confined space.
2. Ensure that the confined space is positively isolated from your source of energy
and has been made free from harmful gases.
3. Proper ventilation and illumination of space must be ensured.
4. Wherever forced ventilation is used. The gas test should be carried out after
minimum 10 minutes of stopping the eductor / fan / blower.
5. Thorough gas test must be carried out before issuing permit to ensure that there is
no pocket of gas available inside and the place is safe for performing the
particular task inside confined space. For entry of person the concentration of
toxic gases should not exceed TLV and oxygen must be minimum 19.5 % by
volume.