Fault Current/ Breaker Operation

[Gshell82]

In the pic below... If there is a fault where shown, will the indicated downstream breakers open?

Thanks




Pic: https://imgur.com/a/lc7gyn8

 

[jumper]

No. Those downstream breakers will not open a fault with the service entrance conductors.

Those wires are protected by the utility OCPD. A line fuse or something else upstream.

 

[don_resqcapt19]

Those breakers will not open as they will not see the fault current. Typically a fault at that location will not open any overcurrent device and will "burn" open after some time.

 

[al hildenbrand]

The fault current will return to the Source which is above the top of your schematic. The Circuit Breakers you have indicated won't "see" the fault current.