Duct sizing formula for cable ducts?

A duct is a contraption used to transfer something from one locale to another. In fireplaces, the chimney is a duct that leads the smoke from inside the house into the air outside.

Is a contraption that transfers something, usually air, from one locale to another.duct is made from PVC, used in the control boxes and machines like this, you can get more information about this...

a pipe ,tube ,channel for conveying gas.

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If you lay a power cable in a duct, and it overheats due to a short or overload, the smoke from the cable burning will fill the duct and be transported by the duct to places it should not be. If the...