Siemens SIMATIC S7-300 Manual page 531

Special Conditions for KEMA 05 ATEX 1137X
1. Subassemblies/modules must be installed in an adequate housing. This must
comply with the IP 54 degree of protection (according to EN 60529) as a
minimum. The environmental conditions under which the equipment is installed
must be taken into account. There must be a manufacturer's declaration for
zone 2 available for the housing (in accordance with EN 60079-15).
2. If a temperature of > 70 °C is reached in the cable or at the cable entry of this
housing under operating conditions, or if a temperature of > 80 °C can be
reached at the junction of the conductors under operating conditions, the
temperature-related properties of the cables must correspond to the
temperatures actually measured.
3. Steps must be taken to ensure that the rated voltage through transients cannot
be exceeded by more than 40 %.
Further Information
You can find further information on devices/modules in the associated handbook.
Product Information on the Use of subassemblies/modules in a Zone 2 Hazardous Area
A5E00352937-03
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