Siemens SIMATIC S7-1500 System Manual page 481

Technical specifications
16.1 Standards and Approvals
Safety information
Personal injury and damage to property may occur
In hazardous areas, injury and damage can occur if you disconnect plug-in connections
during operation of an S7-1500R/H redundant system.
Always switch off the power to the S7-1500R/H redundant system before 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.
Deployment requirements
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.
Safety of the plant or the system
NOTICE
Safety is the responsibility of the assembler
The safety of any plant or system incorporating the equipment is the responsibility of the
assembler of the plant or system.
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. Disconnect
2. Secure to prevent reconnection
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
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF