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PostPosted: Wed Apr 04, 2018 11:24 am 
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Hello everyone, I have a question about a shower consumer unit. Could I add one to this set up below. It's an old fuse box. Currently the electric shower is running off a 30amp fuse. We want to upgrade to a 10kw shower so need 10mm wiring and at least a 45amp breaker.


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PostPosted: Wed Apr 04, 2018 11:56 am 
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The cheapest way would be to add a enclosure and a breaker

Best option would be to replace the board



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PostPosted: Wed Apr 04, 2018 1:34 pm 
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Make sure you have RCD protection on the shower whatever way it is done.



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PostPosted: Wed Apr 04, 2018 1:37 pm 
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Be it a new consumers unit or an upgrade, either way its NOT a DIY job

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PostPosted: Wed Apr 04, 2018 4:12 pm 
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Bob225 wrote:
The cheapest way would be to add a enclosure and a breaker

Best option would be to replace the board


Is that the same thing as dedicated shower consumer unit?


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PostPosted: Wed Apr 04, 2018 4:17 pm 
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Something like this?

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PostPosted: Wed Apr 04, 2018 4:58 pm 
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Yes one of those, henley block to take a live + Neutral + earth from the CU to the new unit.

As said not a DIY job, must be installed correctly and checked by a pro.

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PostPosted: Wed Apr 04, 2018 5:29 pm 
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Just as a point of interest,

Shower consumers unit £30 + tails (£12)+ henley connector (£8)

10 way consumers unit £72

I know what I would have done.

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PostPosted: Wed Apr 04, 2018 5:44 pm 
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Thanks everyone for all the help and I won't be tackling this job myself, I will call in a qualified sparky.
@someone-else will a new CU be suitable for oldish wiring (black and red) without rewiring/updating.
These new CU are super sensitive so I don't want to be rewiring if it can be helped. We have just had the whole down stairs skimmed and decorated.


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PostPosted: Wed Apr 04, 2018 6:47 pm 
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manny wrote:
These new CU are super sensitive so I don't want to be rewiring if it can be helped. We have just had the whole down stairs skimmed and decorated.


The age of the wiring isn't the issue, the condition of the wiring is what counts. IF you go down the route of a new CU the sparky will check the soundness of the installation/insulation on all the circuits and advise accordingly.

The other option as per above with henley block and seperate rcd/breaker the sparky might recommend an upgrade to the CU but only needs to test the new circuit for compliance.

Your choice.

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PostPosted: Wed Apr 04, 2018 9:52 pm 
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someone-else wrote:
Just as a point of interest,

Shower consumers unit £30 + tails (£12)+ henley connector (£8)

10 way consumers unit £72

I know what I would have done.



Do a full test of all circuits before swapping the CU or just swap it and see what happens??


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PostPosted: Sat Apr 07, 2018 5:27 pm 
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Update: had sparky come down and have a look, he recommended going for the shower consumer unit. Also he recommended using 25mm tails from the Henley to the shower cu.
The current fuse board has 16mm tails, will this be an issue? (Not sure if he is going to upgrade the old 16mm to 25mm)


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PostPosted: Sat Apr 07, 2018 6:55 pm 
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manny wrote:
Update: had sparky come down and have a look, he recommended going for the shower consumer unit. Also he recommended using 25mm tails from the Henley to the shower cu.
The current fuse board has 16mm tails, will this be an issue? (Not sure if he is going to upgrade the old 16mm to 25mm)


Sounds like he knows his onions. The 25 milly tails will be because of the main fuse which will be rated at a higher amperage than the shower.

(can't see the main fuse buuutttt he has.)

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PostPosted: Sat Apr 07, 2018 7:59 pm 
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I would say the 16mm tails are irrelevant. The photo you posted suggests that the incoming supply is fused at 80A or 60A.


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PostPosted: Sat Apr 07, 2018 8:11 pm 
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OnlyMe wrote:
I would say the 16mm tails are irrelevant. The photo you posted suggests that the incoming supply is fused at 80A or 60A.


Actually could you post another photo of the cut out that shows a bit more detail lower down. In particular the label below the earth block.


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