How Hot It Is for the Person Working in It HEAT
Seven tenths of the index is the wet bulb, because humidity is most of what decides whether sweat does anything. A humid thirty beats a dry thirty-five.
The readings
Ordinary work clothes are the baseline. Coveralls add a couple of degrees to the effective index and a vapour-barrier suit a great deal more, and that heat is real even though no instrument on site reads it.
What the hour looks like
Every kind of work at this index
The criteria
Kind of workWatts100% work75%50%25%
These are the usual published screening figures for acclimatised workers, and they are editable because they are revised and they differ. A zero means the standard gives no figure for that combination, which is itself an answer.
The working
Heat illness is a medical matter. Somebody who has stopped sweating, or who is confused, is an emergency and not a rota problem.
Questions people ask about HEAT