Assume the following:

(10) 120-volt, incandescent lamp posts @100 watts each', spaced 50' apart.
1,000 ft. conductor length (50 x 10 x 2 conductors)
Total line current 8.33 amps.

The conductors from the panel to the first post will see all 8.33 amps, and each successive segment of conductors will see .83 amps less, correct?
However, each successive segment will see an additional increase in line resistance due to conductor length. ie, the first pole will see more voltage drop due to line current, but less due to the conductor resistance.

There will be more voltage drop at the last post due to conductor length, but it will be somewhat offset by reduced line current, correct?
I may run a multi-wire ckt. to help offset voltage drop, but changing to 240 volt fixtures are out of the question.
Bottom line--- #6, or #4?

Thanks.



[This message has been edited by Redsy (edited 10-29-2005).]