how to choose cable cross section?

because we need to take new cable and we did not  decided to buy which cable we must take?

thanks.

alma i added picture your topic and


and answer of you question is in this link :

Determining conductor cross sectional areas source from schneider

In compliance with the recommendations of IEC 364-4-43, the cross-sectional area of wiring
systems and the protective device must be chosen to meet several conditions necessary for
the security of the installation.
The wiring system must:
- carry the maximum design current and its normal transient peaks
- not generate voltage drops above the allowed values.
The protective device must:
- protect the wiring system against any overcurrents up to the short-circuit current
- ensure the protection of persons against indirect contact.
The logigram in figure 6-1 sums up the principle of the method which may be described by the
following stages:

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