
B-63943EN/02 3.INSTALLATION
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Table 3.5.2 Guideline for selecting the cross-sectional area of the
protection copper cable
Rated current of the fuse for protecting
an assumed circuit or the rated current of
the overcurrent protection unit
A
Cross-sectional area of the
protection copper cable
mm
2
30 2 or more
50 3.5 or more
100 5.5 or more
150 8 or more
225 14 or more
400 22 or more
600 38 or more
800 50 or more
1000 60 or more
1200 80 or more
1600 100 or more
2000 125 or more
2500 150 or more
3200 200 or more
4000 250 or more
Rated current of the fuse for protecting an assumed circuit or the rated
current of the overcurrent protection unit
When the breaker limits a current, the cable only needs to satisfy the
requirement of current-carrying capacity of the breaker.
Connections made with welding can also be used when they allow a
sufficient current to flow.
* A ground wire for protective grounding must satisfy the
following conditions, as defined in IEC60204.
• Where the cross section of a wire of the connected input
power supply is S:
S ≤ 16 mm
2
...S
16 mm
2
< S ≤ 35 mm
2
...16 mm
2
35 mm
2
< S ..S / 2