Switchboard 'MA' (4,000A, 480Y/277V) has a 800A LSIG breaker, this breaker feeds ATS-1.
ATS-1 feeds panel 'B' (800A MLO, 480Y/277V).
Panel 'B' has a 300A branch breaker which feeds motor control center 'C'.
The elevator was fed out of motor control center 'C' via a fused disconnect switch and starter (fuse size couldn't be identified, but disconnect size was 30A).
When the elevator starts and fails, 800A CB in switchboard 'MA' was tripped but not 300A CB in panel 'B' or neither fused disconnect that feeds the elevator.
Do you think this is a coordination study problem or something else? I couldn't understand...
ATS-1 feeds panel 'B' (800A MLO, 480Y/277V).
Panel 'B' has a 300A branch breaker which feeds motor control center 'C'.
The elevator was fed out of motor control center 'C' via a fused disconnect switch and starter (fuse size couldn't be identified, but disconnect size was 30A).
When the elevator starts and fails, 800A CB in switchboard 'MA' was tripped but not 300A CB in panel 'B' or neither fused disconnect that feeds the elevator.
Do you think this is a coordination study problem or something else? I couldn't understand...