30 CFR § 36.2 - Definitions.

---
identifier: "/us/cfr/t30/s36.2"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "30 CFR § 36.2 - Definitions."
title_number: 30
title_name: "Mineral Resources"
section_number: "36.2"
section_name: "Definitions."
chapter_name: "MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR"
subchapter_number: "B"
subchapter_name: "TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS"
part_number: "36"
part_name: "APPROVAL REQUIREMENTS FOR PERMISSIBLE MOBILE DIESEL-POWERED TRANSPORTATION EQUIPMENT"
positive_law: false
currency: "2026-04-05"
last_updated: "2026-04-05"
format_version: "1.1.0"
generator: "[email protected]"
authority: "30 U.S.C. 957, 961."
regulatory_source: "Schedule 31, 26 FR 645, Jan. 24, 1961, unless otherwise noted."
cfr_part: "36"
---


# 36.2 Definitions.

The following definitions apply in this part.

*Applicant* An individual, partnership, company, corporation, association, or other organization, that designs, manufactures, assembles, or controls the assembly and that seeks a certificate of approval or preliminary testing of mobile diesel-powered transportation equipment as permissible.

*Certificate of approval.* A formal document issued by MSHA stating that the complete assembly has met the requirements of this part for mobile diesel-powered transportation equipment and authorizing the use and attachment of an official approval plate so indicating.

*Component.* A piece, part, or fixture of mobile diesel-powered transportation equipment that is essential to its operation as a permissible assembly.

*Diesel engine.* A compression-ignition, internal-combustion engine that utilizes diesel fuel.

*Explosion proof.* A component or subassembly that is so constructed and protected by an enclosure and/or flame arrester (s) that if a flammable mixture of gas is ignited within the enclosure it will withstand the resultant pressure without damage to the enclosure and/or flame arrester(s). Also the enclosure and/or flame arrester(s) shall prevent the discharge of flame or ignition of any flammable mixture that surrounds the enclosure.

*Flame arrester.* A device so constructed that flame or sparks from the diesel engine cannot propagate an explosion of a flammable mixture through it.

*Flammable mixture.* A mixture of gas, such as methane, natural gas, or similar hydrocarbon gas with normal air, that will propagate flame or explode violently when initiated by an incendive source.

*Fuel-air ratio.* The composition of the mixture of fuel and air in the combustion chamber of the diesel engine expressed as weight-pound of fuel per pound of air.

*MSHA.* The United States Department of Labor, Mine Safety and Health Administration.

*Mobile diesel-powered transportation equipment.* Equipment that is:

(1) Used for transporting the product being mined or excavated, or for transporting materials and supplies used in mining or excavating operations;

(2) Mounted on wheels or crawler treads (tracks); and

(3) Powered by a diesel engine as the prime mover.

*Normal operation.* When each component and the entire assembly of the mobile diesel-powered transportation equipment performs the functions for which they were designed.

*Permissible.* As applied to mobile diesel-powered transportation equipment, this means that the complete assembly conforms to the requirements of this part, and that a certificate of approval to that effect has been issued.

*Subassembly.* A group or combination of components.

[61 FR 55525, Oct. 25, 1996]