Siemens SIMATIC ET 200eco PN M12-L System Manual page 25

Connecting
4.1 Rules and regulations for operation
External fuses/switches
External fuses and switches must be installed so that they meet the standards for cable and
device protection applicable to your application.
Line voltage
The points to note for line voltage are set out below:
• For stationary plants or systems without an all-pole line disconnector, there must be a
disconnector unit (all-pole) fitted in the building installation.
• For load current supplies, the configured rated voltage range must correspond to the local
line voltage.
• For all power circuits of the ET 200eco PN M12-L distributed I/O system, the
fluctuation/deviation of the line voltage from the rated value must be within the
permitted tolerance.
You can find more information in section Details on insulation, protection class, degree of
protection and rated voltage (Page 75).
24 V supply
The points to note for 24 V power supply are set out below:
• For buildings:
If there is a danger due to overvoltages, you must take lightning protection measures for
external lightning protection (e.g. lighting protection elements).
• For 24 V DC supply lines and signal lines:
In the event of danger through overvoltage, you must provide lightning protection
measures for internal lightning protection (e.g. lightning protection elements). Additional
information can be found in the function manual Designing interference-free controllers
(https://support.industry.siemens.com/cs/ww/en/view/59193566).
• For 24 V DC supply:
Ensure that there is a safe electrical separation of extra-low voltage (SELV/PELV) according
to IEC 61010-2-201 or IEC 60950-1.
Secure all feeding supply voltages with a UL/IEC approved fuse. This fuse must match the
cable cross-section and must not exceed 24 V DC / 12 A.
Note
Wet environment
Other SELV/PELV values apply when using the I/O device in wet environments.
24
Distributed I/O system ET 200eco PN M12-L
System Manual, 06/2021, A5E48753295-AC