SafetyQuestion 1307 of 1605
An acceptable oxygen concentration for confined space entry is generally in what range?
a.10% to 30%
b.19.5% to 23.5%
c.Any level is fine with a respirator
d.5% to 15%
Explanation
Normal breathable air is about 20.9% oxygen. Below 19.5% is oxygen-deficient and above 23.5% is oxygen-enriched (fire risk). Entry generally requires oxygen between 19.5% and 23.5%.
Law Reference: 29 CFR 1926.1204(c)Practice all 1605 questions free — no signup required.
Related questions on this topic
- For lead work above the action level, the employer must provide hygiene facilities so workers can:
- A permit-required confined space is a confined space that has one or more of which characteristics?
- Before entering a permit-required confined space, the entry permit must document that the atmosphere has been tested. Which is typically tested FIRST?
- During a permit-required confined space entry, an attendant must:
- For permit space entry, the employer must ensure rescue and emergency services are:
- California's Heat Illness Prevention standard applies to outdoor places of employment. At what temperature must the employer's high-heat procedures take effect for industries like construction?
Last reviewed: · editorial process
Sen Lin, PrepPass Founder · Verified against California CSLB Contractor License Law & Business Exam · How we review
Reviewed by Abraham Chen — Licensed California General Contractor (CSLB License #1101856 — verify)