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Junction from lengthy wire

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Sarvesaa:
Dear friends,

I am planning to put some wall sockets under my workbench I am routing 2.5 sqmm wire through casing pipe and I am planning to put 4 junction box on the table to power the instruments.
Each junction box will have 2 three pin sockets and 2 switches to on and off them.


I am a begineer in electrical stuff and I am only 17.
I want to know whether my way of junctioning is proper. Please give your advices on it.

The green wire will be going to junction box where sockets are present. Do consider the colour code this is just an example.
The thick red 2.5 sqmm wire is live.

tautech:
STOP, leave mains wiring for someone that knows what they are doing as all you have done is make a death trap for some unfortunate soul that imagines the green wire to be mains ground !

ebastler:
Regarding the wire colours, I am not sure whether you meant to say that we should ignore them, since you intend to use different (and hopefully correct!) colours in your wiring?

But there are other things wrong with your connection. You cannot simply twist the wires together for mains power, nor should you solder them -- both methods are unsafe. Use proper screw or spring-loaded clamp connectors; these will make a connection that is stable over time (does not oxidize) and at high temperatures. Also, such connectors will provide proper isolation to make the connection safe to touch.

Given your lack of experience, I can only second Tautech: Please don't do this yourself! Your installation could create electrical safety issues as well as fire hazards. Please get help from a qualified electrician for any work on mains wiring.

pardo-bsso:

--- Quote from: ebastler on August 11, 2022, 06:31:13 am ---But there are other things wrong with your connection. You cannot simply twist the wires together for mains power, nor should you solder them -- both methods are unsafe.

--- End quote ---

As far as I know the local code here for residential installations does not mention solder as forbidden nor allowed.
Why is that a risk? (most of those installations here are done by twisting, works until you try to use a medium sized load a few years after, then all the lights flicker)

ebastler:
I can't find an "official" source right now. But the first answers (by John E Wulff and Ken Wallewein) in this thread describe cautions against soldered mains connections which I have heard/read before:

https://www.quora.com/Why-is-soldering-not-allowed-or-common-for-home-wiring

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