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So I was doing some work at my sisters house and one of the jobs she wanted was her lights looking at, i looked at them and quite honestly thought if I start touching these i'm going to end up rewiring the lighting circuit. I'm newly qualified and happy to put my hands up if something is looking like I may be out of my depth but basically, you had light switches in the kitchen turning the living room lights on, when you turn a different light on in the kitchen then one of the two kitchen light fittings would dim and a separate light would turn off it was just all over the place.

Long story short I said to get a more experienced sparks round to have a look but if she could let me know what the issue was I'd be interested in knowing, she came back to me today and said that he said it was what is known as Octupus wiring and is his pet hate and was a common way of doing things back around the 60's.

Could someone just explain a bit more what octopus wiring actually is and any pro's con's?

Many thanks
 
Yes, that's genuine 'Octopus', the trade marked wiring system, although the term is also used generically to mean one big junction box with a lot of cables. The idea came into its own with the advent of prefabricated housing where all dimensions were exactly identical. The octopus box was factory-made and tested with tails of the right lengths to reach the lighting points and switches. On site, the sparks would place the octopus in position, unroll the cables and pull them in.

Cost a bit more in cable but saved time on site, plus one end of every cable run was terminated under ideal conditions at the factory so potentially more reliable.
 
Oh wow great picture, many thanks sparkychick

As best as I can tell, that was installed in 1957 and was in service until the cabling failed completely in 2018.

[ElectriciansForums.net] Octopus wiring lights


For lighting, the modern equivalent I guess is these:-

Surewire - Pre-wired Maintenance Free Lighting Junction Boxes - https://www.surewire.co.uk/
 
That’s a picture of a neat joint box... most look like a square plate of pasta.

We did used to call them spaghetti joints.

It sounds like the house in the OP needs a little time spent testing out each cable. There may be nothing else wrong than a couple of mixed up cables.
Access to the box will be the problem if it’s under carpet or flooring. The floorboards themselves will have a hatch above the box
 
Have used variations of this principle when converting switched modular lighting to PIR LED panels, can be a lot quicker that sorting the original fixed wiring, not always but a handy thing to use occasionally.
 

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