GroundRules
30 CFR 7.305: Critical characteristics.
Where this section sits in the code
- Title 30—Mineral Resources
- CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR
- SUBCHAPTER B—TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS
- PART 7—TESTING BY APPLICANT OR THIRD PARTY
- Subpart J—Electric Motor Assemblies
The following critical characteristics shall be inspected on each motor assembly to which an approval marking is affixed:
(a) Finish, width, and planarity of surfaces that form any part of a flame-arresting path.
(b) Clearances between mating parts that form flame-arresting paths.
(c) Thickness of walls, flanges, and covers that are essential in maintaining the explosion-proof integrity of the enclosure.
(d) Spacing of fastenings.
(e) Length of thread engagement on fastenings and threaded parts that assure the explosion-proof integrity of the enclosure.
(f) Use of lockwasher or equivalent with all fastenings.
(g) Dimensions which affect compliance with the requirements for packing gland parts in § 7.304 of this part.
Collected 2026-08-27T02:25:24Z. Source file · JSON