II - DCE FEL ČVUT v Praze

1.7.4 Selecting Cables and Lines in Accordance with DIN VDE 0165
I/O Modules with Intrinsically-Safe Signals
C79000-G7076-C152-04
In compliance with ElexV, cables and lines laid in hazardous areas do not
require a test certificate. All types which are suitable for the specific purpose
may be used if they comply with the standards stipulated in DIN VDE 0165,
Item 5.6. The electrical characteristic data (e.g. capacitance 200 nF/km,
inductance 1 mH/km) must be specified for cables used in intrinsically safe
measurement and control circuits.
The following applies within a group cable:
The insulation between lines of intrinsically safe and non-intrinsically safe
circuits must withstand an alternating voltage of 2U + 1000 V, but at least
1500 V, where U is the sum of rms voltage values of the intrinsically safe and
non-intrinsically safe circuits.
Table 1-2 Minimum cross sections of copper conductors in accordance with DIN VDE 0165
Cable type Number of
cores
Power cables and lines in
accordance with DIN VDE
0298, Part 1, 3
Wiring cables and lines in
accordance with DIN VDE
0891, Parts 1, 5, 6 for voltages
< 60 V AC or
< 120 V DC
Mechanical Configuration of an Automation System with SIMATIC S7 Ex Modules
1
2 - 5
> 5
Flexible
stranded
conductor
mm 2
1
0.75
0.5
Solid
conductor
mm 2
1.5
1.5
1
Conductor
diameter mm
> 1 0.5 0.5 0.8
2
> 2
2 (shielded)
0.5
0.28
0.28
0.5
0.28
0.28
-
0.8
0.6
0.6
1-21