Hmm, Could not agree more Roy my fellow Tech. But everyone is using different formulas?, (try this link from our brother Alan Pakaln. I have a few more, which resolve differently.
web page link If we are going to carry out our own risk assessments OFFICIALLY,

then should it not be up to the MDA to get off their glutei and draught a standard we can all adhere to, after all is that not what the tax payer pays them for.
This is a problem gentleman, as Louis said earlier we also have a duty to the taxpayer.
Louis III
