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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.
3. MODE OF INSTALLATION : The mode of installation determines the type of cable to be used. Electricity regulators require the use of armoured cables for underground applications. In general, armoured cables are recommended where there is any chance of mechanical damage. If subsequent mechanical damage after laying cables is not likely, cheaper, unarmoured cables can be used.