Intrinsically Safe Wiring (Fm/Csa); Fisco Concept - Siemens SITRANS L Operating Instructions Manual

Connecting
5.3 Wiring setups for hazardous area installation
5.3.2.1

Intrinsically safe wiring (FM/CSA)

Device nameplate (FM/CSA)
①
The FM/CSA Intrinsically Safe connection drawing A5E02358161 can be downloaded from
the Siemens Industry Image Database:
SITRANS LR250 Foundation Fieldbus connection drawing (A5E02358161)
(http://www.automation.siemens.com/bilddb/index.aspx?gridview=view2&objkey=G_FI01_X
X_11098&showdetail=true&view=Search)
• For wiring requirements: follow local regulations.
• Approved dust-tight and water-tight conduit seals are required for outdoor Type 4X / 6,
IP67, IP68 locations.
• Refer to Instructions specific to hazardous area installations (Page 44).
Entity concept:
The Entity Concept allows interconnection of intrinsically safe apparatus to associated
apparatus not specifically examined in such combination. The criteria for interconnection is
that the voltage and current which intrinsically safe apparatus can receive and remain
intrinsically safe, considering faults, must be equal to or greater than the output voltage (Uo)
and output current (Io) levels which can be delivered by the associated apparatus,
considering faults and applicable factors. In addition, the maximum unprotected capacitance
(Ci) and Inductance (Li) of the intrinsically safe apparatus, including interconnecting wiring,
must be equal to or less than the capacitance and inductance which can be safely connected
to associated apparatus.
5.3.2.2

FISCO concept

FISCO Concept
Note
Connection drawing
For complete details and instructions regarding the FISCO Concept, see the FM/CSA
connection drawing which can be downloaded from the Siemens Industry Image Database:
SITRANS LR250 Foundation Fieldbus connection drawing (A5E02358161)
(http://www.automation.siemens.com/bilddb/index.aspx?gridview=view2&objkey=G_FI01_X
X_11098&showdetail=true&view=Search)
42
Connection drawing number
SITRANS LR250 with FOUNDATION FIELDBUS
Operating Instructions, 09/2021, A5E32221411-AH