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The following factors should be taken into account while selection, the correct size and type of cables.

1. system voltage : what is the system voltage and the type of system ? Single phase, three phase, earthed or unearthed or dc ?
2. current carrying capacity : the current rating is the main and basic criterion. Tables nos. 1-22 give the carrying capacity of various type and size of cables, under different condition of laying . these should be considered before the correct size and type of cables is decided upon. Suitable derating/uprating factor should be used depending on the conditions of laying as under :
2.1 : depth of laying.
2.2 : ambient temperature of ground or air.
2.3 : soil resistivity.
2.4 : whether one or more groups of cables are laid together.
2.5 : any heating source near cable run.