Feeder tap and voltage drop?

[Isaiah]

Construction ran a feeder, 600V TC cable XHHW-2 3/C #2/0 w/Grd, 550 feet to a junction box where it splits and goes in 2 directions using a larger cable, (that is #4/0’s) for about 125’ in both directions - each terminates at a 3ph 480V heater of about 50A each. How would I calculate the voltage drop for this circuit?


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[ptonsparky]

Use the total current and applied voltage to the junction. Start over with that voltage and use current of each respective load to next point

 

[Isaiah]

Use the total current and applied voltage to the junction. Start over with that voltage and use current of each respective load to next point

Sounds good! Thank you.


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[don_resqcapt19]

There will be an issue with the tap rules unless the 4/0s are outside, except for the connection to the load, and if inside that would have to be "nearest the point of entrance" of the tap conductors.

 

[wwhitney]

There will be an issue with the tap rules

The OP is using "feeder tap" not in the 240.21 sense but in the "tee junction" sense. Two 50A loads on a combination of 2/0 and 4/0.

Cheers, Wayne

 

[Isaiah]

There will be an issue with the tap rules unless the 4/0s are outside, except for the connection to the load, and if inside that would have to be "nearest the point of entrance" of the tap conductors.

Don everything is outside


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[Isaiah]

The OP is using "feeder tap" not in the 240.21 sense but in the "tee junction" sense. Two 50A loads on a combination of 2/0 and 4/0.

Cheers, Wayne

Yes it would be better described as a T


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