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Module

NCSO Confined Space practice questions

Written and fact-checked by the NCSO Prep team, Alberta · · Sources

Short answer

The Confined Space module of the Alberta NCSO exam covers confined space entry permits, atmospheric testing order, standby attendants, and rescue requirements. NCSO Prep has 32 practice questions in this module, each showing the legislation behind the answer. Sample questions are free to try below, and the full module is included with any NCSO Prep plan — CA$19 per month, CA$129 per year or CA$199 once. The NCSO exam overall requires 75% to pass.

What the Confined Space module covers

On the Alberta NCSO exam, Confined Space covers confined space entry permits, atmospheric testing order, standby attendants, and rescue requirements. It is one of ten modules, and the exam draws across all of them — which is why candidates who are strong on site but narrow in coverage still fail.

Where candidates lose marks. The order of atmospheric testing and the exact duties of the standby person are commonly missed.

Try 32 Confined Space questions

These are real questions from the NCSO Prep bank, shown with their answers and the reasoning behind them. Every question in the app explains the rule it comes from, so you learn where a requirement lives rather than memorising a letter.

Sample question 1

A CONFINED SPACE is defined as a space that:

  1. Is any enclosed space without natural ventilation
  2. Is any underground space or trench
  3. Has: (1) limited/restricted means of entry or exit, (2) is not designed for continuous human occupancy, AND (3) is large enough for a worker to enter to perform work correct
  4. Is too small for a worker to stand upright in
Why

All THREE elements must be present: (1) Limited entry/exit (not easily escaped in emergency), (2) Not designed for continuous occupancy (not a room or hallway), (3) Large enough to enter and work. Tanks, silos, sewers, tunnels, large vessels are common examples.

OHS Code Part 5 - Confined Space Definition

Sample question 2

A Permit-Required Confined Space differs from a confined space because it:

  1. Must be below grade (ground level)
  2. Contains or has potential for a SERIOUS HAZARD - atmospheric, engulfment, entrapment, or other recognized serious risk correct
  3. Requires a government-issued entry permit
  4. Is smaller and more difficult to enter
Why

A PRCS has one or more of: (1) Atmospheric hazard, (2) Engulfment potential, (3) Internal geometry hazard (converging walls), (4) Any other recognized serious safety/health hazard. PRCS requires a written entry permit issued by a competent person.

OHS Code Part 5 - PRCS Definition

Sample question 3

Before entering a confined space, atmospheric testing MUST measure:

  1. Temperature, humidity, and barometric pressure
  2. Only oxygen levels - other gases are secondary
  3. Oxygen level, flammable/combustible gas, and toxic contaminants correct
  4. Carbon dioxide and H2S only
Why

Three mandatory atmospheric parameters: (1) OXYGEN - safe range 19.5%-23%, (2) FLAMMABLE GAS - must be below 10% LEL, (3) TOXIC CONTAMINANTS - must be below applicable exposure limits. ALL THREE. EVERY TIME. Before entry and monitored continuously during.

OHS Code Part 5 - Atmospheric Testing Requirements

Practise the full Confined Space module →

How to study this module

  1. Answer before you read. Cover the options and try to produce the answer from memory. Recognition feels like knowledge and collapses under exam pressure.
  2. Space your review. Come back to missed questions after a day, then three days, then a week. NCSO Prep schedules this automatically.
  3. Check the source. When you miss one, read the explanation and note which instrument the rule sits in — Act, Regulation or Code.
  4. Time yourself once you are consistent. The full exam allows up to 2 hours and requires 75%.

Questions people ask

What is on the NCSO Confined Space module?

The Confined Space module covers confined space entry permits, atmospheric testing order, standby attendants, and rescue requirements.

How many Confined Space questions does NCSO Prep have?

32 questions in the Confined Space module, each with an explanation citing the underlying legislation.

What score do I need to pass the NCSO exam?

An overall score of 75%, per ACSA’s NCSO Information Booklet (February 2025). Candidates have up to 2 hours and write online.

Is there a free NCSO Confined Space practice test?

The full Legislation module is free on NCSO Prep with no credit card. Sample questions from the Confined Space module are shown free on this page, and the complete module is included with any paid plan from CA$19 per month.

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Last updated 9 August 2026.

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Sources

Exam facts on this page are taken from the certifying body's own published material. Last verified 9 August 2026.

NCSO Prep is an independent study tool. It is not affiliated with, endorsed by, or accredited by ACSA or the CFCSA.