Overhead Cable

Status
Not open for further replies.
M

monitaverma

Member
I am working with contactor in designing overhead cables for a job.
Distance for run = 600 ft. Total Load: 200 Amps, 480V, 3 phase. He mentioned that he wants to use #2 aluminium triplex cable for the run.

My questions are:

1. Does triplexed includes 3 phase wires and neutral?

2. How to calculate voltage drop?

3. How many sets of cables do I need to run?

4. How should I calculate the distance between power poles?

Any guidance will be appreciated.
 
monitaverma said:
I am working with contactor in designing overhead cables for a job.
Distance for run = 600 ft. Total Load: 200 Amps, 480V, 3 phase. He mentioned that he wants to use #2 aluminium triplex cable for the run.

My questions are:

1. Does triplexed includes 3 phase wires and neutral?

2. How to calculate voltage drop?

3. How many sets of cables do I need to run?

4. How should I calculate the distance between power poles?

Any guidance will be appreciated.
Click to expand...

Mmmmmmmmmm, I have seen and worked for low voltage overhead distribution but it was 2 set of three phase conductor plus one neutral. Since it was low voltage distribution.
1- You design for low voltage overhead distribution there should be neutral .
2-Same as low voltage underground distribution but Voltage drop has only one formula worldside just take consideration of length, impedance and amount of ampere per phase.
3- I have seen two sets.
4- You should check the cable data for maximum expand and sag calculation

Ok I will see to give you reference book.
 
To calculate the voltage drop you use table 9 in the back of the NEC. As for triplex cables look at Figure 310.60, detail 7 in the 2008 NEC. Look's like they're just three cables.
 
Status
Not open for further replies.
Top