Wiring a light / switch

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Is there any reason why electrician would take the power feed in and out cables to the switch instead of the lamp holder / ceiling rose?

Just noticed when swapping out a faulty switch that this is how our electrician has re-wired our house. He's done a full re-wire with power feed going from switch to switch instead of going from ceiling rose to ceiling rose. There was nothing preventing him going from light to light as it was a full refurb with no plaster, ceilings etc. Makes it a complete pig to swap out a light switch as you have an absolute mess of cables in a very small box.
 
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That is just one method of several which could be used.

It's much easier to do it like that when despicable light fittings from B&Q and the like are selected, as there is only one cable at the light position.

There shouldn't be any issue in changing a light switch provided the cables have been terminated neatly, and they used boxes at least 25mm depth.
For a single switch it should be 3 earth to the metal backbox, 3 neutrals to a separate connector, 2 lines to one switch terminal and the remaining 1 line to the other switch terminal.
 
There's no rules to say which way it can/should be done.

I often loop in the switch, if the customer's lights are anything but standard pendants. The connections on most fancy light fittings are a PITA if you have to loop through them.
 

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