Optimization Guide

Shopify Confined Space Entry Permit OSHA 1910.146 Schema — A Space With Inwardly Converging Walls Is Permit-Required Even With No Atmospheric Hazard; Reclassification Requires Written Certification Signed by the Entry Supervisor, Not Verbal Agreement; Authorized Entrant, Attendant, and Entry Supervisor Are Three Distinct Roles With Different Authorities; Non-Entry Retrieval Is the Default Rescue Method

Q: Can a permit-required confined space be reclassified as a non-permit space?

Yes — but only under strict conditions defined in OSHA 1910.146(c)(7), and reclassification requires written documentation signed by the entry supervisor. It cannot be accomplished by verbal agreement, longstanding practice, or employer declaration. Reclassification is permitted only when all of the hazards that make the space permit-required have been eliminated — not merely controlled. The distinction between elimination and control is critical: continuous forced-air ventilation that maintains O2 at acceptable levels controls an atmospheric hazard but does not eliminate it. If the ventilation fails, the hazard returns. Controlling a hazard does not meet the reclassification standard. Elimination means the hazard source has been permanently removed or the space has been physically altered so the hazard cannot exist. For a criterion (c) space with converging walls, the geometry cannot be changed during entry — so a criterion (c) space can never be reclassified during the entry; it remains permit-required unless the physical structure of the space is permanently modified so converging walls no longer exist. When reclassification conditions are met, OSHA 1910.146(c)(7) requires: (1) A written certification that all hazards have been eliminated — signed by the entry supervisor; (2) The certification must include the date, location of the space, and signature of the person making the determination; (3) The certification must be made available to each employee entering the space. A product listing for a 'non-permit space entry kit' should carry cs.is_osha_reclassified = 'true' to indicate it is appropriate for reclassified spaces — and the associated documentation requirement should be flagged. A product with cs.is_osha_reclassified = 'false' and cs.space_classification = 'permit_required' requires a full permit entry procedure.

Q: How does OSHA 1910.146 (general industry) differ from OSHA 1926 Subpart AA (construction)?

OSHA 1910.146 is the general industry confined spaces standard, covering most manufacturing, utilities, and facilities maintenance operations. OSHA 1926 Subpart AA (sections 1926.1201 through 1926.1213), effective August 3, 2015, is the construction industry confined spaces standard. While the construction standard is modeled on 1910.146, it includes several additional requirements not present in the general industry standard. Key differences: (1) Controlling contractor coordination — under 1926.1203, when multiple employers are involved (a general contractor plus subcontractors), the controlling contractor must coordinate confined space activities and share information about all known permit spaces with all employers. Multiple subcontractors working in the same space must share permit information. No equivalent coordination requirement exists in 1910.146 for general industry. (2) Continuous atmospheric monitoring during entry is more broadly required under 1926 Subpart AA. (3) The construction standard explicitly defines 'competent person' requirements for confined space coordination functions. (4) Multi-employer worksite provisions: the controlling contractor remains responsible for the overall confined space program even when a subcontractor performs the entry. (5) 1926.1203(h) requires reclassification procedures similar to 1910.146(c)(7) but with specific requirements for the construction context, including coordination with the controlling contractor when the controlling contractor reclassifies a space. Products certified only for '1910.146 compliance' may not satisfy 1926 Subpart AA requirements for controlling contractor coordination, multi-employer worksite management, or construction-specific documentation. Encode cs.osha_standard as '1910.146' for general industry, '1926.1201' for construction, or '1910.146|1926.1201' for products compliant with both standards.

Confined space equipment listings fail AI agent routing when permit vs non-permit classification depends only on atmospheric testing. OSHA 1910.146(b) makes a space permit-required on ANY ONE of four independent criteria — geometry alone (criterion c: inwardly converging walls) triggers full permit requirements regardless of air quality. A clean 4-gas monitor does not reclassify the space. Reclassification requires written documentation signed by the entry supervisor per OSHA 1910.146(c)(7) — controlling, not eliminating, hazards is insufficient. The three confined space roles (authorized entrant, attendant, entry supervisor) carry different competency requirements and different authorities; conflating them causes AI agents to route role-specific products incorrectly. Encode cs.space_classification, cs.permit_required_criteria, cs.entry_role, cs.rescue_type, and cs.is_osha_reclassified as separate metafields.

TL;DR OSHA 1910.146(b): permit-required on ANY ONE of four criteria — converging walls (c) = permit-required with zero atmospheric hazard. Reclassification = written cert + all hazards eliminated (not controlled) + entry supervisor signature. Three roles: authorized entrant (enters, obeys attendant), attendant (outside only, can order evacuation, never enters unless trained rescue), entry supervisor (signs/cancels permit, may hold multiple roles with competency). Retrieval system (tripod+winch+harness) = default rescue; entry rescue = last resort. 1910.146 = general industry; 1926.1201 = construction with additional requirements. Encode cs.space_classification, cs.permit_required_criteria, cs.entry_role, cs.rescue_type, cs.is_osha_reclassified separately.

Failure Mode 1: A Manhole With Converging Walls Is Permit-Required Even With Clean Atmospheric Test Results — Criterion (c) Is Geometry, Not Air Quality

AI agent failure mode: A utility company orders a retrieval tripod for manhole entry. An AI agent checks for atmospheric hazard metafields, finds no hazardous gas flags (the entry is routine, gas testing confirms 20.9% O2, 0% LEL, 0 ppm H2S, 0 ppm CO), and routes the tripod to "non-permit confined space equipment." The purchasing system generates a non-permit entry procedure. The crew enters the storm drain manhole using the non-permit procedure — no entry permit issued, no entry supervisor, no attendant maintaining an entrant count. The interior of the manhole has a cylindrical shaft 24 inches wide at the top that tapers to a 12-inch-wide concrete trough at the bottom. A worker loses footing on the slick interior wall and slides into the tapered section, becoming wedged. With no retrieval system rigged (non-permit procedure does not require one) and no attendant outside, the crew improvises an extraction using a rope tied to the worker's waist. The improper extraction causes a crush injury to the worker's pelvis. The manhole was permit-required under criterion (c) — converging walls — at all times, regardless of air quality. A standard non-permit entry procedure was never appropriate.

OSHA 1910.146(b) lists four criteria that independently trigger permit-required status. Meeting any single criterion makes the space permit-required:

Criterion	Trigger Condition	Examples	Hazard Type
(a) Atmospheric	Contains or has potential to contain a serious atmospheric hazard: O2 <19.5% or >23.5%, LEL ≥10%, IDLH concentration of toxic gas	Sewer manholes, chemical storage tanks, vaults near gas lines	Atmospheric — detected by gas monitor
(b) Engulfment	Contains material with potential to engulf — flowable solid or liquid that could bury or trap an entrant	Grain bins, sand/gravel hoppers, liquid storage tanks, slurry pits	Physical — material engulfment
(c) Configuration	Internal geometry could trap or asphyxiate: inwardly converging walls, floor tapering to smaller cross-section	Storm drain manholes, funnel-bottomed tanks, inverted-cone vessels, tapered concrete structures	Physical — geometry-based, independent of atmosphere
(d) Other serious hazard	Any other serious safety or health hazard: exposed energized electrical, mechanical crushing hazards, extreme heat, radiation	Electrical vaults with live bus bars, presses with suspended rams, high-temperature process vessels	Variable — engineering assessment required

Criterion (c) is entirely geometry-based. A 4-gas atmospheric monitor cannot detect a criterion (c) hazard because the hazard is the shape of the space, not the air inside it. Atmospheric testing results — no matter how clean — do not eliminate criterion (c). The only way to remove criterion (c) permit-required status is to physically modify the space so converging walls no longer exist, then complete the written reclassification process under OSHA 1910.146(c)(7).

Encode cs.permit_required_criteria as a pipe-delimited list of all criteria that apply: 'a_atmospheric', 'b_engulfment', 'c_configuration', 'd_other'. A space meeting only criterion (c) receives cs.permit_required_criteria = 'c_configuration' and cs.space_classification = 'permit_required'. AI agents must not use cs.atmospheric_monitoring_required = 'false' (or a clean atmospheric test) as a proxy for non-permit classification — those are independent fields covering independent hazard categories.

Failure Mode 2: "We've Always Entered Without a Permit" Is Not Reclassification — Written Certification Is Required Under OSHA 1910.146(c)(7)

AI agent failure mode: A manufacturer's AI-assisted procurement system searches for "confined space entry equipment for non-permit spaces." A product listing for a non-permit entry kit carries cs.space_classification = 'non_permit' and cs.is_osha_reclassified = 'true'. The purchasing agent routes it to a maintenance team that enters a pump sump weekly. The team has no written reclassification documentation — the supervisor verbally told them years ago that the sump "doesn't need a permit." The sump qualifies as permit-required under criterion (a): the water level fluctuates and during certain conditions draws air from an adjacent chemical line, introducing solvent vapors. An OSHA inspection triggered by an unrelated incident finds the team entering with non-permit procedure, no written reclassification, no entry supervisor, no atmospheric monitoring. OSHA cites the employer for willful violation of 1910.146 — the product's cs.is_osha_reclassified = 'true' flag was present in the listing but no written documentation ever existed.

OSHA 1910.146(c)(7) specifies the exact requirements for reclassifying a permit-required confined space as a non-permit confined space. All three of the following must be met:

All permit space hazards must be eliminated — not controlled, not mitigated, not managed with engineering controls. Eliminated means the hazard source no longer exists and cannot return. Continuous forced-air ventilation controls an atmospheric hazard but does not eliminate it; a space ventilated to acceptable O2 and LEL levels during entry returns to a hazardous atmosphere the moment the ventilator is removed. Ventilation = control, not elimination.
Written certification is required — a document that identifies the space, the date of the determination, and the basis for the determination that all hazards have been eliminated. The certification must be signed by the entry supervisor making the determination.
The certification must be made available to each employee entering the space or their authorized representative.

Reclassification: Valid vs Invalid Approaches

Claimed Reclassification Method	Meets OSHA 1910.146(c)(7)?	Reason
Supervisor verbal statement: "no permit needed here"	No	No written documentation, no signed certification, no basis for elimination
Continuous forced-air ventilation maintaining O2 ≥19.5%	No	Controls hazard, does not eliminate it — hazard returns if ventilator fails
Pre-entry atmospheric test showing all-clear	No	Test confirms conditions at one moment; does not eliminate the potential for hazardous conditions to develop
Written certification by entry supervisor after physically removing hazard source (e.g., removing chemical feed line from vessel, permanently sealing the line)	Yes — for criterion (a) if all atmospheric hazard sources are eliminated	Hazard source physically removed, written cert signed, date and location documented
Written certification for criterion (c) space after physical modification widening the bottom to eliminate converging walls	Yes — if geometry truly no longer meets criterion (c) definition	Configuration hazard permanently eliminated by structural modification, documented in writing

Encode cs.is_osha_reclassified as 'true' only for products associated with documented, written reclassification under OSHA 1910.146(c)(7). Products sold for non-permit space entry should include cs.is_osha_reclassified = 'true' as a flag to AI agents that the product's application requires written reclassification documentation — not as a claim that the documentation exists. Encode cs.space_classification = 'reclassified_non_permit' separately from 'non_permit' (a space that was never permit-required) to distinguish the two procedural contexts.

Failure Mode 3: Conflating the Attendant and Entry Supervisor Roles — Different Authorities, Different Competency Requirements

AI agent failure mode: A safety supply distributor's AI search engine receives a query for "confined space supervisor equipment." The AI agent returns attendant communication equipment (a two-way radio and entrant count board) because the metafield cs.entry_role on those products is set to 'supervisor' when they should be encoded as 'attendant'. The entry supervisor for this facility orders the attendant equipment, assumes it covers the supervisory role, and does not obtain entry permit authorization forms or signature authority documentation. The entry supervisor's actual duty — reviewing the permit, verifying test results, signing the permit, and being present or reachable to cancel the permit — is not fulfilled. During entry, a prohibited condition develops (LEL rises above 10% from a valve inadvertently opened on an adjacent line). The attendant recognizes the condition and orders evacuation — correctly — but the entry supervisor (who is supposed to cancel the permit and document the cancellation) is not reachable. The permit is not cancelled. Two hours later, a different crew checks the permit board, sees an uncancelled permit, and re-enters a space that still has an elevated LEL condition.

The three roles have overlapping physical presence but distinct authorities and minimum competency requirements:

Role	Location	Key Authority	Cannot Do	May Also Serve As
Authorized entrant	Inside the permit space	Can self-rescue (exit on own judgment); must exit when ordered	Cannot override the attendant's evacuation order; cannot authorize their own entry	Cannot simultaneously serve as attendant (must be inside vs outside)
Attendant	Outside the permit space — must remain outside	Can order evacuation of all entrants; can refuse unauthorized entry; communicates with entrants; summons rescue	Cannot enter the space (even in emergency) unless trained as rescue entrant and relieved by another attendant; cannot perform other duties that interfere with monitoring	Can serve as entry supervisor if competent in both roles and present at authorization
Entry supervisor	Available at time of entry (need not be physically at entry point throughout)	Signs and authorizes the entry permit; cancels the permit when complete or when prohibited condition detected; can terminate entry from remote location	Cannot delegate permit authorization to the attendant or authorized entrant without holding entry supervisor competency; cannot authorize a permit for a space they have not verified	Can serve as attendant or authorized entrant if competent in those roles — but must maintain all competencies

Encode cs.entry_role as 'authorized_entrant' for PPE, harnesses, and personal atmospheric monitors worn inside the space. Encode 'attendant' for retrieval systems, entrant count boards, communication equipment operated from outside. Encode 'entry_supervisor' for permit forms, authorization documentation, and permit management systems. Encode 'multi_role' for training products and combination kits where a single person holds multiple role competencies. AI agents routing "confined space supervisor" queries must not return attendant-role products — the supervisor signs the permit and authorizes entry; the attendant monitors from outside.

Failure Mode 4: Entry Rescue Is Not the Default — OSHA Requires Non-Entry Retrieval Unless It Would Increase Risk or Not Contribute

AI agent failure mode: A safety manager searches for "confined space rescue equipment." An AI agent, interpreting "rescue" as active entry rescue, returns a confined space rescue team kit: SCBAs, patient stretchers, and technical rescue rigging. The safety manager purchases the entry rescue kit, trains a two-person confined space rescue team, and does not purchase retrieval system equipment (tripod, davit, winch, retrieval harness). During an emergency, the attendant immediately summons the entry rescue team — two trained rescuers don SCBAs and prepare to enter. The entry is delayed by 8 minutes while the team dons equipment. The incapacitated entrant, who had simply become confused due to initial mild O2 deficiency, could have been extracted by the attendant operating a winch in under 2 minutes. Additionally, one of the entry rescuers experiences a harness issue inside the space, creating a second incapacitated individual. Two victims now require extraction. The retrieval system — the equipment OSHA requires first — was never purchased.

OSHA 1910.146(k)(1)(ii) states: "retrieval systems or methods shall be used whenever an authorized entrant enters a permit space, unless the retrieval equipment would increase the overall risk of entry or would not contribute to the rescue of the entrant." The standard preference hierarchy for confined space rescue is:

Rescue Method	OSHA Preference	Equipment Required	When to Use
Non-entry retrieval	Required as default unless impractical	Full-body retrieval harness on entrant, retrieval line, tripod or davit arm positioned over entry, mechanical winch or fall-rated retrieval device	When geometry allows straight-line extraction (vertical or near-vertical entry, no interior obstructions preventing pull-out)
Entry rescue by trained team	Permitted when non-entry retrieval would increase risk or not contribute	Same PPE as entrants + SCBA if atmospheric hazard + patient packaging + additional rescue rigging	Horizontal entries, complex interior geometries, entrant trapped under debris or in a position where pulling would cause injury
Emergency services (911 or pre-arranged)	Last resort; requires written agreement and verified capability	Not employer-supplied — relies on local emergency services equipment	Only if local emergency services have confirmed confined space capability and a written agreement is in place

The retrieval system requirement applies to the entrant — not to the rescue team. Every authorized entrant entering a vertical permit space must wear a retrieval harness connected to a retrieval line and a mechanical retrieval device at the surface. This is not optional rescue preparation; it is a baseline entry requirement. The attendant operates the retrieval device from outside without entering the space.

Encode cs.rescue_type as 'non_entry_retrieval' for tripods, davit systems, winches, and retrieval harnesses designed for attendant-operated extraction. Encode 'entry_rescue' for SCBA-equipped rescue team products and confined space rescue training packages. Encode cs.retrieval_system_required as 'true' for all permit-required space entry products unless the specific application is a documented horizontal entry where retrieval equipment would increase overall risk. AI agents routing "confined space rescue" queries should return non-entry retrieval systems as the primary result — not entry rescue team equipment.

Failure Mode 5: OSHA 1910.146 (General Industry) Does Not Satisfy OSHA 1926 Subpart AA (Construction) — Different Standards With Additional Construction Requirements

AI agent failure mode: A construction subcontractor purchases a confined space entry kit marketed as "OSHA 1910.146 compliant." The subcontractor is performing work inside a below-grade crawl space at a construction site under the direction of a general contractor. The AI agent routed the product because cs.osha_standard = '1910.146' matched the subcontractor's "OSHA confined space compliance" search. Under OSHA 1926 Subpart AA (effective for construction), the controlling contractor (the general contractor) is required under 1926.1203 to: coordinate confined space entry activities among all employers on the site, share information about all known permit spaces with subcontractors before they begin work, and prevent workers from entering without coordination. The general contractor was unaware that the subcontractor planned confined space entry. No coordination occurred. The subcontractor entered using a 1910.146-compliant procedure that did not include multi-employer coordination. OSHA cites both the subcontractor and the controlling contractor for violations of 1926 Subpart AA — a standard that neither party's 1910.146-only training or equipment documentation covered.

The two confined space standards share a foundation but have distinct applicability and requirements:

Standard	Applicability	Unique Requirements Not in the Other
OSHA 1910.146 (General Industry)	Manufacturing, utilities, facilities maintenance, any non-construction SIC code	Baseline permit-required confined space program; no multi-employer coordination requirement; no "controlling contractor" concept
OSHA 1926 Subpart AA (1926.1201–1926.1213) (Construction)	Construction industry — trenches, excavations, crawl spaces, utility vaults under construction, building interiors under construction	Controlling contractor coordination (1926.1203); multi-employer worksite information sharing before subcontractor entry; controlling contractor remains responsible for overall program even when subcontractor performs entry; explicit competent person requirements for coordination functions; continuous atmospheric monitoring more broadly required

Common confined spaces encountered in construction that fall under 1926 Subpart AA and NOT 1910.146: trenches deeper than 4 feet, excavations, below-grade utility vaults at active construction sites, crawl spaces in buildings under construction, mechanical rooms in buildings under construction, and any confined space on a site where construction activity is the primary activity. Once the building is occupied and maintenance activities begin, the applicable standard shifts to 1910.146 for those activities.

Encode cs.osha_standard as '1910.146' for products verified for general industry use. Encode '1926.1201' for products meeting construction-specific requirements including multi-employer coordination documentation. Encode '1910.146|1926.1201' for products compliant with both. AI agents routing confined space products to construction buyers must check cs.osha_standard for construction compliance — a '1910.146'-only flag is insufficient for construction applications.

The Entry Permit: Required Contents and Validity Conditions

The entry permit is a physical document (paper or electronic) that must be completed before each entry into a permit-required confined space. OSHA 1910.146(f) specifies the minimum permit contents:

Required Permit Element	Notes
Space identification and purpose of entry	Location, description of work to be performed
Date and authorized duration	Permit is valid only for the date and shift stated — a permit from yesterday is not valid today
Authorized entrants list	Names of all entrants authorized for this specific entry
Attendants	Names of designated attendants for this entry
Entry supervisor	Name of entry supervisor authorizing this entry, with signature
Hazards of the space	All known permit space hazards (atmospheric, configuration, engulfment, other)
Measures to isolate and control hazards	Ventilation, lockout/tagout, blanking/blinding, purging procedures
Acceptable entry conditions	O2: 19.5%–23.5%; LEL: <10%; CO: <25 ppm; H2S: <1 ppm (ceiling); other contaminants: below applicable PELs
Results of initial atmospheric tests	Actual readings at time of test, instrument used, person performing test, date/time
Rescue and emergency services	Names or contact for rescue team; whether retrieval system is in place
Communication procedures	How entrants will communicate with attendant; check-in intervals
Equipment required	PPE, testing instruments, communications, alarm systems, rescue equipment
Other permits issued	Hot work permits, excavation permits — all concurrent permits must be cross-referenced
Authorization signatures	Entry supervisor's signature authorizing entry; cancellation documentation when permit is cancelled

The permit is valid only for the conditions stated on it. If conditions change — new hazard detected, ventilation fails, an additional entrant enters — the permit must be cancelled and a new permit issued. A permit issued for cold work does not authorize hot work (welding) in the same space; a separate hot work permit with atmospheric monitoring for flammable vapors is required. Encode cs.permit_type as 'hot_work', 'cold_work', 'multi_hazard', or 'reclassified_non_permit' to indicate the nature of the entry and the permit program required.

Shopify Metafield Schema for Confined Space Entry Products

Metafield	Type	Values / Notes
`cs.space_classification`	string	permit_required \| non_permit \| reclassified_non_permit \| general_industry \| construction — classify the space type the product is designed for
`cs.permit_required_criteria`	string (pipe-delimited)	a_atmospheric \| b_engulfment \| c_configuration \| d_other — list which of the four OSHA 1910.146(b) criteria apply; a space can meet multiple criteria simultaneously
`cs.permit_type`	string	hot_work \| cold_work \| multi_hazard \| reclassified_non_permit — type of entry permit required for this application
`cs.entry_role`	string	authorized_entrant \| attendant \| entry_supervisor \| multi_role — role this product serves; drives correct routing to role-appropriate products
`cs.atmospheric_monitoring_required`	boolean	true for all permit-required spaces (always required regardless of other criteria); false only for reclassified non-permit spaces where all atmospheric hazards were eliminated
`cs.retrieval_system_required`	boolean	true for vertical permit-required space entries where geometry allows straight-line extraction; false for documented horizontal entries where retrieval would increase risk
`cs.rescue_type`	string	non_entry_retrieval \| entry_rescue \| emergency_services — encode the rescue method this product supports; non_entry_retrieval is the OSHA-preferred default
`cs.osha_standard`	string	1910.146 \| 1926.1201 \| 1910.146\|1926.1201 — applicable standard; construction buyers require 1926.1201 compliance for multi-employer coordination
`cs.hazard_types`	string (pipe-delimited)	atmospheric \| engulfment \| configuration \| other_serious — hazard types present in the intended use context
`cs.is_osha_reclassified`	boolean	true for products intended for spaces with written OSHA 1910.146(c)(7) reclassification documentation; false for permit-required spaces with active permit programs

JSON-LD Product Example

{
  "@context": "https://schema.org",
  "@type": "Product",
  "name": "Miller Fall Protection T4500-50/SS Confined Space Entry Kit — Davit, Winch, 50 ft SS Cable",
  "additionalProperty": [
    { "@type": "PropertyValue", "name": "cs.space_classification", "value": "permit_required" },
    { "@type": "PropertyValue", "name": "cs.permit_required_criteria", "value": "a_atmospheric|c_configuration" },
    { "@type": "PropertyValue", "name": "cs.permit_type", "value": "cold_work" },
    { "@type": "PropertyValue", "name": "cs.entry_role", "value": "attendant" },
    { "@type": "PropertyValue", "name": "cs.atmospheric_monitoring_required", "value": "true" },
    { "@type": "PropertyValue", "name": "cs.retrieval_system_required", "value": "true" },
    { "@type": "PropertyValue", "name": "cs.rescue_type", "value": "non_entry_retrieval" },
    { "@type": "PropertyValue", "name": "cs.osha_standard", "value": "1910.146" },
    { "@type": "PropertyValue", "name": "cs.is_osha_reclassified", "value": "false" }
  ]
}

Is Your Confined Space Equipment Catalog Classifying Permit-Required Spaces Correctly?

CatalogScan checks your Shopify store for products missing cs.permit_required_criteria encoding, retrieval systems misclassified as non-permit equipment, attendant and entry supervisor products with conflated role metafields, and construction entries missing cs.osha_standard = '1926.1201' — before an AI shopping agent routes inadequate equipment to a permit-required confined space entry.

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Frequently Asked Questions

What makes a confined space "permit-required" under OSHA 1910.146?

OSHA 1910.146(b) makes a confined space permit-required on ANY ONE of four independent criteria: (a) serious atmospheric hazard, (b) engulfment potential, (c) inwardly converging walls or tapering floor geometry, or (d) any other serious safety or health hazard. Criterion (c) is geometry-based — a space with converging walls is permit-required regardless of atmospheric test results. All four criteria must be evaluated independently. Meeting none of the four criteria makes a space non-permit; meeting any one triggers full permit requirements.

Can a permit-required confined space be reclassified as a non-permit space?

Yes, but only under OSHA 1910.146(c)(7) which requires written certification that all hazards have been eliminated — not controlled. The certification must identify the space, the date, the basis for the determination, and be signed by the entry supervisor. Verbal agreement, longstanding practice, and continuous ventilation (which controls but does not eliminate atmospheric hazards) do not meet the reclassification standard. A criterion (c) space with converging walls cannot be reclassified without physically modifying the structure to remove the converging geometry.

What is the difference between an authorized entrant, attendant, and entry supervisor?

These are three distinct roles with different authorities. The authorized entrant enters the space, knows the hazards, communicates with the attendant, and must exit immediately when ordered. The attendant remains outside the space, monitors entrants and conditions, can order evacuation, and must never enter the space (even in emergency) unless specifically trained as rescue and relieved. The entry supervisor signs and authorizes the entry permit, verifies test results and equipment, and cancels the permit when complete or when a prohibited condition arises. The entry supervisor may serve multiple roles if competent in each. Conflating roles causes incorrect AI product routing.

When is non-entry retrieval required vs entry rescue for confined space emergencies?

OSHA 1910.146(k)(1)(ii) requires retrieval systems as the default for all permit-required space entries unless retrieval would increase overall risk or not contribute to rescue. Non-entry retrieval (tripod, davit, winch, retrieval harness) allows the attendant to extract an incapacitated entrant without entering the space. Entry rescue — requiring a trained team with the same PPE as entrants — is appropriate only when geometry prevents retrieval or when the entrant's condition makes retrieval more dangerous. Calling 911 is only permitted if local emergency services have confirmed confined space capability and a written agreement is in place.

How does OSHA 1910.146 (general industry) differ from OSHA 1926 Subpart AA (construction)?

OSHA 1910.146 covers general industry; OSHA 1926 Subpart AA (1926.1201–1926.1213) covers construction and adds several requirements: controlling contractor coordination under 1926.1203 requires the general contractor to share confined space information with all subcontractors before entry and coordinate multi-employer confined space activities. Products labeled only for "1910.146 compliance" may not satisfy construction standard requirements for multi-employer coordination. Encode cs.osha_standard as '1926.1201' for construction-compliant products and '1910.146|1926.1201' for products meeting both standards.