Paragraph 5 Discharge from other pressure relief devicesF1

(1)

The hydrogen gas discharge from other pressure relief devices that are not thermally-activated, including burst discs, must not be directed—

(a)

towards exposed electrical terminals, exposed electrical switches or other ignition sources;

(b)

into or towards the passenger compartment;

(c)

into or towards any vehicle wheel housing;

(d)

towards each container.

(2)

At the hydrogen-fuelled vehicle exhaust system’s point of discharge, the hydrogen concentration level must not exceed—

(a)

4.0% average by volume during any moving three-second time interval during normal operation, including start-up and shut-down;

(b)

8.0% at any time.

(3)

The test procedure that must be followed, for determining the hydrogen concentration level in sub-paragraph (2), is the compliance test for the vehicle exhaust system in paragraph 4 of Annex 5 to ECE Regulation 134.02.

Annotations

Textual amendments

F1: Sch. 5A inserted (29.4.2025) by The Road Vehicles (Construction and Use) (Amendment) Regulations 2025 (S.I. 2025/454), regs. 1(1), 2(4)