Question on panel with mainly motor loads

[KWH]

I have motors that total up to about 150 amps and was wanting to install a 225amp main breaker panel in a 480v system, will this main breaker sizing work considering the branch breakers are sized at 2.5. They will all run at the same time but not start at the same time.

 

[Dale001289]

I have motors that total up to about 150 amps and was wanting to install a 225amp main breaker panel in a 480v system, will this main breaker sizing work considering the branch breakers are sized at 2.5. They will all run at the same time but not start at the same time.

Don't see a coordination issue assuming all branch CB's are less ampacity than the MCB. Should be ok.

 

[Jraef]

I have motors that total up to about 150 amps and was wanting to install a 225amp main breaker panel in a 480v system, will this main breaker sizing work considering the branch breakers are sized at 2.5. They will all run at the same time but not start at the same time.

From your description is appears that each individual motor circuit has it's own Branch Circuit Protective Device. So really the only thing you must adhere to is the conductor sizing per 430.24, then your breaker for the entire thing would be sized to protect those conductors as per 430.62 (B). I doubt that no matter how you apply 430.24, you are not going to exceed 225A, so if your conductors feeding the multiple motor circuits are rated for 225A or more, you can use a 225A breaker.