Siemens Simatic M7-400 Reference Manual page 601

D.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 D-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
(kV
)
Figure D-1
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Guidelines for Handling Electrostatic Sensitive Devices (ESD)
16
15
14
13
12
11
1
10
9
8
7
6
5
4
2
3
2
3
1
5 10 20 30 40 50 60 70 80 90 100
Electrostatic Voltages which Can Build up on a Person
1 Synthetic material
2 Wool
3 Antistatic material,
for example, wood
or concrete
Relative air
humidity in %
D-3