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Code · CFR · Title 30 — Mineral Resources · Part 7 · § 7.305

§ 7.305. Critical characteristics.

109 words·~1 min read·/us/cfr/t30/s§ 7.305·

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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.
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