Hod do u calculate cable size for underground laying and
the factors effecting/influencing it??
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Answer Posted / madhav
While other answers are general procedures for selection of
cable, underground cable laying is different, AFTER having
taken the above factors into consideration.
The laying of underground cable should also consider the
permissible conductor temperatures, ambient temperature,
number of cores and mode of laying (single cores or
multicores), etc. The maximum current carrying capacity
also varies with the type of cables and its insulation
properties.
Cable laying is also of several types. In case of single
core cables, they could either be close together or
seperated by one diameter of the cable. That could also
cause differences in current carrying capacities.
In general, for a loaded 5 core cable when laid in ground,
the derating factor could be 0.7 times the rated current
carrying capacity of the cable.
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