Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 21 replies
  • Subscribers 30 subscribers
  • Views 3495 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Neutral Voltage Question

fiftyhertz
Hi all, 


Hoping someone can help with this, as it bothering me that I dont know this. 


This is quite tricky to explain without an image. Essentially, if we have a circuit supplying one luminaire. The line conductor has a voltage of 230v from earth potential supplying the light. To complete the circuit, on the return leg a neutral is required (<50v from earth potential). Where is the point where the neutral is no longer at mains voltage, is it at the neural terminals? 


Is it a case of the luminaire will "use up" the supplied mains voltage? 


Any assistance is appreciated. 


Thanks
Parents
  • 0

    mapj1:

    Welcome to the new place, glad you made it OK :D

    More importantly, did my answer actually make sense?

    3 phase is more complex, as the currents from the three single phases to some degree will cancel, but the concept remains the same.




    Thanks Mike!


    Thanks for the detailed response, so essentially the load resistance is the seperating line between the line voltage and the neutral voltage. Which does make sense as if two common points were measured on either line or neutral it would be 0v (+-1) for volt drop. Is there an instance where the load would not drop all the voltage, and therefore there would be a case where there was a higher voltage on the neutral side - potentially in the three phase case, where there could be large currents in the neutral?


     

Reply
  • 0

    mapj1:

    Welcome to the new place, glad you made it OK :D

    More importantly, did my answer actually make sense?

    3 phase is more complex, as the currents from the three single phases to some degree will cancel, but the concept remains the same.




    Thanks Mike!


    Thanks for the detailed response, so essentially the load resistance is the seperating line between the line voltage and the neutral voltage. Which does make sense as if two common points were measured on either line or neutral it would be 0v (+-1) for volt drop. Is there an instance where the load would not drop all the voltage, and therefore there would be a case where there was a higher voltage on the neutral side - potentially in the three phase case, where there could be large currents in the neutral?


     

Children
No Data

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines