14. What is the name of the insulating transformer that can be connected as an autotransformer
to raise 208 V up to 230 V?
15. A building is supplied with a 480-V, 3-phase electrical system. The k VA rating of a
single-phase transformer required to supply a 60-A, 3-wire, 120/240-V panelboard is:
a. 10 kVA
b. 15 kVA
c. 20 kVA
d. 37.5 kVA