I’m not sure what size the overloads need to be. I was thinking I could just use the HP chart in the code book.
Transformer secondary conductors and feeder taps must have overcurrent protection equal or less than conductor ampacity as a general rule and anything over 800 amps as well. Otherwise nearly all other cases you must have conductor ampacity no less than calculated load (including 125% factor where necessary) but can use next standard higher overcurrent device.
Service factor of motor means nothing to branch circuit and feeder calculations. Usually will make a difference in selecting or setting motor overload protection though. Most motor overload units with a "set the dial" are set up for service factor of 1.15 and all you need to do is set to motor nameplate amps (which is why I also gave motor nameplate amps in the information of the setup) but if you have a motor with a service factor of 1.0 you usually need to multiply motor nameplate amps by .90 and use that value for setting overload. Same usually applies when selecting overload thermal elements from a selection table - use nameplate amps selection table for 1.15 SF but derate nameplate amps by .90 if a 1.0 SF. This information is usually on the selection table for thermal elements or in the instructions for electronic overloads.
No you don't use the book for overloads. That's the difference between FLC and FLA. Think of FLC as being " Full load current in the CODE" and think of FLA and "Full load amps ACTUAL" The overloads are sized on the actual not the code. The wire size and protection is sized on the FLC.
i want to figure out the feeder size and the overload protection. Is there more information needed to finish the problem? My answer was : #4 aluminum on a 90 amp breaker.
You need to know nameplate current rating to determine motor overloads.
