i just want to select the power cable but i m having some confusion that when we select single core power cable we take current rating of that conductor but if we say 3-core cable has 200A capacity then it means that each core has this capacity or it is the the capacity of overall 3-cores
Current ratings for conductors are based on several factors including conductor type (Copper, Aluminum, other), insulation material (thermoplastic, rubber, asbestos composition), ambient temperature, length, exposure to weather, and numerous other factors stipulated by the NEC or local Code. The ratings are usually given for a single conductor in free air. Mulitiple current carrying conductors which share a conduit, raceway, or any other enclosure must be derated appropriately. See the source below for Code reference and rules of thumb.
