Safety instructions
1.2 PELV
SCALANCE X-300
Operating Instructions, 05/2016, A5E01113043-20
17
Safety notices on use in hazardous areas according to ATEX and IECEx
Requirements for the cabinet/enclosure
To comply with EC Directive 94/9 (ATEX95) or the conditions of IECEx, this enclosure must
meet the requirements of at least IP54 in compliance with EN 60529.
The fiber-optic bus connections labeled SCALANCE MM900 (see type plate) may also be
led through a hazardous area zone1 (see also Auto-Hotspot, section "Explosion Protection
Directive (ATEX)").
Suitable cables for temperatures in excess of 70 °C
If the cable or conduit entry point exceeds 70°C or the branching point of conductors
exceeds 80°C, special precautions must be taken.
If the equipment is operated in an air ambient in excess of 50 °C, only use cables with
admitted maximum operating temperature of at least 80 °C.
Protection against transient voltage surges
Provisions shall be made to prevent the rated voltage from being exceeded by transient
voltage surges of more than 40%. This criterion is fulfilled, if supplies are derived from
SELV (Safety Extra-Low Voltage) only.
Note
Safety extra-low voltage
The supply of the devices by PELV (Protective Extra Low Voltage) according to DIN VDE
0100
-410 or IEC 60364-4-41 is permitted when the generated nominal voltage does not
exceed the voltage limits 25 VAC or 60 VDC.
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