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APPENDIX A: Heat Exposures Tables
Electrical power research institute (EPRI)
The recommended working hours are shown based on a maximum of four hours. A time of 4:01 indicates greater than 4 hours.
WBGT°C | Light | Moderate | Heavy |
28 | 4:01 | 4:01 | 3:00 |
29 | 4:01 | 4:00 | 2:00 |
30 | 4:01 | 3:00 | 1:30 |
31 | 4:01 | 2:00 | 1:15 |
32 | 4:00 | 1:30 | 1:00 |
33 | 3:30 | 1:15 | 0:45 |
34 | 3:00 | 1:00 | 0:40 |
35 | 2:30 | 0:53 | 0:35 |
36 | 2:00 | 0:45 | 0:30 |
37 | 1:45 | 0:40 | 0:25 |
38 | 1:30 | 0:35 | 0:20 |
39 | 1:15 | 0:33 | 0:18 |
40 | 1:00 | 0:30 | 0:15 |
41 | 0:53 | 0:28 | 0 |
42 | 0:45 | 0:25 | 0 |
43 | 0:38 | 0:23 | 0 |
44 | 0:30 | 0:20 | 0 |
45 | 0:28 | 0:18 | 0 |
46 | 0:25 | 0:15 | 0 |
47 | 0:23 | 0 | 0 |
48 | 0:20 | 0 | 0 |
49 | 0:18 | 0 | 0 |
50 | 0:15 | 0 | 0 |
