Answer / a.sripathi reddy

In addition to above answer,Cable rating /size selection
based on 1.voltage drop 2.Voltage level 3.Cost

Answer / santosh

Cable Sizing to be selected based upon many factors, some of
these are:
1. Total connected load to be considered with 25% spare
and maximum demand current in AMPS to be calculated. This
will be maximum ampacity.
2. Derating factors such as length of cable to be laid,
Type of installation of cable in medium ( In air, Duct,
Directly buried in earth).
3. Thermal resisivity of soil at 2.5 deg C/m, correction
factor for cables, no of cables laid.

Answer / murad

cables are used for carrying power to desired
destinations.manufacturers of cables provide apmere rating
tolerance for each cable with their booklet.for someone's
use one should follow the tables and desired amperer and
corresponding cable.

Answer / ritesh khimani

in addition to above answer i think distance upto which
cable has to csrry the power and also atmospheric condition
of the site at where the cable will be installed is also a
very important factor.

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