Siemens SITRANS FC430 Operating Instructions Manual page 65

Unsafe extra-low voltage
Risk 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
Risk 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
Risk 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
Risk of explosion through compensating currents between hazardous area and the
non‑hazardous area.
● Shielded cables that cross into hazardous areas should be grounded only at one end.
● If grounding is required at both ends, use an equipotential bonding conductor.
Uncovered non-intrinsically safe circuits
Risk of explosion in hazardous areas or electric shock when working on non-intrinsically safe
circuits.
If intrinsically safe and non-intrinsically safe circuits are operated in an enclosure with the
type of protection "Increased safety Ex e", the connections of the non-intrinsically safe circuits
must be additionally covered.
● Ensure that the cover of the non-intrinsically safe circuits complies with degree of
● Separate connections of the non-intrinsically safe circuits in accordance with IEC/
FC430 (From firmware 4.0)
Operating Instructions, 06/2017, A5E39789392-AA
WARNING
WARNING
WARNING
WARNING
WARNING
protection IP30 or higher according to IEC/EN 60529.
EN 60079-14.
Connecting
5.1 Basic safety notes
65