Siemens S7-1500 PROFIBUS Operating Instructions Manual page 24

Installation, wiring, commissioning, operation, disassembly
2.2 Installation, removal and repairs in hazardous areas
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.
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.
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.
Insufficient 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
• Observe the device approvals applicable for your country.
Unauthorized repair of devices in explosion-proof design
Risk of explosion in hazardous areas
• Repair work may only be performed by personnel authorized by Siemens.
24
WARNING
WARNING
WARNING
WARNING
galvanic isolation is performed properly in compliance with local regulations (e.g. IEC
60079-14).
WARNING
Operating Instructions, 01/2023, C79000-G8976-C290-07
SIMATIC CM 1542-5