Peru Resolución Ministerial N° 375-2008-TR (28 Nov 2008) approves the Norma Básica de Ergonomía y de Procedimiento de Evaluación de Riesgo Disergonómico. Anexo item 26 defines WBGT measurement; item 27 gives WBGT limit values by work/rest regime, workload and acclimatization (credited to ACGIH, ISO 7243). Item 28 (air velocity) is not modelled.
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Outdoors with solar load: WBGT = 0.7·Tbh + 0.2·Tg + 0.1·Tbs. Indoors or without solar load: WBGT = 0.7·Tbh + 0.3·Tg.| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 30 / 30 min work/rest per hr |
| 25 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 30 / 30 min work/rest per hr |
| 26 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 30 / 30 min work/rest per hr |
| 27 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 45 / 15 min work/rest per hr | 30 / 30 min work/rest per hr |
| 28 | 60 / 0 min work/rest per hr | 45 / 15 min work/rest per hr | 30 / 30 min work/rest per hr | 15 / 45 min work/rest per hr |
| 29 | 60 / 0 min work/rest per hr | 30 / 30 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr |
| 30 | 45 / 15 min work/rest per hr | 15 / 45 min work/rest per hr | 15 / 45 min work/rest per hr | Stop work |
| 31 | 30 / 30 min work/rest per hr | 15 / 45 min work/rest per hr | Stop work | Stop work |
| 32 | 15 / 45 min work/rest per hr | Stop work | Stop work | Stop work |
| 33 | Stop work | Stop work | Stop work | Stop work |
| 34 | Stop work | Stop work | Stop work | Stop work |
| 35 | Stop work | Stop work | Stop work | Stop work |
| 36 | Stop work | Stop work | Stop work | Stop work |
| WBGT (°C) | Light 180 W | Moderate 300 W | Heavy 415 W | Very heavy 520 W |
|---|---|---|---|---|
| 24 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 45 / 15 min work/rest per hr | 30 / 30 min work/rest per hr |
| 25 | 60 / 0 min work/rest per hr | 60 / 0 min work/rest per hr | 30 / 30 min work/rest per hr | 30 / 30 min work/rest per hr |
| 26 | 60 / 0 min work/rest per hr | 45 / 15 min work/rest per hr | 30 / 30 min work/rest per hr | 15 / 45 min work/rest per hr |
| 27 | 60 / 0 min work/rest per hr | 30 / 30 min work/rest per hr | 15 / 45 min work/rest per hr | Stop work |
| 28 | 45 / 15 min work/rest per hr | 30 / 30 min work/rest per hr | 15 / 45 min work/rest per hr | Stop work |
| 29 | 45 / 15 min work/rest per hr | 15 / 45 min work/rest per hr | Stop work | Stop work |
| 30 | 30 / 30 min work/rest per hr | Stop work | Stop work | Stop work |
| 31 | 15 / 45 min work/rest per hr | Stop work | Stop work | Stop work |
| 32 | Stop work | Stop work | Stop work | Stop work |
| 33 | Stop work | Stop work | Stop work | Stop work |
| 34 | Stop work | Stop work | Stop work | Stop work |
| 35 | Stop work | Stop work | Stop work | Stop work |
| 36 | Stop work | Stop work | Stop work | Stop work |
Required inputs: wbgtC, workload
Optional inputs: acclimatization
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Get notified when Peru RM 375-2008-TR Norma Básica de Ergonomía — WBGT Limit Values (items 26-27) changes — threshold changes, scope and legal-status changes, additions and removals. Changes that permit more heat exposure than before are labelled as such.
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