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Voltage drop on a shower causing a light to come on

Sam Ayre

Hi everyone I was hoping someone might be able to help I came across a video on YouTube where when the shower was turned on it caused the bathroom light to glow while the switch was turned off. The person later explained it to be a voltage drop on the shower but to my understanding something like that wouldn't have that kind of effect ant guidance would be great thank you. 

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    From what your saying does that mean that when the voltage decreases on the line said it'll cause an increase on the neutral conductor? 

    Indeed. Say we had 230V at the supply and due to voltage drop we had 220V at the load - presuming equal impedance on the L & N conductors -  you'd loose 5V along L and 5V along N - so relative to the supply N (or Earth) - you'd see 225V at the load L and 5V at the load N. The load sees the difference between 5V and 225V.

    (At least that's true for simple single phase systems - where 3-phase distribution is involved return currents can cancel out to a lesser or greater extent, so the voltage drop along N can be lower than L).

       - Andy.

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  • 0

    From what your saying does that mean that when the voltage decreases on the line said it'll cause an increase on the neutral conductor? 

    Indeed. Say we had 230V at the supply and due to voltage drop we had 220V at the load - presuming equal impedance on the L & N conductors -  you'd loose 5V along L and 5V along N - so relative to the supply N (or Earth) - you'd see 225V at the load L and 5V at the load N. The load sees the difference between 5V and 225V.

    (At least that's true for simple single phase systems - where 3-phase distribution is involved return currents can cancel out to a lesser or greater extent, so the voltage drop along N can be lower than L).

       - Andy.

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