I need to install a transformer for a 50 amp receptacle. Here are the details: I want to install a 50 amp 3 phase 480 volt receptacle. I have 3 phase 208 volt available on the line side. I believe the calculation for KVA would be (480x50x1.732)/1000 = 41 KVA so I would select a 45 KVA transformer. If this is correct, how would I size the primary feed from the 208 volt panel to the transformer?
Transformer Calculation
- Thread starter mgtack
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kwired
Electron manager
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- NE Nebraska
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- EC
In a similar manner, 41 kVA x 1000/ 1.732/208 = 114 amps of primary current is necessary.
Next thing is what is actual load to be connected to this 50 amp receptacle? If supplying a single outlet you would only need necessary capacity for the supplied load. Say you only have a load of 34 amps. That means you only have about 28kVA of load. You may possibly only use a 30 kVA transformer to supply this load.
That was exactly what I was looking for, thank you. Yes, they are changing the requirements daily, now they want to add an additional 480 volt 20 amp receptacle. I will have to install a 100 panel on the load side of the transformer incase they have additional needs. Thanks for you help.
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