winnie
Senior Member
- Location
- Springfield, MA, USA
- Occupation
- Electric motor research
I don't fully understand table 9, in particular the heading with "ohms to neutral per 1000 feet".
With a three phase three wire circuit I could care less about any neutral, so what exactly is the values in the table?
With any circuit you have the resistance of the conductors going out to the load and the resistance of the conductors coming back.
Sometimes people will write voltage drop equations that include both sides of the drop, in which case you have a _different_ calculation for single phase and 3 phase circuits.
The 'ohms to neutral' just says that it is giving you the resistance of the single wire out to the load. I know that there are formulas to convert this to a 3 phase value, but I find it simpler to just calculate the line to neutral voltage drop versus the line to neutral voltage for 3 phase loads.
-Jon