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)

IS 17296

: 2020

Safety in confined spaces - Code of practice for construction

CurrentSpecializedCode of PracticeBIMGeneral · Construction Safety and Practices

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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.

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)

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.