Posted by MAVERICK Leadership Team on February 13, 2014 @ 2:53 pm
The final installment of a three-part series about time current curves (TCCs) reviews the coordination of sample curves and the importance of coordination.
Continued from Part 2
Now that the basics of TCCs have been explained, a review of coordination is in order. Our sample curves to coordinate will consist of an MCC with main 800-A fuses, a 1,200-A feeder circuit breaker and the switchgear 3,200-A main circuit breaker. In the uncoordinated system there is overlap of the circuit breaker trip curves, and in some instances the main circuit breaker will trip before the feeder circuit breaker. The main fuse in the MCC is also uncoordinated. While the fuse is not required, it is included in this example because it is typical of an industrial installation. The purpose of the f... Continue ReadingContinue ReadingLeave a Comment
VN:F [1.9.22_1171] Tags: