Siemens SIMATIC ET 200SP System Manual page 269

Technical specifications
14.1 Standards, approvals and safety notes
Safety information
Personal injury and damage to property may occur
In hazardous areas, personal injury and damage to property may occur if you disconnect
plug-in connections during operation of an ET 200SP distributed I/O system.
Always switch off the power to the ET 200SP distributed I/O system when disconnecting
plug-in connections in hazardous areas.
Explosion hazard
If you replace components, compliance with Class I, Div. 2 or zone 2 may become invalid.
Area of application
This device is only suitable for use in Class I, Div. 2, Group A, B, C, D; Class I, zone 2,
Group IIC, or in non-hazardous areas.
Five safety rules for work in or on electrical installations
A set of rules, which are summarized in DIN VDE 0105 as the "five safety rules", are defined
for work in or on electrical installations as a preventative measure against electrical
accidents:
1. Isolate
2. Secure against switching on again
3. Verify that the equipment is not live
4. Ground and short-circuit
5. Erect barriers around or cover adjacent live parts
These five safety rules must be applied in the above order prior to starting work on an
electrical system. After completing the work, proceed in the reverse order.
It is assumed that every electrician is familiar with these rules.
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WARNING
WARNING
WARNING
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ