Thee ampacity of branch circuit conductors and overcurrent protective devices be sized at 125% of the total load.
In some North American countries, ampacity is a portmanteau for ampere capacity as defined by National Electrical Codes. The maximum current, in amperes, that a conductor can carry continuously under normal operating conditions without exceeding its temperature rating is defined as ampacity.
A conductor's ampacity is determined by its ability to dissipate heat without causing damage to the conductor or its insulation. This is determined by the insulation temperature rating, the electrical resistance of the conductor material, the ambient temperature, and the insulated conductor's ability to dissipate heat to the surrounding areas.
All common electrical conductors have some electrical resistance. The flow of electric current through them causes voltage drop and power dissipation, which heats the conductors. Copper or aluminium can conduct a large amount of current without being damaged, but insulation is typically damaged by the resultant heat long before conductor damage occurs.
To learn more about ampacity refer :
https://brainly.com/question/14450805
#SPJ4
