OSHA clarifies the NRTL listing/approval requirements for non-electrical vacuum cleaners used in combustible dust atmospheres (OSHA LOI)

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Scenario: Some equipment manufacturers believe that all equipment used in combustible dust atmospheres, including non-electrically powered vacuum cleaners, requires NRTL listing/approval.

Question: Could OSHA clarify the NRTL listing/approval requirements for non-electrical vacuum cleaners used in combustible dust atmospheres?

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