Sealing the housing
DANGER
Explosion hazard
Cable glands ensure sealing between the cables and the housing.
Make sure that strain relief is available for all cables before they are inserted into the housing.
● Only permanently installed cables and lines may be inserted.
● Strain on the CFU cable glands can affect the degree of protection and is not permitted.
The operator must ensure appropriate strain relief.
● Cable glands do not serve as strain relief.
CAUTION
Equipment protection type
The device protection type is only guaranteed if the housing is closed.
● The cover must be mounted; necessary cable glands must be mounted with proper
tightening torque.
● Unused openings for cable glands must be closed.
CAUTION
Seal protection
Contamination or cable residues may lead to malfunctions or short circuits. Before mounting,
check the housing, the seals on the cover, the cable glands, the screw plugs and the pressure
compensation element.
● Ensure that all components are undamaged and clean.
● Ensure that all components are correctly seated before and after mounting.
● Tighten screws and cable glands to the correct tightening torque.
A SIMATIC CFU with aluminum housing contains cable glands. Ensure that the cable glands
fit the cable cross-section.
You can find additional information in the sections "Technical specifications of the SIMATIC
CFU PA with aluminum housing (Page 171)" and "Technical specifications of the SIMATIC
CFU DIQ with aluminum housing (Page 179)".
● For cable inlets with Ex tc protection class, make sure that the seals are approved for the
temperature range used.
● It is possible to install specially certified cable and conductor glands, as well as blanking and
sealing plugs.
Operation planning
4.9 Use in hazardous areas
SIMATIC CFU
32 Commissioning Manual, 08/2019, A5E39252870-AD
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