Final test help!

[topher5657]

I'd like to say hello to everyone and thank you for this site! The information in these forums are beyond helpful. This is my first post and hopefully all goes well.

I was supposed to graduate right at the end of last semester but sadly didn't. I talked to my teacher and he said that I could retake a test and then he could pass me (hence me getting my diploma!). The test is on 3 phase power factor correction and volt drop. I have the power correction down but the volt drop is killing me. Please help!

The volt drop is on 2 wire and 3 wire circuits. Here is a perfect example on what one of the questions would be:


Load "A"-120v/35A. Load "B"-120v/55A. The distance for each load is 115'. Design a 2-wire circuit to supply each load seperately, limiting the volt-drop to 3%. Calculate the voltage at each load and the total power loss in all lines.

Question #2 is the same but it is a 3 wire circuit instead of a 3 wire.

Any help/how to would be great please since I forgot how to do this and misplaced my notes on these questions!


Thanks,

Chris

 

[bob]

Take the information and try to work out the problem and post your results. Then someone will check and tell you if you have it correct. You are solving for the wire size that will handle the amp load in each circuit. Then you will need to verify that the voltage drop is not over 3%.

 

[Smart $]

...Any help/how to would be great please since I forgot how to do this and misplaced my notes on these questions!


Thanks,

Chris

Here's someone else's notes :grin:

http://www.mikeholt.com/technical.php?id=technicalvoltagedrop

 

[resistance]

Take the information and try to work out the problem and post your results. Then someone will check and tell you if you have it correct. You are solving for the wire size that will handle the amp load in each circuit. Then you will need to verify that the voltage drop is not over 3%.

I like this approach!