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D.2 electrostatic charging of persons – Siemens Simatic S7-400 User Manual

Page 601

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Guidelines for Handling Electrostatic Sensitive Devices (ESD)

D-3

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

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

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

(kV
)

5 10 20 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 D-1

Electrostatic Voltages which Can Build up on a Person

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