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75 kVA single phase pad mounted transformer
Five to eight houses, a small strip unit, a convenience store. About 34 x 36 x 42 inches and 780 lb, carrying 313 amps on the secondary at 240 volts.
Where this rating fits
Carries the highest single phase search volume of any rating, largely from people trying to work out its amperage. At 120/240 it is 313 amps, not the 90 amps people expect from the three phase figure.
There is also a 75 kVA three phase unit. It is a different machine, not a wiring option. At 75 kVA three phase you get 90 amps at 480Y/277 rather than 313 amps at 240, in a cabinet about 52 x 50 x 55 inches weighing about 1,750 lb.
Common questions
How many amps is a 75 kVA single phase transformer
About 313 amps at 240 volts, and about 625 amps at 120 volts. Single phase current is kVA times 1000 divided by the voltage. There is no square root of three in a single phase calculation, which is the most common mistake people make with this figure.
What are the dimensions of a 75 kVA single phase pad mounted transformer
Around 34 x 36 x 42 inches and about 780 lb. Manufacturers vary, so confirm against the approval drawing before the pad is poured. The pad itself needs to be larger than the cabinet, and clearances in front of the doors are set by the utility.
What is a 75 kVA single phase pad mounted transformer used for
Five to eight houses, a small strip unit, a convenience store. Carries the highest single phase search volume of any rating, largely from people trying to work out its amperage. At 120/240 it is 313 amps, not the 90 amps people expect from the three phase figure.
Dimensions and weights are typical and vary between manufacturers. Confirm against the approval drawing before pouring a pad. Free to cite with a link to this page.