Rank: New forum user 
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Dear Members, I am interested to know the current UK’s Permissible Exposure Limits when entering enclosed space. Greatly appreciate your kind assistance Best regards Gordon
PS : limit of toxic gas
Hydrocarbon Gas (CH4) Carbon monoxide (CO)
Hydrogen Sulphide (H2S)
Benzene
Edited by user 26 July 2018 08:33:31(UTC)
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Rank: Super forum user 
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Limits for oxygen, flammable gases, etc when entering confined spaces are not laid down in legislation in the UK but have to be determined by company policy based on risk assessment and so can vary a bit.
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 1 user thanked Kate for this useful post.
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Rank: Super forum user 
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Permissible exposure levels to what - Heat, duration of works, gas levels, contaminants...? Sorry you will need to be a little bit more specific with your question There are the EH40 Work place Exposure Limits published by HSE, and more recently a lot of information is comming forward on what are termed DNEL (Derived No Effect Limits) which consider groups (workers / genmeral population) and routes of exposure
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Rank: Super forum user
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Permissible exposure levels to what - Heat, duration of works, gas levels, contaminants...? Sorry you will need to be a little bit more specific with your question There are the EH40 Work place Exposure Limits published by HSE, and more recently a lot of information is comming forward on what are termed DNEL (Derived No Effect Limits) which consider groups (workers / genmeral population) and routes of exposure
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Rank: Super forum user
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Simple: there isn’t one. Is all down to YOUR risk assessment. First you must identified the enclosed area and decide if it qualifies as a Confined Space under the regulations. If it does then you must decide if you actual require entry or if you can avoid it. If it is unavoidable (SFARP) then you need to apply suitable controls including means of escape/rescue. There are no statutorily defined levels of gas or oxygen which automatically make it a Confined Space.
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1 user thanked A Kurdziel for this useful post.
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Rank: Super forum user
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Thanks for clarifying the question, Gordon.
Legal workplace exposure limits (WELs) for toxic substances are laid down in EH40 as Roundtuit mentioned. You can find it here: http://www.hse.gov.uk/pubns/priced/eh40.pdf
However, these are not simply maximum permissible levels as there is also a duty to make the exposure as low as reasonably practicable. It is illegal to exceed these levels, but being under them doesn't mean it is necessarily OK, you still (as a legal duty) need to look at how you can reduce exposure as far as you can below the limits.
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