What Counts as a Confined Space
A confined space is large enough to bodily enter, has limited openings for getting in and out, and isn't designed for continuous occupancy. It becomes permit-required when it also has a serious hazard — a hazardous atmosphere, engulfment material, an inwardly sloping or converging shape that can trap someone, or another serious safety or health hazard.
Crane and rigging work brushes against these spaces more than people expect: hoisting equipment into a vault, lowering a pump into a wet well, setting tanks, or working near deep excavations and manholes. A rigger may never enter, but knowing the rules keeps them from becoming an accidental entrant or an improvised rescuer.
The course also touches on how confined spaces interact with other programs. Energy isolation before entry relies on lockout/tagout, and some entries require respirators or supplied air. Crews who handle the hoisting side of vault work can strengthen their load-handling skills with Rigger Level I exam prep.
How a Permit Entry Comes Together
Evaluate the space
Identify hazards and decide whether a permit is needed.
Isolate and ventilate
Lock out energy, block lines and ventilate as the plan requires.
Test the atmosphere
Check oxygen first, then flammables, then toxics — and keep monitoring.
Authorize
The entry supervisor signs the permit once conditions are acceptable.
Enter with an attendant
An attendant stays outside, keeps count and summons rescue.
Close out
Everyone exits, the permit is closed and problems are recorded.
What the Course Teaches
Recognize confined spaces and the conditions that make one permit-required
Identify atmospheric, engulfment and configuration hazards before entry
Explain the duties of the entrant, attendant and entry supervisor
Understand why untrained rescue attempts are so often fatal — and what to do instead
Standards That Apply
General industry
29 CFR 1910.146 covers permit-required confined spaces in plants and facilities.
Construction
29 CFR 1926 Subpart AA (1926.1200–1213) applies to confined spaces on construction sites, with added coordination duties for controlling contractors.
Your employer's program
Space evaluations, permits, testing equipment, rescue arrangements and hands-on practice are employer responsibilities.
This is awareness training. It does not qualify anyone to serve as an entry supervisor or rescuer without the employer's site-specific training.
Who Should Take It
- Riggers lowering equipment into vaults
- Utility and public works crews
- Plant maintenance staff
- Tank and vessel contractors
- Site supervisors
Rescue is planned, not improvised
Many confined space deaths involve would-be rescuers. The course stresses non-entry rescue (retrieval lines) and calling the planned rescue service rather than going in after someone.