lighting load please help

[Matt Mckenzie]

If you have a 400kw 277v lighting load operating at continuous duty what is the minimum over current device that can be used? 400,000 va x 125% = 500,000va/(480x1.732)= 601.4 amps. Minimum size OCP 700amps correct?

 

[ron]

If the power factor is 1 (making kW = k VA), then any breaker bigger than 601A.

In reality, the power factor will be less than 1, so the calculation will change.