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Switched neutral

Harry Macdonald
Looking at the BS7671 AMD2 out for consultation, I noticed clause 463.1.2. This shows an arrangement whereby the control device for a lighting circuit is switched by a switch on the neutral side of the device.

Clearly this works but why would anyone want to do this?
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    Thanks AJJewsbury. I can see that the step relay saves a wire (but adds a relay) but I am not seeing how switching the neutral "saves an extra wire out to the rooms".

    Give that the whole purpose of BS6761 is safety, I would have thought that any practice that reduces safety should be actively discouraged if not forbidden.

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    Thanks AJJewsbury. I can see that the step relay saves a wire (but adds a relay) but I am not seeing how switching the neutral "saves an extra wire out to the rooms".

    Give that the whole purpose of BS6761 is safety, I would have thought that any practice that reduces safety should be actively discouraged if not forbidden.

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