ELECTRICAL ENGINEERING

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Toros

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Tujunga, CA
Hi, I want to supply 208v,3phase power to the new 30HP elevator per their request . I think I have to provide a 45 kva transformer converting 240v (Available power in the bldg.) to 208v. What type of motors are the elevators...?, do have to consider 140% of name plate current to size the xfrmer and overcurrent protection devise?. Also what size OPD, disconnect sw. and breaker should I use. Please advise....Thank you
 
I would ask them to supply the elevator with the right voltage.

On most of my projects, the elevator people send a form letter with their submittals asking the architect to sign off on the available voltage.

Is the equipment on site already?
 
Edwardtomas said:
Hi, I want to supply 208v,3phase power to the new 30HP elevator per their request . I think I have to provide a 45 kva transformer converting 240v (Available power in the bldg.) to 208v. What type of motors are the elevators...?, do have to consider 140% of name plate current to size the xfrmer and overcurrent protection devise?. Also what size OPD, disconnect sw. and breaker should I use. Please advise....Thank you
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If you are sure it's 208V, 3-phase, buy 3 - 240/120V transformers and bank into DY1. You'll get 208V 3-phase on the wye secondary. On the sizing portion, see if there are additional loads that the owner might throw in, then base your total 3-phase capacity on the total expected load plus some margin that you think is agreeable with the owner.
 
JoeStillman said:
Why wouldn't you?

The elevator guys may not want the transformers in the elevator machine room, but thats the only problem I can think of.
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I thought there was a rule about autotransformers on elevator motors. maybe my rememberer is not functioning correctly. it is not something I deal with.
 
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