Use In Hazardous Areas - Siemens Simatic CFU Commissioning Manual

Operation planning

5.4 Use in hazardous areas

5.4 Use in hazardous areas
Hazardous areas are classified into zones. The zones are distinguished according to the
probability of the existence of an explosive atmosphere.
Open equipment
The CFU is open equipment. This means that it may only be installed in enclosures, cabinets
or in electrical equipment rooms. These may only be accessible via keys or a tool. The
enclosures, cabinets or electrical equipment rooms may only be accessed by instructed or
approved personnel.
Properties of zones
You will find an overview of the zone divisions in the following table:
Table 5-1
Areas
Zone 2
Zone 22
Use the CFU only with approved enclosure
1)
For additional information, refer to the Fundamentals of Explosion Protection
support.industry.siemens.com/cs/ww/en/view/12521844) system manual.
Component areas
Use in hazardous area of zone 2 /22
● The CFU PA can be used as a bus node in device category 3G in the hazardous area of
● The CFU PA bundle with aluminum enclosure can be used as a bus node in the device
Only intrinsically safe electrical field devices of device category 3G and 3D for zones 2 and
22 may be connected to the spur lines FB0 to FB7.
Read the information on approval in the product information.
The following can be used in zone 2/22 hazardous areas:
● SIMATIC CFU PA bundle with aluminum enclosure
● PROFINET cables to the CFU
● The cables to PROFIBUS PA field devices, sensors and actuators
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WARNING
Classification of zones - hazardous areas
Explosion hazard
Rare or short-term presence of potentially explosive gas atmosphere
Rare or short-term presence of potentially explosive dust atmosphere
1)
CAUTION
zone 2.
categories 3D and 3G in the hazardous area of zones 2 and 22.
Commissioning Manual, 07/2018, A5E39252870-AC
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SIMATIC CFU