KEM WBGT-301, Operation Manual

Page: 38 / 41

３８
WBGT Criteria According To Physical Work Load
（ WBGT-302 ）
Category
Example of physical work load
(metabolite rate level)
WBGT criteria
Heat
Acclimated
Heat
Unacclimated
0
Rest
Complete rest, Comfortable sitting position 33 °C 32 °C
1
Low
metabolic
rate
Light handwork (writing, typing, drawing, sewing,
bookkeeping); Hand and arm movements (small
bench tool, inspection, assembly or sorting light
materials); Arm and leg movements (driving under
normal conditions, operating a foot switch or a pedal).
Standing ； Drilling (a small part); Milling machine (a
small part); Coiling; Winding small armatures;
Machines operated by small power; Walking on flat
ground less than 2.5 km/h.
30 °C 29 °C
2
Moderate
metabolic
rate
Head and arm movements on a continuous basis
(nailing, raising ground level); Arm and leg movements
(Off-road driving of a truck, a tractor and a
construction vehicle); Arm and body movements
(working with air hammer, assembling a tractor,
plastering, intermittent moderate lifting work,
weeding, digging up glasses, Harvesting fruits and
vegetables); Pushing/pulling a cart and a handcart
with light load; Walking on flat ground at 2.5 to 5.5
km/h; Forging
28 °C 26 °C
3
Heavy
metabolic
rate
Heavy arm and body movements ； Carry heavy
materials ； Shoveling; Operations with a hammer;
Sawing; Planing or chiseling hard wood; Mowing;
Digging; Walking on flat ground at 5.5 to 7 to km/h.
Pushing/pulling a cart and a handcart with heavy
load; scraping castings; stacking concrete blocks.
26 °C 23 °C
4
Very
heavy
metabolic
rate
Intense activities at the maximum speed; Axing;
shoveling very hard; Climbing a stairway, Running on
flat ground, Walking on flat ground at more than
7km/h.
25 °C 20 °C
* A heat acclimated person is defined as "a person who had an exposure to high
temperature work conditions (or similar or more extreme conditions) for at least one
week before the assessment period and for a similar full work period.
Reference: Health, Labour and Welfare Ministry, “Outline of Basic Measures for Preventing
Heatstroke in the Workplace" Table 1-1
(Based on JIS Z 8504 Annex A "Reference Values for WBGT Heat Stress Index"
by replacing metabolic levels with examples.)