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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
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  • 0
    Actually if you have a 3 phase plus neutral supply and  three loads each connected L-N, then the voltage across any one load may be pulled around by the current on the other two either up or down by at most the drop in the neutral wire resistance times the uncancelled fraction of the 3 load currents. But except if there is a high resistance fault in the neutral wiring the voltage seen by any one load is never pulled around by more than a few %, because in a well designed system, the voltage drop in the wires is always supposed to be single figure percents, as dropped voltage is just really lost energy in the wiring, and we'd very much like it to run cool.

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  • 0
    Actually if you have a 3 phase plus neutral supply and  three loads each connected L-N, then the voltage across any one load may be pulled around by the current on the other two either up or down by at most the drop in the neutral wire resistance times the uncancelled fraction of the 3 load currents. But except if there is a high resistance fault in the neutral wiring the voltage seen by any one load is never pulled around by more than a few %, because in a well designed system, the voltage drop in the wires is always supposed to be single figure percents, as dropped voltage is just really lost energy in the wiring, and we'd very much like it to run cool.

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