POWER PE Question For the Week

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So since it's three phase I started with S=VI*sqrt(3).  Then I used the V=IZ relationship to come up with S=(V^2/Z)*sqrt(3), resulting in the wrong answer.  

Can someone explain to me why this is wrong?  I seem to miss a lot of problems because I don't understand why sqrt(3) applies in some cases and not others.

 

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Week 10 Question For The Week can be found at:

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This week's topic is Ladder Logic.

 

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Week 11 Question For The Week can be found at:

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