Hello again everyone. I need help with this dryer calculation on my practice test. Here it is.

An eight unit apartement complex is served by a 120/208 volt 3 phase 4 wire system. Each apartment has a 4.5 kw single phase 120/208 volt dryer. What would be the minimum service demand for these dryers?

a. 40kw

b. 36kw

c. 27 kw

d. 21 kw.

The practice test says the correct answer is 27kw but I cant figure it out. This is what I can do so far. I turn to article 220.54 and use a rating of 5000 watts per unit per 200.54.

8 dryers x 5000 watts = 40,000.

I then go to table 220.54 and see that 8 dryers use a demand factor of 60%. I then do

40,000 x 60% =24,000.

That's as far as I can get. Can anyone help me please?

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