Cable Sizing

[Moses Njuguna]

Pls assist in determining cable size (pvc armoured 4-core) for;
1. 400kw/415v panel distance from mains power panel -100mts
2. 120kw/415v panel distance from mains power panel-120mts

[darkwood]

Its like asking you to book me an holiday that i will like their are so many parameters you need to know before i could possibly tell you:-
Ambient temp'

installation methods

Characteristics of load (Is it large inductive)

Is the Kw value you give balanced over 3 phase or per phase

These are just a few things to address but the list goes on prob best getting someone on site to assess as this size load may need parallel supplies per panel.

[Besoeker]

Its like asking you to book me an holiday that i will like their are so many parameters you need to know before i could possibly tell you:-
Ambient temp'

installation methods

Characteristics of load (Is it large inductive)

Is the Kw value you give balanced over 3 phase or per phase

Location, applicable standards, local regulations, etc.
In any case, this particular forum is to quote "For electricians and those already in the electrical industry. "
I would expect an electrician to have access to and be able to consult the appropriate tables in BS7671 or whatever equivalent standard is applicable.