Toshiba Aquilion TSX-101A/I Series Site Planning Manual page 67

(3) Suppression and prevention of static electricity (Antistatic measures for nonconductors)
1. Increasing relative humidity
As shown in tables A.1.2-2 and A.1.2-3, the generation of static electricity can be
prevented by increasing the relative humidity.
Table A.1.2-2 Dependence of generated static electricity voltage on relative
Static electricity generated by
Walking on a carpet
Walking on a vinyl floor
Working at a work table
Storing/removing work instructions in/from
a vinyl cover
Picking up an ordinary polyethylene bag
from a work table
Sitting on a work chair with a polyurethane
foam cushion
*: The voltage can be reduced to less than 1/10 by increasing the humidity.
Table A.1.2-3 Relationship between the humidity and the static electricity
Wool
Cotton
Viscose rayon
Acetate rayon
humidity
voltage for various fibers
Fiber
67
Static electricity voltage (V)
10% to 20% PH
35,000
12,000
6,000
7,000
20,000
18,000
Static electricity voltage (kV)
50% RH 65% RH
4.9 2.0
0.1 0.0
4.7 1.6
6.0 3.5
No. 2A201-519EN*A
65% to 90% PH
1,500
250
100
600
1,200
1,500
80% RH
0.8
0.0
0.5
3.3