Calculating Cable Loss

Yep, someone wrote the question down incorrectly.

-- Sue

Try Neher-McGrath for an engineer's analysis. For simple resistance use NEC Chapt 9 Table 8 resistances and P=3DI*I*R for single phase. The NM paper and other papers can be downloaded in PDF format from:

This appears to be a homework problem of the most elementary kind. If you cannot solve it based upon the book and the instructor, think of a different line of study.

The only hint I will throw out is that maybe you do not know the definition of a cable bvs a conductor. Your description of the problem is not stated well.

Bill

The answer given is bullshit. Go back and check the data,. R per phase =0.000017*30=5.1*10^-4 ohms At 25,88 A (such meaningless accuracy) the loss is 0.34 watts per phase for 3 phases, (balanced so 4th conductor ahs 0 current) the total loss is 1 watt.

Try thinking- it helps.

Oops! I was using the wrong voltage to calculate it. I thought this cable was located on the high side of the breaker, is was accurately on the low side.

Thanks for you help.