Siemens SITRANS P Compact Operating Instructions page 36

Connecting
5.1 Basic safety instructions
Lack of equipotential bonding
Danger of explosion through compensating currents or ignition currents through lack of
equipotential bonding.
For devices of intrinsic safety "db", "ec", "tb" or "tc" which are operated in a non-intrinsically safe
circuit, observe the following:
• Connect the device to the system via the equipotential bonding terminal.
Note: For devices of the intrinsic safety "ia", "ib" and "ic" type of protection, which are operated
in an intrinsically safe circuit, connection to the system via the equipotential bonding terminal
is not required.
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.
Connecting or disconnecting device in energized state
Risk of explosion in hazardous areas.
• Connect or disconnect devices in hazardous areas only in a de-energized state.
Exceptions:
• Devices having the type of protection "Intrinsic safety Ex i" may also be connected in
Incorrect selection of type of protection
Risk of explosion in hazardous areas.
This device is approved for various types of protection.
1. Select an intrinsic safety type of protection "ia", "ib", "ic" or non-intrinsic safety "db", "tb", "tc",
"ec".
2. Connect the device according to the selected type of protection.
3. When operating with non-intrinsically safe power supplies, make the intrinsically safe types
of protection permanently unrecognizable as in the nameplate example.
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WARNING
WARNING
WARNING
energized state in hazardous areas.
WARNING
Compact Operating Instructions, 01/2021, A5E38874562-AC
SITRANS P320/P420