Recently we had a study done and adjustments were recommended for both arc flash reduction and coordination in the report.
Can adjustments be made to breaker trip settings while energized? Our electrician says yes, he has down it on instantaneous but I am unsure on the other settings recommended...
I understand that switchboards are built to have a withstand time rating of 3 cycles. Now that is at the rating of the switchboard, for example 100kA. I am struggling with a coordination issue where I can turn off the instantaneous setting of the main breaker (SQD Masterpact NW40H3, Micrologic...
Thank you. I asked the electrician and he said there is a ground as the secondary service is 480 and 277 volts. He looked at me funny like it was obvious. I'm learning!
Thank you vandal06. So if I understand you properly, for any ground fault above 640 amps, the circuit breakers will trip prior to the main breaker. Would this be similiar to having 3 fuses and one fuse will blow due to fault on that wire? In other words, the circuit breaker will trip all...
Hello,
First off I apologize if the answer to this question is obvious but I am not an electrical engineer and have been having a discussion on this situation with my plant electrician. Recently corporate people had a study done on the facility I work at and produced some time current curves...
