Extending single core cables

10 Dec 2008
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Jersey Marine
United Kingdom
Having to fit a 200x90 extract duct through an external wall (Timber fame-cavity-brick)
Brickwork cut neat, cut inside dry lining fine ... removed insulation and three are 2 single core cables (6181Y 1.5mm2) right through centre of where duct needs to go.
Had no option duct has to go though a this point.

It is not an easy job to replace these - would need a large number of 8x4 dry lining sheets removed.
No option to remove floor above due to underfloor heating

I have drilled in a new hole in timber frame header (horizontal) to the left to allow reroute.

The is not enough slack in the singles to do this .... and easy solution would be to cut each single and splice in a 12" extension. I can make the cut so this happens above the header plate, and it can be clipped to joist for mechanical support.

The splice ... is it acceptable to solder connect ? .,.... I could solder, insulate & sheath with double layers of heat shrink, and mechanically fix .... simple & neat.
Is this acceptable under 17th Edition ?

Not that any inspection taking place .... but prefer to do things right.

Alternative but bulky & not so easy is to splice in with 2 x Ashley J804 junction boxes.
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Yes, soldering is fine - done properly - joints should be mechanically and electrically sound before soldering.
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