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Discuss Consumer Unit replacement cables not long enough. in the Electrical Forum area at ElectriciansForums.net

FatAlan

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Ok, so you have a motley collection of old BS3036 fuse boxes that need to be replaced by a new consumer unit. Existing installation tests all good but the T&E coming out of the wall is spread out and not long enough. What do folks do to extend cables or what’s the recognised best practice to ensure a neat and compliant job? Any pics?
 

buzzlightyear

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Arms
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Move the cu to the write height.
Move the wall.
Extend the cable.
Junction boxes.
And the list goes on what would you like to know.
 
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Andy78

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If they all need extending then a dinrail enclosure would be best. Either use dinrail connectors or wago 221 cradles.
 

Midwest

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Connectors and/or rewire initial legs. If its every circuit, separate enclosure as already suggested
 

FatAlan

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  • Thread Starter Thread Starter
  • #7
Obsolete VOLED and no RCD. Was on a TT with very high Ze. Couldn’t locate the earth rod and suspect it’s burried under old extension. DNO has now put in a PME connection and Zs now good.E27A298A-BEF3-45C7-9615-F34C3BA0D7CE.jpeg
 

FatAlan

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  • Thread Starter Thread Starter
  • #12
Reckon the top box will be ok but the three circuits from below could be extended. Just looking for views on seperate enclosure, and connections really. Extending initial legs not option as classic case of client having loads of work and decorating done without thinking about the electrics until too late :rolleyes:
 

Richard Burns

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For only four cables needing to be extended upward I would just put a junction box on the wall at the point of the lower consumer unit and push fit wire connector the cables upward to a new CU at the MEM board position. It hardly justifies the use of a DIN rail enclosure, though it would be neat.
 
Best method is to crimp and heat shrink. Anything else would just look rough.

You could also use the existing box to house wago connectors but it doesn't look like you got much room for that.
 

Andy78

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I tend to use a lot of 100x50 trunking when doing domestic consumer units, both changes and rewires.
The connections could be housed in there either just in the trunking or in a single box with a blank plate.

It's a useful method to adopt anyway for most jobs as it tidies up all the cables usually, and gives a place to put accessories such as alarm spurs, single sockets, light switches etc
 

telectrix

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i'd replace lower box with a din rail mad. box, and extend the lower cables with din rail connectors up to new CU where the top box is.
 

FatAlan

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Trainee
  • Thread Starter Thread Starter
  • #19
Thanks for the suggestions folks. Half the trouble with this lark is getting familiar with the products out there.
 

FatAlan

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  • #21
The bottom cables, is it floor boarded ?, can you pull some slack up.?
No slack I’m afraid. It’s a 1950’s semi with what you can see being at the back of the usual small under stairs cupboard.
 

GBDamo

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Supporter
Ok, so you have a motley collection of old BS3036 fuse boxes that need to be replaced by a new consumer unit. Existing installation tests all good but the T&E coming out of the wall is spread out and not long enough. What do folks do to extend cables or what’s the recognised best practice to ensure a neat and compliant job? Any pics?
Saw this today and thought you may be able to get a few pointers from it.

20190221_164907.jpg
 

Gavin John Hyde

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Arms
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I am a bit of a din rail nut. i just like how they look so nice when dressed properly. so a nice plastic enclosure with din rail connectors for me. might add £20-25 to the materials depending on your wholesaler.
 
S

Squid

Rewire the whole house and book a holiday to the caribbean.........
 

GBDamo

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Supporter
I take it that the installation isnt on its side like the photo :D
No, I took it in landscape to capture all the elements of professional excellence on display.

A true thing of beauty, no?

Oh and don't even fart near it or it'll be off the wall.
 
S

Silly Sausage

No slack I’m afraid. It’s a 1950’s semi with what you can see being at the back of the usual small under stairs cupboard.
If you trawl the forum, a few years back, some of the guys had posted pictures of fine examples of extending cables to CUs solutions.
 
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