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For Power :-
1- Study the type of load ( 3ph or 1 ph), voltage supply , the tempereature ( Air , soil , ground ) , the type and the desired installation type ( Tray , conduit , trench...) .
2- measure the distance between the source and the machine or desired device .
3- using calculation formulas tables or computer-assisted program to find permitted voltage drop and cable size .
4- compare the characteristics of the of the calculated table with the desired .
5- consider the country regulation , safety and international codes wiring , insulation and termination .
For control wiring :-
1- Study the available space inside the electrical machine box ..
2- Read the characteristics of the device itself..
3- Use the recommended cables suggest by the vendor , if not find the rang of amp and choose the corresponding size for it .
It can be don through condiuting, and undergroun wiring
