ISO 7243:2017
Ergonomics of the thermal environment — Assessment of heat stress using the WBGT (wet bulb globe temperature) index
ISO 7243:2017 presents a screening method for evaluating the heat stress to which a person is exposed and for establishing the presence or absence of heat stress.
It applies to the evaluation of the effect of heat on a person during his or her total exposure over the working day (up to 8 h).
It does not apply for very short exposures to heat.
It applies to the assessment of indoor and outdoor occupational environments as well as to other types of environment, and to male and female adults who are fit for work.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Method
5 Determination of WBGT
6 Determination of metabolic rate
7 Determination of effects of clothing
8 Timing and duration of measurements
8.1 Timing of measurements
8.2 Duration of measurements
9 Spatial and temporal variations
9.1 Measurement specifications relating to heterogeneity of environment (spatial variations)
9.2 Measurement specifications relating to time variations of WBGT index
9.3 Measurement specifications relating to time variations of metabolic rate
9.4 Measurement specifications relating to time variations of clothing
10 Interpretation
Annex A (informative) Reference values of the WBGT heat stress index
Annex B (normative) Measurement of parameters used in the WBGT index and specification of instruments
Annex C (informative) Alternative globe thermometers
Annex D (informative) Prediction of natural wet bulb temperature
Annex E (informative) Estimation of metabolic rate
Annex F (informative) Clothing adjustment values (CAVs)
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Method
5 Determination of WBGT
6 Determination of metabolic rate
7 Determination of effects of clothing
8 Timing and duration of measurements
8.1 Timing of measurements
8.2 Duration of measurements
9 Spatial and temporal variations
9.1 Measurement specifications relating to heterogeneity of environment (spatial variations)
9.2 Measurement specifications relating to time variations of WBGT index
9.3 Measurement specifications relating to time variations of metabolic rate
9.4 Measurement specifications relating to time variations of clothing
10 Interpretation
Annex A (informative) Reference values of the WBGT heat stress index
Annex B (normative) Measurement of parameters used in the WBGT index and specification of instruments
Annex C (informative) Alternative globe thermometers
Annex D (informative) Prediction of natural wet bulb temperature
Annex E (informative) Estimation of metabolic rate
Annex F (informative) Clothing adjustment values (CAVs)
Bibliography