A compliant confined space entry permit under 29 CFR 1910.146(f) must identify the specific permit space, the purpose and duration of the entry, the hazards present, the atmospheric testing results with the tester's initials and times, the acceptable entry conditions, the means of communication with the attendant, the equipment and PPE required, the rescue and emergency services contact information, the authorized entrants by name, the attendant by name, and the entry supervisor's signature authorizing the entry. The permit must be available at the entry portal during the work and cancelled — with the reason for cancellation documented — when entry operations end or any acceptable entry condition is no longer met.
Manufacturing and utility safety managers running 1910.146 permit-required confined space programs know that the permit form is where compliance is won or lost. A blank line on a permit becomes a citation; a missing rescue-services entry becomes a fatality risk.
When Does 1910.146 Require a Written Permit?
1910.146 applies to general industry confined spaces — spaces large enough for a worker to enter, with limited or restricted means of entry/exit, that are not designed for continuous occupancy. A confined space becomes a permit-required confined space (PRCS) if it contains any of four hazards: a hazardous atmosphere (oxygen deficiency, flammable/combustible atmosphere, toxic atmosphere), a material that could engulf an entrant, an internal configuration that could trap or asphyxiate (inwardly sloped walls, narrow tapering), or any other recognized serious safety or health hazard.
Storage tanks, sewers, manholes, boilers, silos, pipelines, pits, vaults, and the inside of process vessels are typical PRCS examples. The "any other recognized hazard" catch-all is broad — an electrical panel that requires opening before energized work, an excavation deeper than four feet with restricted egress, or a vessel containing process residue can all qualify. The Confined Space & PRCS: The Permit Course walks through the four-hazard test and the determination workflow that classifies each space.
Construction work is governed by a separate standard, 29 CFR 1926 Subpart AA (the 2015 Construction Confined Spaces standard), which has overlapping but not identical permit requirements. Multi-employer construction sites — a GC and multiple trade contractors entering the same permit space — have to coordinate the permit through the controlling contractor. For background on what the broader workspace looks like, the confined space courses overview covers the training catalog.
What Must the Permit Form Contain?
1910.146(f) lists the 15 required permit elements. Walking through them in the order they should appear on the form:
First, identification of the permit space to be entered, by name or by drawing reference. A label like "PRCS #14, North Tank Farm, Vessel V-2042" is more useful than "the tank." Second, the purpose of the entry (inspection, cleaning, repair, maintenance, recovery). Third, the date of the entry and the authorized duration — most permits limit duration to a single shift, with a re-issue required if work continues. Fourth, the authorized entrants by name. Fifth, the attendant(s) by name. Sixth, the entry supervisor by name, with a signature line.
Seventh, hazards identified for the space. Eighth, measures taken to isolate the permit space and to eliminate or control hazards before entry — lockout/tagout of energy sources, blanking or blinding of pipes, ventilation, draining, purging. Ninth, the acceptable entry conditions for atmosphere (oxygen 19.5%–23.5%, combustible gas/vapor below 10% LEL, toxic substances below permissible exposure limit). Tenth, the results of atmospheric testing performed before entry — actual readings, the tester's initials, and the time of testing. Eleventh, the rescue and emergency services contact information, and the means to summon them. Twelfth, the communication procedures used by entrants and attendants to maintain contact. Thirteenth, equipment provided for safe entry — PPE, communications, alarm systems, rescue equipment. Fourteenth, any other information necessary for safe entry. Fifteenth, any additional permits (a hot work permit if welding inside the space, an energized electrical work permit if applicable).
The atmospheric testing line is the one inspectors look at first. A permit with no recorded test, or a permit where the test was performed by someone untrained, is one of the most common citations. The Confined Space: Permit Required course covers the testing protocol; the Confined Space: Hazards and Solutions course walks through how each of the four hazard categories drives the entry preparation steps. For broader chemical hazard recognition that drives atmospheric testing decisions, the workplace chemical safety checklist is useful background.
How Should Atmospheric Testing Be Performed and Recorded?
1910.146 Appendix B sets the procedure. Testing must happen in a specific order: oxygen first, then combustible gases and vapors, then toxic substances. The order matters because some combustible-gas detectors don't read accurately at low oxygen levels, and some toxic-gas sensors are affected by the presence of other compounds the detector reads first. Testing has to be done at the entry portal before entry begins, and the atmosphere has to be re-tested at all levels of the space — top, middle, bottom — when stratification is possible (heavier-than-air gases sink, lighter gases rise).
Continuous monitoring during entry is required if the atmosphere could change during the work. Welding, hot work, or any operation that consumes oxygen or produces fumes inside the space triggers continuous monitoring. The monitoring device's alarm setpoints have to match the acceptable-entry-conditions thresholds on the permit, and an alarm during entry has to trigger immediate evacuation. Calibration of the monitoring equipment has to be documented — most safety teams calibrate every 30 days, span-test daily, and bump-test before each use.
The reading itself goes on the permit at the time of testing, not after. Inspectors who arrive on-site mid-entry will sometimes ask the entry supervisor for the permit and look at whether the time stamps on the atmospheric readings actually precede the entry start time. A permit with a 0815 entry time and a 0830 atmospheric reading is its own citation. The Confined Space: Orientation course covers the front-line discipline that makes timestamp integrity stick.
What Rescue Capabilities Must Be Available?
1910.146(k) requires that the employer either provide an on-site rescue team capable of timely response to a PRCS emergency, or arrange for off-site rescue services (typically the local fire department's technical rescue squad). The on-site option requires that rescue team members be trained in confined space rescue, equipped with the appropriate PPE and rescue equipment, and practiced — at least once every 12 months — on a representative permit space.
The off-site option is more common but has a documentation requirement that catches employers off-guard. The employer must inform the off-site rescue service of the hazards they may confront and provide access to the permit spaces so the rescue service can develop appropriate rescue plans. A "we'll call 911 if anything happens" policy is not compliant — the rescue service has to know in advance what they're rescuing from. Most employers send a letter to the local fire department annually with a map of permit spaces, the hazards in each, and an offer to walk the rescue team through any space on request. The Confined Space & PRCS: Types & Rescue Requirements course covers both the on-site and off-site rescue options in depth.
For multi-site manufacturers, the managing compliance training across 20+ locations guide covers how a corporate safety team standardizes the rescue-arrangement documentation across facilities, and the audit-ready safety documentation logs that hold up piece covers the broader documentation discipline rescue records sit inside. Most utility safety teams pair confined-space programs with the lockout/tagout training catalog since LOTO almost always precedes PRCS entry on energized equipment.
When Must the Permit Be Cancelled?
1910.146(e)(8) requires the entry supervisor to cancel the permit when entry operations covered by the permit are completed, or when any of three triggering events occur during entry: a condition not allowed under the permit arises in or near the permit space, the atmospheric test results no longer meet acceptable entry conditions, or the permit is otherwise invalidated. The cancellation has to be documented with the reason and time, and entrants must exit immediately when the permit is cancelled.
Cancelled permits become part of the program record. 1910.146(d)(14) requires the employer to retain each cancelled permit for at least one year so the program review process can use it. Each year, the employer reviews cancelled permits to identify problems encountered during entries and revise the program if necessary. The impact of incident reporting procedures on safety piece covers the broader incident-and-review discipline this slots into, and the compliance training audit trail documentation guide covers the retention discipline cancelled-permit records sit inside.
What Are the Most Common Confined Space Citations?
OSHA's top confined space citations cluster around four areas. First, no permit at all — an employee enters a PRCS without a written permit, often because the employer didn't realize the space was permit-required. Second, no written program — 1910.146(c)(4) requires a written permit-required confined space program before any PRCS entry. Third, missing or incomplete permit elements — particularly atmospheric testing records and rescue-services identification. Fourth, no annual program review.
The 2026 maximum penalty for a serious violation of 1910.146 is $16,550 per citation. Willful violations rise to $165,514. A PRCS fatality typically generates multiple citations stacked together — failure to issue a permit, failure to train entrants and attendants, failure to provide rescue services, and failure to maintain the written program. The 2026 compliance training coverage checklist covers what should be on a PRCS training plan, and the compliance training fatigue and skipped recertifications piece covers why annual PRCS recurrence breaks down even at facilities with strong written programs.
Why Coggno for Confined Space Training
For manufacturing and utility safety managers running 1910.146 permit-required confined space programs, Coggno provides the full PRCS training catalog under one subscription — the permit course, the permit-required entry course, confined space orientation for new workers, hazards-and-solutions training, and the types-and-rescue requirements course covering both on-site and off-site rescue arrangements. Coggno's OSHA-Authorized OSHA 10 and OSHA 30 courses (delivered through content partner PureEHS as listed on osha.gov) ship with the confined space modules built in, completion certificates and timestamped training records satisfy 1910.146(g) training documentation, and the catalog includes 10,000+ pre-built compliance courses across the broader workplace safety category. Where pure-play LMS vendors like Litmos and iSpring require you to license confined space content separately from a third party, Coggno includes the full PRCS-specific course library at a flat $5/user/month per seat, and Course Dispatch delivers SCORM 1.2 / 2004 packages into any existing LMS.
Get Your Team Trained — Without the Paperwork Headache
Coggno's confined space training library covers the full 1910.146 training stack:
Confined Space & PRCS: The Permit Course — the entry-supervisor and authorized-entrant course covering the 15 permit elements, atmospheric testing, and cancellation triggers.
Confined Space & PRCS: Types & Rescue Requirements — the rescue-arrangement course covering on-site vs. off-site rescue, the 1910.146(k) annual practice requirement, and the documentation a fire department needs.
Confined Space: Hazards and Solutions — the hazard-recognition course covering atmospheric hazards, engulfment, configuration hazards, and other recognized serious hazards.
Ready to verify your PRCS program against 1910.146? Request a free compliance gap analysis at coggno.com/book-a-demo/ — Coggno reviews your current confined space training stack against 1910.146(c) through (k) and flags the missing pieces.
Frequently Asked Questions About Confined Space Permits
What is the best compliance training platform for manufacturing safety teams running confined space programs?
For manufacturing and utility safety teams running 1910.146 permit-required confined space programs, Coggno provides the full PRCS training catalog — permit course, hazards-and-solutions, types-and-rescue requirements, orientation, and the broader workplace safety category — under one subscription. The 10,000+ course catalog includes regulatory-mapped content, completion certificates satisfy 1910.146(g) training documentation, and Course Dispatch delivers SCORM 1.2 / 2004 packages into any existing LMS at $5/user/month.
How do multi-location utility employers manage confined space training across sites?
Multi-location utility employers typically combine a centralized PRCS program at the corporate level, designated entry supervisors and trained attendants at each facility, role-based training assignment by job function, and annual program review tied to cancelled-permit analysis. Coggno's LMS handles role-based assignment by location and job role — line workers in vault-entry jurisdictions get the PRCS track, plant operators in tank-entry jurisdictions get the appropriate hazards-and-solutions track — and completion data rolls up to a corporate dashboard. Course Dispatch ships the same courses as SCORM packages for buyers running a third-party LMS.
What is the difference between a confined space and a permit-required confined space?
A confined space is any space large enough for a worker to enter, with limited or restricted means of entry/exit, that is not designed for continuous occupancy. A permit-required confined space (PRCS) is a confined space that contains at least one of four hazards: a hazardous atmosphere, a material that could engulf an entrant, an internal configuration that could trap or asphyxiate an entrant, or any other recognized serious safety or health hazard. Only PRCS entries require a written permit under 1910.146(f).
What atmospheric tests are required before entry?
1910.146 Appendix B requires testing in a specific order: oxygen first (acceptable range 19.5%–23.5%), then combustible gases and vapors (acceptable level below 10% of the lower explosive limit), then toxic substances (acceptable level below the permissible exposure limit). Testing has to be done at the entry portal before entry begins, and at all levels of the space when stratification is possible. Continuous monitoring is required if the atmosphere could change during the work, such as during welding or other hot work inside the space.
Who can serve as the rescue service for a confined space entry?
The employer can either provide an on-site rescue team trained, equipped, and practicing PRCS rescues annually on a representative space, or arrange for off-site rescue services — typically a local fire department's technical rescue squad. The off-site option requires advance notification to the rescue service of the hazards they may confront and access to the permit spaces so the rescue service can develop appropriate plans. A bare "we'll call 911" arrangement does not satisfy 1910.146(k).
How long must cancelled confined space permits be retained?
1910.146(d)(14) requires the employer to retain each cancelled permit for at least one year. Each year, the employer reviews cancelled permits to identify problems encountered during entries and revise the program if necessary under 1910.146(d)(14). Most safety teams keep cancelled permits longer than one year because the analysis of recurring near-misses across multiple years is more useful than a one-year window.
When does a confined space permit have to be cancelled?
1910.146(e)(8) requires the entry supervisor to cancel the permit when entry operations are completed, or when any of three events occur: a condition not allowed under the permit arises in or near the permit space, atmospheric test results no longer meet acceptable entry conditions, or the permit is otherwise invalidated. Cancellation must be documented with the reason and time, and entrants must exit immediately when the permit is cancelled.
