The Kerala (r.17A), Maharashtra (r.22A) and Madhya Pradesh (r.23) Factories Rules set a maximum wet-bulb temperature for factory workrooms at 1.5 m above floor level: 30 C, tightened by a schedule keyed on dry-bulb temperature, with air movement of at least 30 m/min.
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No standalone formula is published for this standard; see programmable logic and parameters below.
| Parameter | Value |
|---|---|
wetBulbCeilingC | 30 |
minAirMovementMPerMin | 30 |
measurementHeightM | 1.5 |
schedule | dryBulbFromC 30, dryBulbToC 34, maxWetBulbC 29, dryBulbFromC 35, dryBulbToC 39, maxWetBulbC 28.5, dryBulbFromC 40, dryBulbToC 44, maxWetBulbC 28, dryBulbFromC 45, dryBulbToC 47, maxWetBulbC 27.5 |
Programmable logic
Wet-bulb ceiling is 30 C. Dry-bulb 30-34 C: 29 C; 35-39 C: 28.5 C; 40-44 C: 28 C; 45-47 C: 27.5 C. A dry-bulb between two bands takes the value of the higher reading (e.g. 34.5 C uses the 35-39 band). If the black-globe thermometer (15 cm) reading exceeds the dry-bulb, the globe reading replaces dry-bulb. Dry-bulb below 30 C: only the 30 C ceiling applies (schedule starts at 30 C).
Dry-bulb above 47 C: schedule is silent; the 27.5 C row is applied as a conservative assumption. Screening limit: no work/rest schedule and no stop-work.
Not modelled: the Maharashtra/MP proviso that the allowed value may be exceeded to the same extent when the outside shade wet-bulb exceeds 27 C (no outside wet-bulb input); the exemption for s.15 factories and processes with unavoidably high temperatures; the 30 m/min air-movement duty is reported as a control.
Required inputs: wetBulbC, airTempC
Optional inputs: globeTempC
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