NCCER Insulator Practice Questions - NCCER Insulator Certification (4-Level Industrial Commercial) Exam

Under OSHA's silica standard (29 CFR 1926.1153), the PEL for respirable crystalline silica is:

50 µg/m³ over 8-hour TWA 500 µg/m³ over 8-hour TWA 5 mg/m³ over 8-hour TWA No established PEL

Correct Answer:

50 µg/m³ over 8-hour TWA

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