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Components and protective measures
A number of components and protective measures are prescribed for plant installations. The
types of components and the degree to which the protective measures are mandatory
depend on the IEC regulation that applies to your plant setup.
The following table shows the components of the electrical design with reference to the
previous figure and compares the IEC regulations.
Table 5- 1
Screen
number
①
②
③
Insulation monitoring
Isolation monitoring must be provided in the following cases:
• Design of the communications module with ungrounded reference potential
• If hazardous plant states can be expected as a result of faults.
SIMATIC RF166C
Operating Instructions, 03/2022, C79000-G8976-C578-02
5.2 Operation of the CM on grounded/ungrounded power supply
Components of the electrical design
Components
Disconnecting device for
controller, sensors, and
actuators
Short-circuit and overload
protection
Circuit breaker
IEC 60364
Main switch
Single-pole protection of
circuits.
Protect all power supply
lines with a 24 V DC / 16 A
circuit breaker.
Protection of cables and
lines against overcurrent
Connecting
IEC 60204
Disconnector
Single-pole protection must
be used for a grounded
secondary circuit.
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31
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