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Neutral Voltage Question

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 AJJewsbury over 5 years ago

It also assumes equal conductor size for Line and Neutral

Indeed it does - which might not be a safe assumption since some older 3-phase systems employed a half-sized N. So if you happen to be on the end of an old 3-phase cable where only one phase is significantly used and no parallel paths with N you could see two-thirds of the v.d. along N instead of half - so maybe 24.53V might be closer in some cases.

- Andy.
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0 AJJewsbury over 5 years ago

It also assumes equal conductor size for Line and Neutral

Indeed it does - which might not be a safe assumption since some older 3-phase systems employed a half-sized N. So if you happen to be on the end of an old 3-phase cable where only one phase is significantly used and no parallel paths with N you could see two-thirds of the v.d. along N instead of half - so maybe 24.53V might be closer in some cases.

- Andy.
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Neutral Voltage Question

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