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Posted By Topic: joining wires in a wall

rarrar
Sep 09 2017 18:26

what's the story with joining wires in a wall that's going to be closed over so they become unaccessible?
   

DougP
Sep 09 2017 20:27

3.7.3
   

jasmoon123
Sep 10 2017 12:32

I was taught it is good practice to have the cable join accessible (Note - good practice is sometimes different to, and in this case is, the minimum requirements of the standard).

The join would be behind a blank cover plate or run a new cable from the fitting up to a j-box in the ceiling cavity.

Surely if the wall is not lined yet then a small length of new cable is easy to install.
   

DougP
Sep 10 2017 19:08

Of course, this has all been discussed before.

The bottom line is that fittings like connectors, are required to be accessable. ESR 20(2)(i). So that rules out junction boxes.

You could do a permanent connection, with crimp links and insulation "equivalent of the original cable insulation and sheathing", but in my opinion, that would take around 10-15 minutes or so, and make it uneconomical. But there is nothing prohibiting it, other than "workmanship".

If at all possible, the simple and quick solution would be to remove the cable back to an accessible location, and use a junction box (or two).


https://www.electricalforum.co.nz/index.php?action=more_details&id=1375862718

https://www.electricalforum.co.nz/index.php?action=more_details&id=1428535658


https://www.electricalforum.co.nz/index.php?action=more_details&id=1469064422
   

rarrar
Sep 11 2017 16:38

3.73 defines joints but not accesability
   

zl2aj
Sep 12 2017 08:16

ESR 20(2)(i) sets out the requirements for accessibility (in that if it is inaccessible it is unsafe). ESR 13 sets out the requirement for PEW to be electrically safe.
   

Sarmajor
Sep 12 2017 17:34

Depending on your interpretation of ESR (i) there is a exception for cables. So a permanent joint as described by Doug would not be unsafe. A hidden junction box would be.

But for most domestic work running a new bit of cable from point to point would be a better solution.