I am having to add a transformer to a piece of equipment. The transformer is 3KVA, and will take 575V down to 230V. I will be powering three 1HP motors on the secondary. When I size the disconnect for the equipment, which also includes heater loads and compressors, should I use the FLA of the transformer primary (3000/575) or should I use the actual FLA's of the motors?
By the way, the motors fed by this transformer are all 1HP, and are not the largest motor inside the equipment.
If I used the Amp load of the motors on the transformer secondary, would I have to use the same ratio of 575/230 to calculate the amps being drawn on the primary? The amps would be reduced by that ratio going from secondary to primary.
By the way, the motors fed by this transformer are all 1HP, and are not the largest motor inside the equipment.
If I used the Amp load of the motors on the transformer secondary, would I have to use the same ratio of 575/230 to calculate the amps being drawn on the primary? The amps would be reduced by that ratio going from secondary to primary.