Answer Posted / kaustav bhadury

Answer 9 is the most comprehensive...
U get loads of standards based on the country u r in..
If in duct-
1) Soik Thermal resistivity : Basically the max temp in the
surrounding. 40*C is the standard.

2) Conductor grouping : Due to arrangement of multiple
conductors there is a development of an EM field which
opposes the flow and thus we need to consider this factor.

3) Temp. Derating Factor : In this the arrangement of cables
in a conduit is of prime importance. It should be in such a
way that all cables have a minimum space to dissipate heat
into the surroundings. The cables can touch each other but
anyone cable should not be fully surrounded by other cables.

4) Burial Depth : Depends on the length below ground where
the conduit is laid.

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