1.1 General

Clauses 4 to 6 outline the requirements for HPD materials, laboratory sound attenuation measurements, physical tests, reporting and packaging for manufacturers of HPDs to be used in occupational settings.

Clause 7 covers the selection, care and use of HPDs. The Standard specifies procedures for estimating the effective A-weighted noise exposure level while wearing HPDs based on laboratory sound attenuation measurements. In addition, a procedure referred to as hearing protector fit testing (HPFT) that evaluates the individual workers’ attenuation using Field Attenuation Estimation Systems (FAES) is also specified.

1.2 Inclusions

The following types of HPDs are covered in this Standard:

a) earplugs;

b) earmuffs; and

c) acoustic helmets.

The sound attenuation testing and reporting requirements set forth in this Standard apply to:

a) general (passive) hearing protection devices;

b) the passive attenuation of electronic HPDs when the electronics are turned off; and

c) amplitude-sensitive (passive level-dependent) HPDs are at low levels. 

Note: Refer to Annex A for a comprehensive description of the different types and features of specialized HPDs.

1.3 Exclusions

This Standard does not address the testing and reporting requirements related to specialized attenuation measurements and/or HPD features such as:

a)    special methods and metrics related to impulsive noise reduction of HPDs (such as the impulsive peak insertion loss (IPIL);
b)    level dependency of sound-restoration (active level-dependent) when the electronics are turned on;

c) level dependency of amplitude-sensitive (passive level-dependent) HPDs at high levels; or

d)    active attenuation component of active noise reduction (ANR) devices.

Note: Refer to Standard ASA/ANSI S12.42 for guidance on the applicable methods for specialized attenuation measurements of HPDs.

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 (non-mandatory) to define their application.

This Standard applies to new or unused wheeled or tyred, self-propelled, non-rail-bound, mobile machines for use in underground mines.

This Standard describes the technical aspects and procedures necessary for the design, performance, and testing of core design and safety requirements.

This Standard covers general requirements only. Requirements common to a variety of underground mining mobile equipment are grouped in this Standard. The remaining Standards in the series state requirements for braking and specific types of power trains. See Annex DA for additional information on how to apply the CSA M424 series of Standards.

For utility / service / support machines, this Standard only includes provisions to address the risks associated with the mobility (movement of the whole machine from one location to another). Risks for the additional functions (e.g., scaling, concrete spraying, bolting, charging drilling attachment) are not covered in this Standard.

1.1 General

This Standard describes minimum performance criteria for the service braking system, secondary braking system, and parking system for rubber-tired, self-propelled underground mining machines.

This Standard provides minimum braking system performance for rubber-tired, self-propelled underground machines, and test criteria by which machine braking system performance may be verified.

These requirements are in addition to the requirements for braking systems and performance testing specified in CSA M424.0.

Notes:

1)     Additional requirements for brake systems on machines used in coal and gassy underground mines are found in CSA M424.1.

2)     Additional requirements for dynamic and continuous retarding systems for electrically driven mobile machines are found in CSA M424.4.

1.2 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.

1 Scope

1.1 Inclusions[VA1] [VA2] 

This Standard applies to eye and face protectors used in all general occupational, educational, operations or processes and facilities involving hazards or contaminants to the eyes or face. [VA3] 

Notes:

Typical hazards include flying objects and particles, splashing liquids, [VA4] molten metal, and ultraviolet, visible, and infrared radiation, but do not include X-rays, gamma rays, high-energy particulate radiation, radioactive materials, or masers. For guidance, refer to CSA Z94.3.1- Guideline for selection, use, and care of eye and face protectors.

This Standard sets minimum performance requirements in the tests described herein.

Note:

The conformance of protectors with these requirements does not imply equality of performance, nor should it be interpreted to mean that protectors are capable of affording greater protection than is specified in this Standard.

1.2 Exclusions

The Standard does not apply to certain hazards such as bioaerosols, biohazards, X-rays, gamma rays, high-energy particulate radiation, radioactive materials, or masers and factors of design such as

a)    comfort;

b)   service life; or

c)    appearance.

Note:

Refer to CSA Z94.4-26 Selection, use, and care of respirators for protection against infectious bioaerosols (See Clause 7.3.4.3 in CSA Z94.4).

The standard also does not apply to laser protective eyewear

Note: For information on laser protective eyewear, see ANSI Z136.1, American National Standard for the Safe Use of Lasers and other standards in the ANSI Z136 series.

1.3 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 (non-mandatory) to define their application.

1.4 Units of measure

The values given in SI units are the units of record for the purposes of this Standard. The values given in parentheses are for information and comparison only.