30 CFR §7.305
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
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.