Siemens S7-400 - Electrostatic Charging of Persons

Guidelines for Handling Electrostatically-Sensitive Devices (ESD)
B-3
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
B.2 Electrostatic Charging of Persons
Charging
Every person with a non-conductive connection to the electrical potential of its
surroundings can be charged electrostatically.
Figure B-1 shows you the maximum values for electrostatic voltages which can
build up on a person coming into contact with the materials indicated in the figure.
These values are in conformity with the specifications of IEC 61000-4-2.
Voltage in kV
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
(kV
)
51020 30 40 50 60 70 80 90 100
Relative air
humidity in %
1
3
1 Synthetic material
2
Wool
3
Antistatic material, for
example, wood or concrete
2
Figure B-1 Electrostatic Voltages which can Build up on a Person