K-Patents PR-23 - Manual (Page 142)

134 PR-23 instruction manual
Figure 9.39 Intrinsically safe wiring, PR-23-...-IF
Notes:
In the United States, installation must be in accordance with the applicable require-
ments of ANSI/ISA RP12.6 and the national electrical code (ANSI/NFPA 70). In
Canada installation must be in accordance with the applicable requirements of Cana-
dian electrical code part I C22.2.1 section 18 and appendix F. Associated Apparatus
manufacturer’s installation drawing shall be followed when installing this equipment.
Ex ia is defined as Intrinsically Safe. The intrinsic safety concept allows the intercon-
nection of two intrinsically safe devices. FM approved and CSA certified entity para-
meters are not specifically examined in combination as a system when:
Uo or Voc or Vt <= Vmax,
Io or Isc or It <= Imax
Ca or Co >= Ci + Ccable or
La or Lo >= Li + Lcable, Po < Pi.
Control equipment connected to the Associated Apparatus shall not use or generate
more than 250 Vrms or Vdc. Important: Use supply wires suitable for 5 K above
surrounding environment.
For Division 1 installations, the configuration of Associated Apparatus shall be FM
Approved/CSA Certified under Entity Concept.