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?
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?