Problem 14-5
A farm grain-drying and storage center is supplied
with a 277/480-V, 3-phase system. Two 20-A, 120-V
circuits are required for lights and receptacle outlets.
Determine the minimum kVA rating of the single-phase,
480-V -to- I 20-V step-down transformer.
Solution
Two 20-A circuits are required for a total load requirement
of 40 A at 120 V. The minimum k VA requirement
is determined by using Equation 14.7.