Vr_ecobox

im in school right now and stuck on a project due later today and i need some help. here is the problem:

calculate the minimum transformer size for the loads as listed. Include the lighting based on the VA/sq ft of the type of occupancy, add 25% of the largest motor to the load and calculate all receptacle circuits at the amperage listed. Use any applicable lighting and receptacle demand factors in your calculations. If a second transformer is required to serve the single phase loads size the transformer KVA and add the primary amps of that transformer as a load on the 3 phase supply. Create a panel schedule that will list the number of circuits required to serve both the singe phase and 3 phase loads you have calculated, and how they will be connected to the 3 phase lines to balance the load. List the maximum line amps for each line of the 3 phase system will all loads connected at full calculated load.


Factory
208 Y 120 transformer
144 ft. x 100 ft.

3 phase loads:
5-5 hp motors
6-15 hp motors
2-40 hp motors

1 phase loads:
80-120 volt general use receptacles
2-120 volt microwave circuits 20 amps
5-120 volt 8 amp grinders
2-208 volt 4.5 kw water heaters
lighting at 120 volts

any help would be greatly appreciated. im completely stuck!

brian john

All this information is readily available in the NEC look at proper section, I assume your teacher has instructed you in the use of this book and the pertinent sections also look at samples in the back.