Question

A commercial facility has a three-phase, 277 volt, 1200 Amp service. What is the required nominal transformer size needed for this building?
a. 750 kVA
b. 500 kVA
c. 575 kVA
d. 633 kVA
e. 1,000 kVA

Answer 1

Answer:

The answer is "Option e".

Explanation:

Given value:

$\to v_{ph}=277 \ \ \ \ \ \ \ I_{ph} =1200$

$vA= v_{Ph} I_{ph} \ \ \ \to for \ single \ phase\\\\=3v_{ph} I_{ph} \ \ \ \ \ \to for \ 3 - \phi \\\\s = 3\times 277 \times 1200$

  $=997.200 \ K VA\\\\= 1000 \ k VA$