© Feb. 2023
10
TB20J Plus Operation Manual
IMPORTANT SAFETY RULES
Table 2-2
BEAUFORT
SCALE
WIND SPEED
DESCRIP-
TION
LAND CONDITIONS
METER/
SECOND
MILE/HOUR
0 0～0.2 0～0.5 Calm
Calm. Smoke rises vertically.
1 0.3～1.5 1～3
Light air Direction of wind shown by smoke drift.
2 1.6～3.3 4～7
Light breeze
Wind felt on exposed skin. Leaves rustle.
3 3.4～5.4 8～12
Gentle
breeze
Leaves and smaller twigs in constant motion.
4 5.5～7.9 13～18
Moderate
breeze
Dust and loose paper rise. Leaves and smaller
twigs in constant motion.
5 8.0～10.7 19～24 Fresh breeze
Smaller trees sway.
6 10.8～13.8 25～31
Strong
breeze
Large branches in motion. Flags waving near
horizontal. Umbrella use becomes difficult.
7 13.9～17.1 32～38
Near gale/
moderate
gale
Whole trees in motion. Effort needed to walk
against the wind.
8 17.2～20.7 39～46
Fresh gale Twigs broken from trees. Cars veer on road.
9 20.8～24.4 47～54
Strong gale Light structure damage.
If the wind speed increases to exceed 12.5m/s (28mph) after the platform is raised, the platform should be
retracted immediately, and then all power supplies should be cut off, and the machine should be stopped.
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