and with UN Regulation No. 134 (at least 02 series). Vehicles using liquid hydrogen are subject to the technical requirements reproduced in Annex 3. Shut-off devices of hydrogen containers must close automatically when the vehicle is no longer in driving mode. They must also close automatically at a deceleration of 8.0 m·s-2 against the direction of travel, and in case of a lateral overturning above 23°. The shut-off devices may be re-opened by a deliberate action of the driver. A RegVault Note says that RegVault renumbers Combustion heaters as 5.1.3.8. and 5.1.3.8.1., and that this renumbering is not part of the official text.
New Annex 3 for vehicles with a liquefied hydrogen storage system (LHSS)
New Annex 3 gives technical provisions for vehicles with a liquefied hydrogen storage system (LHSS). Paragraphs 1 to 6 of the annex are reserved. The annex has LHSS design qualification requirements (para. 7.2.), LHSS fuel system integrity (para. 7.3.) and test procedures for both (paras. 7.4. and 7.5.). All liquefied hydrogen storage systems produced for on-road vehicle service must be capable of satisfying the requirements of para. 7.2. The manufacturer must specify a maximum allowable working pressure (MAWP) for the inner container. Two RegVault Notes say the official text names a table and an annex that do not exist; RegVault prints Table 14 and Annex 3.
Transitional provisions for the 07 series of amendments (paras. 10.5. and 10.6.)
Contracting Parties may grant type approvals according to any preceding series of amendments to this Regulation. They must continue to grant extensions of existing approvals to any preceding series of amendments. From the official date of entry into force of the 07 series, Contracting Parties may not refuse to grant or accept type approvals under it. Until 1 January 2027, Contracting Parties must accept AT vehicle type approvals to the preceding series, first issued before 1 January 2027. As from 1 January 2027, they are not obliged to accept AT vehicle type approvals issued to the preceding series.
Q2Why it changed
- Proposed by
- Expert from the International Organization of Motor Vehicles Manufacturers (OICA)
- Working party
- GRSG, 128th session (October 2024)
Reasons
The proposal aims to align UN Regulation No. 105 with the 2025 edition of ADR. It contains the amendments that the Working Party on the Transport of Dangerous Goods (WP.15) agreed at its November 2023 and March 2024 sessions. The table of paragraph 5.1. is amended to reflect the new structure adopted for ADR 2025. The transitional provisions are introduced to help manufacturers adapt production and apply for approval in time to comply with the new provisions of ADR 2025.
Sources (4)
“This document aims to align UN Regulation No.105 with ADR, the 2025 edition.”
“It contains the amendments agreed on by the Working Party on the Transport of Dangerous Goods (WP.15) at their November 2023 and March 2024 sessions.”
“The table of paragraph 5.1. is amended to reflect the new structure adopted for ADR 2025.”
“The proposed transitional provisions are introduced to assist the manufacturers to adapt their (future and current) production and to apply for approval to UN Regulation No. 105 in time to comply with the new provisions of ADR 2025.”
Paragraph 5.1.1.3. introduces a new exemption for the electric steering equipment, as per ADR 2025. Electric steering systems may reach high temporary currents, like the other exemptions listed in paragraph 5.1.1.3. Fuses for these systems would have to be so large that they would only have a symbolic value.
Sources (3)
“Paragraph 5.1.1.3. introduces a new exemption for the electric steering equipment, as per the ADR 2025.”
“The electric steering systems may reach such high temporary current intensities as those of the other exemptions listed in paragraph 5.1.1.3.”
“Fuses for these systems would have to be so large that they would only have a symbolic value.”
Paragraph 5.1.1.8. uses the new wording adopted at WP.15 for the so-called “battery master switch”, now “features to enable the de-energization of the electrical circuits”. The new provisions are adapted to electric vehicles. Paragraph 5.1.3. is restructured to reflect the new powertrains that manufacturers progressively introduce, such as electric, hybrid and fuel cell vehicles.
Sources (3)
“Paragraph 5.1.1.8. is amended to reflect the new wording adopted at WP.15 to address the so-called "battery master switch" now identified as "features to enable the de-energization of the electrical circuits".”
“The new provisions are adapted to EVs.”
“Paragraph 5.1.3. is re-structured and is amended to reflect the new powertrains that are progressively introduced by the manufacturers (EVs, hybrid vehicles, fuel cell vehicles, etc.).”
The expert from the Kingdom of the Netherlands said the proposed liquid hydrogen provisions under UN GTR No. 13, Amendment 1 would create administrative hurdles. He said that certifications under this UN GTR would be incompatible with type approvals under the 1958 Agreement. On the secretariat's suggestion, liquid hydrogen provisions from UN GTR No. 13 were added to the proposal and the UN GTR reference was removed.
Sources (3)
“The expert from the Kingdom of the Netherlands argued that the proposed provisions for vehicles with liquid hydrogen subjected to the technical requirements of the UN Global Technical Regulation (UN GTR) No.13”
“He clarified that certifications granted under this UN GTR would be incompatible with type approvals granted according to UN Regulations under the 1958 Agreement.”
“On the suggestion of the secretariat, provisions on liquid hydrogen, stemming from UN GTR No. 13, were added to the proposal and reference to the UN GTR removed”
Corrigendum 1 to the 07 series amends paragraph 5.1.3.7. to read “Hydrogen fuel cell vehicles”. The proposal of the expert from OICA for this corrigendum aims to correct an inconsistency in the 07 series of amendments.
Source
“The expert from OICA introduced GRSG-129-40-Rev.1 aiming to correct an inconsistency in the 07 series of amendments to UN Regulation No. 105.”
Document trail
- 2024-07ProposalECE/TRANS/WP.29/GRSG/2024/37Proposal for the 07 series of amendments by the expert from OICA
- —RevisedGRSG-128-24-Rev.3OICA text that supersedes ECE/TRANS/WP.29/GRSG/2024/37, with the liquid hydrogen provisions added
- —Working party adoptsECE/TRANS/WP.29/GRSG/107GRSG session report, para. 45
- 2024-12Sent to WP.29ECE/TRANS/WP.29/2025/19Text that GRSG sent to WP.29 and AC.1
- —ProposalGRSG-129-40Proposal of the expert from OICA for Corrigendum 1 to the 07 series
- —Working party adoptsECE/TRANS/WP.29/GRSG/108GRSG session report, para. 40 and Annex VIII
- 2025-08Sent to WP.29ECE/TRANS/WP.29/2025/107Corrigendum 1 to the 07 series that GRSG sent to WP.29 and AC.1
- 2025-03WP.29 adoptsECE/TRANS/WP.29/1184Adopted at the 195th session (session report, para. 109)
- 2025-09-26In forceC.N.523.2025.TREATIES-XI.B.16.105UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Make sure that de-energization of the electrical circuits is completed within 30 seconds after activation of the control device.
- Equip vehicles with an electric power train with an isolation resistance monitoring system and external signals in stationary conditions.
- Design REESS taking into account a risk evaluation according to ISO 6469-1:2019/Amd 1:2022 for normal operational conditions.
- Make sure that shut-off devices of hydrogen containers close automatically in cases (a) to (c) of paragraph 5.1.3.7.3.
- For AT vehicles, plan 07 series approvals: from 1 January 2027, Contracting Parties need not accept preceding-series approvals.
Component supplier
- Make charging inlets limit or interrupt current according to ISO 17409:2020 when temperature exceeds component rated values or required limits.
- Make sure that liquefied hydrogen storage systems for on-road vehicle service can satisfy paragraph 7.2. of Annex 3.
Technical service / Approval authority
- Be ready to carry out the review of REESS that paragraph 5.1.3.5.2. gives to a technical service.
- Check that de-energization is completed within 30 seconds after activation of the control device.
- Check that shut-off devices of hydrogen containers close automatically in cases (a) to (c) of paragraph 5.1.3.7.3.
- For vehicles with a liquefied hydrogen storage system, use the Annex 3 test procedures of paragraphs 7.4. and 7.5.
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ⓘ This report gives advice only. It is not legal or type-approval advice.