1 Scope

[Replace paragraph 1 with the following]

This Standard applies to new or unused wheeled or tyred, self-propelled, electrically driven, non-rail-bound mobile machines for use in non-gassy underground mines. It provides requirements for such machines and is intended to be used in conjunction with CSA M424.0, CSA M424.1, CSA M424.2, and CSA M424.3, each as applicable.

This Standard considers battery-electric as the base system configuration. Diesel-electric system is also considered as on-board sources of electrical energy supply and is addressed by this Standard with additional specific requirements. Additionally, other energy storage technologies are considered by this Standard for application as possible sources for electric propulsion.

[Replace paragraph 3 with the following]

This Standard addresses hazards relevant to the voltage range for underground mobile machines within its scope when the machinery is used as intended. It specifies appropriate technical measures for eliminating or reducing risks arising from significant hazards during commissioning, operation, and maintenance. The safety of operators, technicians, service and maintenance personnel, and bystanders is addressed in this Standard.

[Add following at the end]

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

1 Scope

1.1 Inclusions

This Standard applies to self-propelled, hydrogen powered, non-rail-bound mobile machines for use in non-gassy underground mines. It provides requirements for hydrogen-related components and systems of such machines, such as fuel cell stack system, controller system, on-board hydrogen-related components.

It is also intended to be used in conjunction with CSA M424.0, CSA M424.3, and CSA M424.4, each as applicable.

1.2 Exclusions

This Standard considers hydrogen-related components of hydrogen-powered machines, such as fuel cell hydrogen vehicles as the base system configuration. All other components of the vehicle and related infrastructure, such as battery- and mechanical-related components are excluded from this standard.  

Notes:

1)    See CSA M424.0 for general vehicle design, safety, and performance requirements.

2)    See CSA M424.3 for brake construction, stopping performance, and test requirements.

3)    See CSA M424.4 for self-propelled, electrically driven, non- rail-bound mobile machines for use in non-gassy underground mines

1.3 Standard atmospheric conditions

The equipment shall be designed to operate under typical operating conditions as defined by manufacturer.

1.4 Terminology

In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the Standard.

Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.

Notes to tables and figures are considered part of the table or figure and may be written as requirements.

Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.