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Last Updated: November 2026
No. 29 CFR 1910.146 sets no annual interval, and no recurring interval of any length, for confined space training. Paragraph (g)(2) requires training before an employee is first assigned duties under the standard, before a change in assigned duties, whenever a change in permit space operations presents a hazard about which the employee has not previously been trained, and whenever the employer has reason to believe there are deviations from the entry procedures or inadequacies in an employee’s knowledge or use of them. The belief that the standard is annual comes from two other paragraphs that do carry a 12-month clock, neither of which is about training: (k)(2)(iv) requires designated rescue teams to practice rescues at least once every 12 months, and (d)(14) requires the employer to review the permit space program within 1 year after each entry. Those numbers get attached to the training in retelling.
The four triggers, verbatim
1910.146(g)(2) reads: “Training shall be provided to each affected employee:”
| Paragraph | Text | What sets it off in a real plant |
|---|---|---|
| (g)(2)(i) | “Before the employee is first assigned duties under this section” | New hire, transfer in, or an existing employee added to the entrant, attendant or entry supervisor roster. |
| (g)(2)(ii) | “Before there is a change in assigned duties” | An attendant moved to entrant, or an entrant made entry supervisor. The roles carry different duties under (h), (i) and (j), so the move is a trigger. |
| (g)(2)(iii) | “Whenever there is a change in permit space operations that presents a hazard about which an employee has not previously been trained” | A new process chemical in a vessel, a nitrogen blanket added, hot work introduced into an entry, a space reclassified, new ventilation or new atmospheric monitoring equipment. |
| (g)(2)(iv) | “Whenever the employer has reason to believe either that there are deviations from the permit space entry procedures required by paragraph (d)(3) of this section or that there are inadequacies in the employee’s knowledge or use of these procedures” | A near miss, a permit audit finding, an attendant who left post, a permit signed with blank atmospheric readings. This is the trigger most facilities under-use. |
Paragraph (g)(1) sets the standard those four triggers have to meet: training must be provided “so that all employees whose work is regulated by this section acquire the understanding, knowledge, and skills necessary for the safe performance of the duties assigned.” Paragraph (g)(3) adds that the training “shall establish employee proficiency in the duties required by this section.” Proficiency is the test, not attendance.
Why so many answers say “annually”
Five separate things feed the annual answer. Two of them are real 12-month obligations inside 1910.146, and neither is a training obligation.
1. The rescue drill at (k)(2)(iv). Employers whose own employees are the designated permit space rescue service must ensure those employees “practice making permit space rescues at least once every 12 months”. That is a 12-month obligation inside 1910.146, so the number is genuinely there. It applies to rescue practice by rescuers, not to entrant, attendant or entry supervisor training.
2. The program review at (d)(14). The employer must review the permit space program, using the canceled permits retained under (e)(6), within 1 year after each entry, and revise it as necessary. The note to that paragraph lets an employer satisfy it with a single annual review covering all entries in the preceding 12 months, and states that no review is required where no entry took place in a 12-month period. This is the real source of “the program must be reviewed annually”, and it is a review of the program against your own canceled permits, not a class.
3. State plan rules. States that run their own OSHA-approved plans may adopt stricter text than federal 1910.146. If you operate in a state plan state, the governing requirement is that state’s, and it may well set an interval the federal standard does not.
4. Employer and customer policy. Most mature confined space programs retrain annually by choice, and many owner-operators write an annual requirement into contractor prequalification. That is a contractual obligation, which is real but is not 1910.146.
5. The certification record itself. Paragraph (g)(4) requires the employer to certify that the training was accomplished, with each employee’s name, the signatures or initials of the trainers, and the dates of training. A stack of certification records with dates roughly a year apart looks exactly like a standard with an annual interval, and gets described that way.
What you actually have to produce in an inspection
1910.146(g)(4) names three data elements and one access duty: each employee’s name, the signatures or initials of the trainers, the dates of training, and availability of the certification for inspection by employees and their authorized representatives. There is no required form, no required retention period in the paragraph, and no requirement that a third party issue the certification. An internal roster signed by your own trainer satisfies it.
What will not satisfy it is a vendor completion certificate with no trainer signature, or a learning management system export that records a login rather than a date of training. Both turn up constantly in audits because they are what the purchasing process produces.
Should you retrain annually anyway?
Humulo’s position: yes, for authorized entrants, attendants and entry supervisors, and no, it is not because OSHA says so. Permit space competence is unusually perishable because the consequential parts, atmospheric interpretation and the attendant’s decision to order evacuation, are the parts an employee almost never exercises. A facility that entered twelve spaces last year gave its attendants twelve repetitions, most of them uneventful.
The one thing worth doing carefully is labelling. Record an annual refresher as program policy, and record the (g)(2) events separately against the trigger that caused them. Facilities that file everything as “annual confined space training” end up unable to show a compliance officer which record answers a (g)(2)(iii) process change, and that is a harder conversation than having no annual cycle at all.
Where VR fits, and where it does not
A VR confined space simulation is a good fit for the (g)(2)(iv) trigger in particular, because that trigger arrives unplanned and usually involves a small group rather than a scheduled class. Putting an attendant who left post back through a simulated entry where the atmosphere degrades, this week rather than at the next quarterly class, is a proportionate response to an observed inadequacy, and it generates a dated record against the trigger.
What it does not do is remove the hands-on and physical elements of your program. Donning and using a retrieval system, operating your actual monitor and calibrating it, and the rescue practice at (k)(2)(iv) all stay physical. OSHA does not approve, certify or endorse training products, so no simulation can be “OSHA certified”, and claims to the contrary are marketing.
Frequently asked questions
Is confined space training required annually?
No. 29 CFR 1910.146(g)(2) requires training before first assignment, before a change in assigned duties, when a change in permit space operations presents an untrained hazard, and when the employer has reason to believe there are deviations or knowledge inadequacies. No annual or recurring interval appears in the standard.
How often is confined space training required then?
As often as one of the four (g)(2) triggers occurs. For a stable operation with no role changes, no process changes and no observed deviations, the standard’s floor is the initial training before first assignment.
Is anything in 1910.146 required every 12 months?
Yes, two things, and neither is training. Under (k)(2)(iv), employees designated to provide permit space rescue must practice making permit space rescues at least once every 12 months using dummies, manikins or actual persons in actual or representative permit spaces. Under (d)(14), the employer must review the permit space program using the canceled entry permits within 1 year after each entry, and no review is owed for a 12-month period in which no entry occurred.
Does OSHA require an annual confined space program review?
Effectively yes, if you enter. 1910.146(d)(14) requires the review within 1 year after each entry, and its note permits a single annual review covering all entries in the preceding 12 months. It is a review of the written program against the canceled permits, and it is separate from the (g) training obligations.
Does an annual refresher class satisfy OSHA?
It satisfies nothing by itself, because the standard does not ask for it, and it can leave a gap. If a process change in March presented a new hazard, the (g)(2)(iii) obligation arose in March and a refresher in October does not retroactively cover the entries made in between.
What has to be in the training certification?
Under (g)(4): each employee’s name, the signatures or initials of the trainers, and the dates of training, available for inspection by employees and their authorized representatives.
Do state OSHA plans require annual confined space training?
Some state plans adopt text stricter than federal 1910.146. If you operate under a state plan, check that state’s standard, because it and not the federal paragraph is what applies to you.
Related answers and pages
- OSHA training requirements by 29 CFR standard
- How often must practice rescue exercises be conducted?
- How often must employers review energy control procedures?
- OSHA confined space training requirements (29 CFR 1910.146)
- VR confined space training module specs
- VR confined space training
- Enterprise VR safety training
Source: 29 CFR 1910.146, Permit-required confined spaces, paragraphs (d), (g), (h) and (k), as published by OSHA. Paragraph text verified against osha.gov on 4 November 2026.
