Cable Impedance at voltages other than 600V

Status
Not open for further replies.
E

Electriman

Senior Member
Location
TX
Greetings,

I am trying to calculate the voltage drop for 5 kv and 15 kv cables. But unfortunately, NEC only shows the impedances for 600 v cables. What about other voltages? What is the impedance value for 5 kv and 15 kv cables?
I know that the voltage drop is not a concern for major electrical equipment but I still have too calculate it.

Thanks,
 
The absolute voltage drop depends on wire size and load current independent of operating voltage.
Once you have the drop in volts you can use the working voltage to find the percent drop.

Sent from my XT1585 using Tapatalk
 
mbrooke said:
In long runs it does add up. Sheath currents are energy that is not going to the load.
Click to expand...
But unless they increase the measurable current in the central conductor they cannot cause voltage drop.
I can see that the source current could be greater than the load current and you have to allow for that.
If the transmission line characteristic impedance is significant compared to the load impedance, that would affect voltage drop too. Not an issue with DC.

Sent from my XT1585 using Tapatalk
 
As long as you have the layout and cable cross section details, you can always calculate it, its tedious but can be calculated.


Sent from my iPad using Tapatalk
 
Status
Not open for further replies.
Top