Draft Details

Designation:M424.4
Source:CSA
Review start date:Oct 8, 2021
Review end date:Dec 7, 2021
Contact email:kelly.yaremko(at)csagroup.org
Draft Scope/Description:

1.1

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

1.2

This standard considers battery electric as the base system configuration. Hydrogen fuel-cell-electric and diesel-electric systems are also considered as on-board sources of electrical energy supply and are 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. 

1.3

This standard applies to those self-propelled machines using on-board voltages in the ranges of 50 V-1.5 kV AC at any frequency and 75 V-2.1 kV DC – including any repetition rate of pulsating DC. Voltages contained within on-board devices are not considered in this standard.

1.4

This document 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/maintenance personnel and bystanders is addressed by this standard.

1.5

If a value for measurement as given in this Standard is followed by an equivalent value in other units, the first stated value is to be regarded as the specification.

1.6

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 (no mandatory) to define their application.

You may comment on any section of this document by clicking the “Submit Comment” link at the bottom of the relevant section.