Been putting together a voltage drop calculation spreadsheet based on the NEC tables and noticed something surprising. I though that the voltage drop in a circuit would always increase with decreasing power factor. That tends to be the case with larger wire sizes (3/0 and above) but is definitely not the case with smaller wires. These calculations were based on Chapter 9 Table 9, I could show my work if you want but taking the following parameters, the voltage drop is worst with unity pF:

A=50A

wire size=8awg

length=50

voltage=120

phase=1

Here are the percent voltage drops I got starting with pf=1, then .9, .8, .7, .6 ,......,.2

pf=1 - 3.24%

3.04%

2.76%

2.47%

2.17%

1.86%

1.55%

1.23%

pf=0.2 - 0.92%

This happens for all the wires up to 2/0. What gives? Is it just due to the impedances of smaller wires?

A=50A

wire size=8awg

length=50

voltage=120

phase=1

Here are the percent voltage drops I got starting with pf=1, then .9, .8, .7, .6 ,......,.2

pf=1 - 3.24%

3.04%

2.76%

2.47%

2.17%

1.86%

1.55%

1.23%

pf=0.2 - 0.92%

This happens for all the wires up to 2/0. What gives? Is it just due to the impedances of smaller wires?

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