Current carrying capacity depends on the cross-sectional area of the conductor and the material it is made from. The complexity of cable routes and environmental constraints such as burial depth, type of soil will also influence the current rating. It is often referred to as “derating factor”. Therefore engineers and designers, when calculating power load distribution and voltage drop, will have to consider all of these scenarios, and much more, in order to what we in the industry refer to as “sizing the cable” to compensate for the “derating factor”. That is why there is no one size fits all situation.
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