Siemens S7-400 installation manual Electrostatic Charging of Persons

Guidelines for Handling Electrostatically-Sensitive Devices (ESD)

B.2 Electrostatic Charging of Persons

Charging

Every person with a non-conductive connection to the electrical potential of its surroundings is subject to electrostatic charge.

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
(kV)
16	1	Synthetic material
15	2	Wool
14
13	3	Antistatic material, for
12
		example, wood or concrete
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		Relative air
			humidity in %

Figure B-1 Electrostatic Voltages which can build up on a person

Automation System S7-400	Hardware and Installation	B-3
A5E00850741-01