PR electronics 9107 Manuel De Produit page 31

9107QU01
LERBAKKEN 10, 8410 RØNDE DENMARK
capacitance, Ca (or Co), shown on any associated apparatus used. The same applies for inductance
(Lcable, Li and La or Lo, respectively). Where the cable capacitance and inductance per foot are not known,
the following values shall be used: Ccable = 60 pF/ft., Lcable = 0.2 μH/ft.
Where multiple circuits extend from the same piece of associated apparatus, they must be installed in
separate cables or in one cable having suitable insulation. Refer to Article 504.30(B) of the National
Electrical Code (ANSI/NFPA 70) and Instrument Society of America Recommended Practice ISA
RP12.06 for installing intrinsically safe equipment.
Intrinsically safe circuits must be wired and separated in accordance with Article 504.20 of the
National Electrical Code (ANSI/NFPA 70) or other local codes, as applicable.
The module has not been evaluated for use in combination with another associated apparatus.
For installations in which both the Ci and Li of the intrinsically safe apparatus exceeds 1% of the
Ca (or Co) and La (or Lo) parameters of the associated apparatus (excluding the cable), then 50% of Ca
(or Co) and La (or Lo) parameters are applicable and shall not be exceeded. The reduced capacitance shall
not be greater than 1 μF for Groups C and/or D, and 600 nF for Groups A and B. The values of Ca (or Co)
and La (or Lo) determined by this method shall not be exceeded by the sum of all of Ci plus cable
capacitances and the sum of all of the Li plus cable inductances in the circuit respectively.
Revision date: Version Revision Prepared by: Page:
2019-11-26 V1 R0 PB 3/5
9107 - Version de produit 9107-002 31