Overcurrent devices must be arranged to isolate a fault with as little disruption of the system as possible. The relationship between the load and the rating or setting of overcurrent devices must meet the following:
(a)The rating or setting of each feeder overcurrent device must be not less than 200 percent of its maximum load.
(b)The rating or setting of a branch circuit overcurrent device must be not more than 25 percent of that of the feeder overcurrent device.
(a)The rating or setting of each feeder overcurrent device must be not less than 200 percent of its maximum load.
(b)The rating or setting of a branch circuit overcurrent device must be not more than 25 percent of that of the feeder overcurrent device.