1.4 The three lawful ways in

1 The three routes

Full permit entry is the default. The other two are exceptions with entry conditions of their own, and in both cases the employer carries the burden of demonstrating that it qualifies. “Demonstrate” is the word the standard uses, and it means data, not opinion.

2 Ventilation-only entry: six conditions before you start

1910.146(c)(5)(i) lets an employer skip paragraphs (d) through (f) and (h) through (k) — that is the program, the permit and all three roles, including the attendant — but only if all of the following are true:

1. A
   The employer can demonstrate that the only hazard posed by the space is an actual or potential hazardous atmosphere.
2. B
   The employer can demonstrate that continuous forced air ventilation alone is sufficient to maintain the space safe for entry.
3. C
   The employer develops monitoring and inspection data that supports A and B.
4. D
   If an initial entry is needed to get that data, that entry is a full permit entry under (d) through (k).
5. E
   The determinations and the supporting data are documented and made available to each employee who enters, or to their authorized representative.
6. F
   The entry itself follows the specific requirements of (c)(5)(ii).

The construction version, 1926.1203(e)(1), is stricter in two places. Condition (i) requires that all physical hazards in the space are eliminated or isolated through engineering controls so that the only hazard is atmospheric — not merely that there happen to be none. And condition (ii) adds that the employer must demonstrate that if the ventilation system stops working, entrants can exit the space safely.

3 What a ventilation-only entry still requires

Skipping the permit does not mean skipping the controls. 1910.146(c)(5)(ii) — and 1926.1203(e)(2), nearly word for word — sets out eight requirements that apply to every one of these entries:

Construction adds two requirements to that list, and both are worth knowing. 1926.1203(e)(2)(vi) says the atmosphere must be continuously monitored unless the entry employer can demonstrate that continuous equipment is not commercially available or that periodic monitoring is sufficient — and where continuous monitoring is used, the equipment must have an alarm that notifies all entrants when a specified atmospheric threshold is reached, or an employee must check the monitor often enough that entrants still have adequate time to escape. And 1926.1203(e)(2)(viii) requires a safe method of entering and exiting: if a hoisting system is used, it must be designed and manufactured for personnel hoisting, with a job-made system permitted only where a registered professional engineer has approved it for personnel hoisting in writing, before use.

The certification requirement in construction sits at 1926.1203(e)(2)(ix), in the same words as (H) above.

Paragraph (H) is the one people forget exists. A ventilation-only entry is not a paperless entry: it produces a signed, dated document naming the space. It is shorter than a permit, and it is not optional.

4 Reclassification: elimination, not control

1910.146(c)(7) is the other exception, and it is the strongest claim of the three: that the space no longer has any permit space characteristic at all, so it is now a non-permit confined space. Two routes to get there:

• (c)(7)(i) — if the space poses no actual or potential atmospheric hazards and all hazards within it are eliminated without entry, it may be reclassified for as long as the non-atmospheric hazards remain eliminated.
• (c)(7)(ii) — if entry is necessary to eliminate the hazards, that entry is performed under (d) through (k) — a full permit entry. If testing and inspection during it show the hazards are gone, the space may be reclassified for as long as they stay gone.

And then the sentence that decides more arguments than any other in 1910.146, the note to (c)(7)(ii): “Control of atmospheric hazards through forced air ventilation does not constitute elimination of the hazards.”

Reclassification also has a paper requirement and an escape clause. (c)(7)(iii): the employer documents the basis for the determination through a certification containing the date, the location of the space and the signature of the person making it, available to each entrant. (c)(7)(iv): if hazards arise in a declassified space, each employee in the space shall exit, and the employer then reevaluates and determines whether it must be reclassified as a permit space again.

5 Choosing between the three, honestly

Read the “attendant outside” row next to the “rescue arrangements” row. Choosing a lesser route means choosing to have nobody watching and nobody arranged to come. That is a defensible choice when the space genuinely has one kind of hazard and the data proves the air stays good — and it is an indefensible one when the route was chosen because the permit felt like a lot of work.

6 The written program behind all three

If any employee will enter a permit space, 1910.146(c)(4) requires a written permit space program that complies with the section, available for inspection by employees and their authorized representatives. 1926.1203(d) requires the same and adds that the written program must be made available prior to and during entry operations. 1910.146(d) then lists fourteen things the program has to do, from preventing unauthorized entry through to reviewing itself.

There is a quiet parallel duty that almost never appears in training decks. 1910.146(l): employers must consult with affected employees and their authorized representatives on the development and implementation of all aspects of the permit space program, and must make available to them all information the section requires to be developed. The people who go into the space have a right to help write the rules for it — and they are the ones who know that the vault reads low after rain.