Point By Point Fault Current for Branch Circuits

[AWinston]

I am reviewing the design of a 17 unit apartment building. The power company contributes 22,000A of fault current at 120/240V single phase. In the plan review, the city said to "complete a point-by-point fault current calculation; start the fault current calculations at the point of connection at the service of the customer's facility". Is this necessary as there are no major loads like commercial projects. Do I need to calculate the fault current of every single branch circuit in the building?

 

[Fitzdrew516]

I am reviewing the design of a 17 unit apartment building. The power company contributes 22,000A of fault current at 120/240V single phase. In the plan review, the city said to "complete a point-by-point fault current calculation; start the fault current calculations at the point of connection at the service of the customer's facility". Is this necessary as there are no major loads like commercial projects. Do I need to calculate the fault current of every single branch circuit in the building?

They just want the available fault current at each unit's panelboard.

 

[Fitzdrew516]

See attached - As previously discussed on the other thread, use 240V not 120V. Also... the distance in this formula is the actual distance. So if the unit is 100ft. away insert 100ft. in that cell. One more thing... again, change the extension from .xls to .xlsx.

- Drew