Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
WARNING
Unsuitable cables or connectors
Risk of explosion in hazardous areas
• Only use connectors that meet the requirements of the relevant type of protection.
• If necessary, tighten the connector screw connections, device fastening screws, grounding
screws, etc. according to the specied torques.
• Close unused cable openings for electrical connections.
• Check the cables for a tight t after installation.
WARNING
Lack of equipotential bonding
If there is no equipotential bonding in hazardous areas, there is a risk of explosion due to
equalizing current or ignition sparks.
• Ensure that equipotential bonding is available for the device.
WARNING
Unprotected cable ends
There is a risk of explosion due to unprotected cable ends in hazardous areas.
• Protect unused cable ends according to IEC/EN 60079-14.
WARNING
Improper installation of shielded cables
There is a risk of explosion due to equalizing currents between the hazardous area and the non-
hazardous area.
• Ground shielded cables that cross hazardous areas at one end only.
• Lay a potential equalization conductor when grounding at both ends.
WARNING
Insucient isolation of intrinsically safe and non-intrinsically safe circuits
Risk of explosion in hazardous areas
• When connecting intrinsically safe and non-intrinsically safe circuits, ensure that the
galvanic isolation is performed properly in compliance with local regulations (e.g. IEC
60079-14).
• Observe the device approvals applicable for your country.
Connecting up
6.1Safety when connecting up
SCALANCE XR-300
56 Operating Instructions, 03/2023, C79000-G8976-C586-02
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