Transformer sizing for elevator

[JAMAN]

Building has a 208Y/120volt 3-phase service. A 25HP 480volt 3-phase elevator was purchased and is already on the site. The elevator can't obviously be returned, so I need to size a step-up transformer. The elevator specs indicate that on an intermittant bases 29.4HP can be developed at full car capacity for 4 seconds.

Should i base the calc off of the 25HP or 30HP? I was always told to take the worst case scenario, so it would be 30HP. Based on table 430.148, my calcs are as follows:

40amp x 460volt x 1.732 = 31869VA
31869VA x 125% = 39836VA therefore next standard size is 45KVA

Is this calc correct?

 

[JAMAN]

I forgot to ask if LRC needs to be taken into account? For this motor, it would be 102amps.

 

[ron]

Does the elevator have a minimum circuit ampacity?
I might start with that.

 

[JAMAN]

The specs do not state an MCA. It refers you to the NEC for conductor and OPCD sizing.

 

[nakulak]

sounds like that is plenty big, however, why isn't the engineer providiing you with the size for the tranformer ? (someone else screwed up already, tell them to give you the size they want and if its wrong its not on you)