System manual CECX / Connections and wiring
13.3 General limits for wire cross sections
13.3.1 Minimum cross section according to norm
The minimum cross sections in mechanical engineering are defined in
EN60204 "Electrical and electronic equipment and systems" in chapter
"Conductors, cables, wires" and in chapter 14 "Wiring technology", particu-
larly under "Wiring outside of housings".
Extract from EN60204-1:1997:
"...
13.6 Minimum cross section
To guarantee sufficient mechanical strength, the conductor cross section
should not be smaller than that given in table 6. Wherever it is regarded as
necessary, conductors with smaller cross sections as given in table 6 may
be used in the equipment, under the condition that, sufficient mechanical
strength is achieved in another way and trouble free function is not im-
paired.
Table 6: Minimum cross sections for copper conductors
Description of conductors, cables and lines
Order Application
One core,
multi-core
One core,
solid
Two-core,
shielded
Two-core,
unshielded
Three or more
core, shielded
or not
Outside the
housing
Not flexible,
Main circuit
Connection to ma-
chine parts that are
subject to frequent
movement
Connection in con-
trol circuit
Wiring in data
transmission system
1
1
1
-
1.5
-
1.5
-
0.75
1
0.3
-
0.75
1
0.5
-
0.75
1
0.3
0.08
Inside the
housing
Not flexible,
Main circuit
Connection in con-
trol circuit
Wiring in data
transmission system
0.75
0.2
-
0.75
0.2
-
0.75
0.2
-
0.75
0.2
-
0.75
0.2
0.08
NOTE: all cross sections are listed in mm².
..."
For the minimum cross sections in plant construction, the constructions of
EN50178: "Equipping power plants with electronic apparatus" must be ob-
served.
Further instructions for wiring are stated in EN61131 "Programmable con-
trollers" Part 4 "User guidelines".
CECX-II 13-11
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