Confined Space Entry Quiz: 18 Questions with Answers

1. What makes a space a "confined space" in the first place?

Answer: It is large enough for a person to bodily enter, has limited or restricted means of entry or exit, and is not designed for continuous occupancy

All three parts matter — big enough to enter, hard to get in or out of, and not meant for someone to be in all day. A space can fail all three tests and still just be a cramped room, not a confined space.

Source: OSHA 29 CFR 1926.1202 — definitions

2. What turns a confined space into a "permit-required confined space"?

Answer: It contains, or has the potential to contain, a hazardous atmosphere, an engulfment hazard, an internal configuration that could trap or asphyxiate someone, or another recognized serious safety or health hazard

Depth and ownership are not the test — it is the presence or potential presence of one of these specific hazard categories that makes a confined space a permit space.

Source: OSHA 29 CFR 1926.1202 — definitions

3. Before any work begins, who must identify every confined space on the site and decide which ones are permit spaces?

Answer: A competent person, through evaluation of the space — including testing, as necessary

This has to happen up front, site-wide, by someone qualified to make that call — not improvised entry-by-entry by whoever is standing there.

Source: OSHA 29 CFR 1926.1203(a)

4. An employer identifies a permit space on site but does not plan to let any employee enter it. What must the employer still do?

Answer: Take effective measures to prevent unauthorized entry into that space

Identifying a hazard and then leaving it accessible is not compliance — the employer still has to actively keep people out of a space nobody is authorized to enter.

Source: OSHA 29 CFR 1926.1203(c)

5. What is the required order for testing the atmosphere inside a permit space?

Answer: Oxygen first, then combustible gases and vapors, then toxic gases and vapors

The order is fixed because a combustible-gas meter’s readings depend on having enough oxygen present to work correctly — test oxygen first, or the rest of the readings cannot be trusted.

Source: OSHA 29 CFR 1926.1204(e)(3)

6. May the designated attendant enter the permit space during entry operations?

Answer: No — the attendant must remain outside until relieved by another attendant, with a narrow exception to attempt rescue after being relieved and if trained for it

The whole point of an attendant is a trained person who stays outside and is not also exposed to the space’s hazards. Entering defeats that — except through the specific, trained rescue exception.

Source: OSHA 29 CFR 1926.1209(d)

7. Which of these requires the attendant to order immediate evacuation of the space?

Answer: A prohibited condition develops, an entrant shows behavioral effects of hazard exposure, or an outside condition could endanger the entrants

Evacuation triggers are tied to actual conditions and signs of trouble, not a clock. An attendant who notices any of these has to call it immediately, not wait for a convenient stopping point.

Source: OSHA 29 CFR 1926.1209(f)

8. What must the attendant continuously maintain during entry operations?

Answer: An accurate count of authorized entrants in the space, and communication with them to assess their status

Knowing exactly who is inside, and staying in contact with them, is the core of the job — it is how the attendant notices trouble and knows who still needs to come out.

Source: OSHA 29 CFR 1926.1209(c), (e)

9. Which rescue approach does OSHA’s construction confined-space standard emphasize whenever it is feasible?

Answer: Non-entry rescue — retrieval lines and mechanical retrieval, so the rescuer is not also exposed to the space’s hazards

A second person entering a space that just hurt the first person is how confined-space incidents turn into multiple fatalities. Retrieving someone without anyone else going in is the preferred option whenever the space and task allow it.

Source: OSHA 29 CFR 1926.1204(d) — rescue and retrieval provisions

10. Under 1926.1207, when must an employee be trained on confined-space procedures?

Answer: Before being first assigned duties under the standard, and before any change in those assigned duties

Training has to come before exposure, not after — and it repeats whenever an employee’s duties under the standard change, not on a fixed annual calendar alone.

Source: OSHA 29 CFR 1926.1207(b)(2)–(3)

11. Which of these requires retraining under 1926.1207?

Answer: A new hazard is introduced that the employee has not been trained on, or there is evidence of a deviation from entry procedures

The same event-driven logic as 1910.147’s lockout training: a new hazard the employee has not seen, or signs the procedure is not being followed correctly, both restart the training clock.

Source: OSHA 29 CFR 1926.1207(b)(4)–(5)

12. How often must employees designated for permit-space rescue practice making rescues, at minimum?

Answer: At least once every 12 months, using a dummy or manikin

The one exception: a rescue team does not have to drill if it has actually performed a real rescue, in a similar permit space, within the past 12 months.

Source: OSHA 29 CFR 1926.1211(b)(4)

13. What must at least one member of a designated rescue team hold?

Answer: Current certification in first aid and CPR

Medical training matters because the team may be treating an entrant before any outside EMS arrives — at least one rescuer on the team has to be current on first aid and CPR.

Source: OSHA 29 CFR 1926.1211(b)(3)

14. On a site with a controlling contractor and several subcontractors, what does OSHA require regarding permit spaces?

Answer: Host employers, controlling contractors and entry employers must exchange information about permit space locations, hazards and precautions, before, during and after entry

Multi-employer sites are where confined-space fatalities often happen to a second employer’s crew who never knew a space was hazardous. The information-exchange duty runs in every direction, not just downhill from the general contractor.

Source: OSHA 29 CFR 1926.1203(h)

15. A space’s use or internal configuration changes in a way that could introduce new hazards. What must happen?

Answer: A competent person must reevaluate the space and reclassify it if the new configuration calls for it

A space that was classified once is not classified forever — a change that affects the hazards (new equipment stored inside, a new access point cut, different contents) means a competent person looks at it again.

Source: OSHA 29 CFR 1926.1203(f)

16. If employees will be entering permit spaces, what must the employer have in place?

Answer: A written permit space program that complies with 1926.1204, available for inspection

The written program is what ties the whole standard together — hazard identification, entry conditions, equipment, and the roles of entrants, attendants and entry supervisors, in one documented place.

Source: OSHA 29 CFR 1926.1203(d)

17. What equipment must the employer provide for permit-space entries under 1926.1204?

Answer: Testing and monitoring equipment, ventilation equipment, communications devices, PPE, approved lighting, barriers, and the equipment needed for safe ingress, egress and rescue

This is a deliberately broad list because permit-space hazards vary so much by site — atmospheric, physical, and rescue equipment all have to be on hand before entry, not improvised afterward.

Source: OSHA 29 CFR 1926.1204(d)

18. What must happen to control a hazardous atmosphere in many permit spaces during entry?

Answer: Continuous forced-air ventilation for as long as anyone remains inside the space

A single pre-entry blast of air does not keep the atmosphere safe once people, tools, and work processes are inside generating or disturbing hazards — ventilation has to keep running for the entry’s duration.

Source: OSHA 29 CFR 1926.1204(e)