Exam prep unit 8 question

[yired29]

I have a question with unit 8 from the 2008 NEC Exam Preparation by Mike Holt. In unit 8 (8.13) page 233 the question asks to limit the voltage drop for seven light poles. It appears that 3.47 volts are dropped from the panel to light pole #1, this only allows .13 volts to be dropped the rest of the way without exceeding 3% of 120 volts (3.6 volts). When we get to light pole #3 we have dropped a total of 8.93 volts which exceeds the 3% allowed by 5.33 volts. At light poles #5 and 7 there is a voltage drop of 10.33 volts which exceeds the 3% allowed by 6.73 volts. This is a total of 8.6% voltage drop at light poles #5 and 7. I know voltage drop is not enforceable but the NEC recommends limiting voltage drop to a max of 3% on branch circuit or 5% total.

Am I reading this example correctly?

 

[Dennis Alwon]

What is the question asking and what voltage are the lights?

 

[yired29]

Question
Size the conductors to limit the voltage drop for seven light poles. Each luminaire is rated 120V, 2A and the poles are spaced as shown in figure 8-31. View attachment 4164

This is a new drawing but the same layout. All from 2008 edition NEC exam prep book by Mike Holt.

 

[yired29]

When going through the example they use a #10 for all the poles. Just not sure if they are wanting us to understand the effects of voltage drop or if the question was designed to keep the furthest pole from exceeding 3% of 120 volts.