Confined Spaces

About this topic

Confined space entry is one of the highest-risk activities in construction. The exam tests the definition of a confined space, entry permit requirements, and why you must NEVER enter without proper controls in place.

Key facts to remember

• A confined space does not need to be fully enclosed, partial enclosure counts.
• An entry permit is mandatory before any worker enters a confined space.
• The atmosphere must be tested BEFORE entry and continuously monitored inside.
• An attendant (standby person) must remain OUTSIDE the confined space at all times.
• Rescue equipment must be in place BEFORE entry, not after.
• NEVER enter to rescue a collapsed worker without rescue equipment, most CS deaths are would-be rescuers.
• Oxygen-deficient atmosphere: below 19.5% O₂. Oxygen-enriched: above 23.5% O₂.

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