Title: +038=627.001-##001T_03-Fasadevasksystem NorAcon - International Code of Practice (ICOP).pdf
O.4.3.2 In Safety in the Heat, a Thermal Work Limit (TWL) is determined and guidance given on work/rest schedules, rehydration schedules and work restrictions, called interventions: see Table O.4.3, which has been taken from the EHSMS Safety in the Heat programme and modified by IRATA for rope access purposes.TWL is a heat stress index, validated for Gulf conditions, which has been researched and O.4.3.3 adopted by the Health Authority Abu Dhabi to enable safe management of work in heat. It gives a measure of the maximum safe work rate for the conditions. If the TWL is too low, even low rates of work cannot safely be carried out continuously.Instruments are available to carry out the measurements required to compute the TWL. O.4.3.4 Information on these instruments is available from HAAD. Care should be taken to perform measurements at the working location itself rather than at easier to reach locations nearby, especially as temperature levels can vary a lot depending on the height.