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IS 17296:2020 is the Indian Standard (BIS) for safety in confined spaces - code of practice for construction. This code of practice outlines the requirements for ensuring safety during work in confined spaces in the construction industry. It covers hazard identification, risk assessment, permit-to-work systems, atmospheric testing, emergency rescue procedures, and training to prevent accidents, injuries, and fatalities.
Lays down requirements for identifying, entering, working in, and rescuing from confined spaces in construction.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! A 'Permit-to-Work' is a live safety document, not just a form to be filled. It requires active verification of all safety conditions before and during entry.
! Always assume a confined space is hazardous until proven otherwise through proper testing and risk assessment.
! A trained attendant must always be present outside the confined space to monitor the entrants and initiate emergency procedures if needed. The attendant must never enter the space themselves.
29 CFR 1926 Subpart AAOccupational Safety and Health Administration (OSHA), USA
HighCurrent
Confined Spaces in Construction
Directly addresses confined space safety specifically for the construction industry, mirroring the scope of IS 17296.
L101 (ACOP)Health and Safety Executive (HSE), UK
HighCurrent
Safe work in confined spaces. Confined Spaces Regulations 1997. Approved Code of Practice and guidance.
Provides a framework and code of practice applicable to all industries, including construction, with a strong focus on risk assessment.
Model Code of Practice: Confined SpacesSafe Work Australia, Australia
HighCurrent
Model Code of Practice: Confined Spaces
A comprehensive code of practice providing guidance for all workplaces, with principles directly transferable to construction.
29 CFR 1910.146Occupational Safety and Health Administration (OSHA), USA
MediumCurrent
Permit-required confined spaces
Covers confined spaces for general industry, from which many principles in the construction-specific standards are derived.
Key Differences
≠IS 17296 is a 'Code of Practice' (guidance/recommendation), whereas OSHA 29 CFR 1926 is a mandatory legal regulation with direct penalties for non-compliance.
≠OSHA 1926.1211 mandates specific rescue practice frequency (at least annually), while IS 17296 Annex D recommends 'regular drills' without defining a specific interval.
≠The UK's HSE L101 does not mandate a 'standby person/attendant' for every single entry, making it subject to risk assessment. IS 17296 requires an attendant for all permit entries.
≠IS 17296 requires entry permits to be retained for at least 3 months, whereas OSHA 1926 requires retention for at least 1 year to facilitate annual program reviews.
Key Similarities
≈All standards emphasize a formal Entry Permit System (Permit-to-Work) as the primary administrative control for managing entry into hazardous confined spaces.
≈The core principle of identifying hazards, conducting a risk assessment, and implementing controls before entry is fundamental to IS 17296 and all its international counterparts.
≈Pre-entry and continuous/periodic atmospheric monitoring for oxygen, flammability, and toxicity are universally required to ensure the atmosphere remains safe for entrants.
≈All standards mandate the development of a comprehensive emergency and rescue plan, including necessary equipment and trained personnel, before any entry is authorized.
≈A strong emphasis is placed on the training and proven competence of all personnel involved, including entrants, attendants, supervisors, testers, and rescue teams.
Parameter Comparison
Parameter
IS Value
International
Source
Oxygen Deficient Atmosphere
< 19.5%
< 19.5%
OSHA 29 CFR 1926.1202
Oxygen Enriched Atmosphere
> 23.5%
> 23.5%
OSHA 29 CFR 1926.1202
Flammable Atmosphere Action Level
Not to exceed 10% of LEL (Lower Explosive Limit)
Below 10% of LEL
OSHA 29 CFR 1926.1202
Toxic Atmosphere
Concentration above the Occupational Exposure Limit (OEL)
Concentration above the Permissible Exposure Limit (PEL)
OSHA 29 CFR 1926.1202
Rescue Team Practice Frequency
Regular drills should be carried out (Annex D)
At least once every 12 months (annually)
OSHA 29 CFR 1926.1211(d)
Entry Permit Retention Period
At least 3 months
At least 1 year
OSHA 29 CFR 1926.1205(f)
Mandatory Attendant/Standby Person
Required for each confined space entry.
Necessity determined by risk assessment; not mandatory for all entries.
HSE L101 (UK)
⚠ Verify details from original standards before use
Key Values5
Quick Reference Values
Minimum safe oxygen level19.5 % by volume
Maximum safe oxygen level23.5 % by volume
Maximum flammable gas concentration< 10 % of Lower Explosive Limit (LEL)
Maximum carbon monoxide (CO) concentration25 ppm (TWA)
Maximum hydrogen sulphide (H2S) concentration10 ppm (STEL)
Tables & Referenced Sections
Key Tables
Table 1 - Permissible Exposure Limits for Gases and Vapours
Annex A - Sample Format for Confined Space Entry Permit
Annex C - Checklist for Confined Space Entry
Key Clauses
Clause 4 - Classification and Identification of Confined Spaces
Clause 5 - Hazard Identification and Risk Assessment
What defines a confined space according to this code?+
It's a space with limited or restricted means for entry or exit, is not designed for continuous human occupancy, and has a known or potential hazard. (Clause 3.4)
What is the acceptable oxygen level for working in a confined space?+
The oxygen level must be between 19.5% and 23.5%. (Clause 8.3.2)
Is a written permit required for all confined space entries?+
Yes, a written permit-to-work is mandatory for entry into any identified permit-required confined space. (Clause 6)
How often should the atmosphere inside a confined space be tested?+
It must be tested before entry and monitored continuously or at frequent intervals while work is being performed. (Clause 8.2)