Siemens SITRANS P DS III Operating Instructions Manual page 64

Connecting up
5.1 Basic safety instructions
Unsafe extra-low voltage
Danger of explosion in hazardous areas due to voltage flashover.
• Connect the device to an extra-low voltage with safe isolation (SELV).
Lack of equipotential bonding
Danger of explosion through compensating currents or ignition currents through lack of
equipotential bonding.
• Ensure that the device is potentially equalized.
Exception: It may be permissible to omit connection of the equipotential bonding for devices
with type of protection "Intrinsic safety Ex i".
Unprotected cable ends
Danger of explosion through unprotected cable ends in hazardous areas.
• Protect unused cable ends in accordance with IEC/EN 60079-14.
Improper laying of shielded cables
Danger of explosion through compensating currents between hazardous area and the non-
hazardous area.
• Only ground shielded cables that run into the hazardous area at one end.
• If grounding is required at both ends, use an equipotential bonding conductor.
Connecting device in energized state
Danger of explosion in hazardous areas.
• Connect devices in hazardous areas only in a de-energized state.
Exceptions:
• Circuits of limited energy may also be connected in the energized state in hazardous
• Exceptions for type of protection "Non-sparking nA" (Zone 2) are regulated in the
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WARNING
WARNING
WARNING
WARNING
WARNING
areas.
relevant certificate
SITRANS P DS III with PROFIBUS PA
Operating Instructions, 06/2013, A5E00053276-07