Mira Sport Max 10.8KW

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markspark101

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Hi everyone,
I am a newby to this site so bare with me. There's some great advice out there so hopefully you can help. I have recently bought a new shower to replace my old and defunct shower and have decided to go for the highest rated one (10.8KW) that is consistent to my current wiring (10mm). I am a little confused re MCB config etc at the CU. Please take a look at my photo (if you can see it - not sure have this works) in my album and provide any advice you can offer. Thanks. Mark
PS. The position of the old pull switch for the shower is right next to the shower and can easily be reached by someone in the shower. This contravenes code. I want to move switch to a better position, but this will mean having to join the cable. What are my options? And, regarding needing an inspection cover is via the floor (under the carpet) above sufficient? I do not want an unsightly inspection cover in the newly plastered ceiling in the shower-room!
 
Hi,

Welcome to the forum. I'm afraid I can't see your photo. A couple of questions though:

What was the rating of your old shower?

Are you sure it's 10mm cable?
 
Cannot see the photo. 10.8kW = 45A @ 240V. Do you already have a 45A MCB protecting the circuit ? Is the circuit protected by a 30mA RCD ?
 
Mark,

Your username suggests you might be an electrician of some kind or are training to become one. Is this the case? Could you tell us what your electrical background is? The reason for asking, is that this work is probably notifiable under part P of the building regulations. That means it's probably cheapest to get an electrician to do (someone registered with ELECSA, NAPIT or NICEIC).

Edit: I see you are planning on getting someone else to certify your work. That's dodgy to say the least. However, that being the case, why don't you ask the person who will be signing it off to advise?
 
Sorry for the confusion. My user name is a red herring. I am a competent DIYer that has done own work for years before new legislation kicked in. I have no problem with it, but enjoy doing things myself and have a local electrician reading to make final connections, check, test and sign off when I'm ready.
It costs me though to get him out so joining this forum seemed a good idea to get some good advice first.
 
I sympathise with your situation. I would also describe myself as a "competent DIYer".

Anyway, the person who is signing off the work must be happy with every aspect of it. They should be involved throughout.
 
Yes, your photo shows a 40A, Type B MCB in it's own consumer unit.

It would be useful to see a wider picture (literally). I suspect that you may not have RCD protection on that circuit though. This isn't a big problem, but will need to be sorted before your friendly electrician can sign off.
 
RossR, I understand that. The work is very simple really and I have the ceilings down in the shower room (it's getting a complete make-over while I am at it) and I have easy access to the CU. All connections will be visible for my electrician.
 
I'm not sure I'd agree that it's very simple.

Your circuit protective device is rated at 40A. Your shower is rated to draw 45A. Is that a problem? The answer is complicated.

Would it be OK to fit a 45A protective device? (There are at least 3 things you'd need to check)

You say the position of the pull cord switch contravenes code. What height is the ceiling?

Please, get the electrician to advise you. If you do something that he isn't happy with it will cost you to correct your mistake.

Also, shower circuits are amongst the most dangerous in domestic electrics. No one wants you to be electrocuted, or your house to burn down.
 
RossR,

We may have got out of sync with our messages. Did you see my last photo? I know that the current MCB etc will have to replaced I believe with a new and separate RCD protected CU with a MCB rated at 50A .

And to reassure you I absolutely do not underestimate the importance of getting this right, but as I said before I enjoy doing this stuff and would not be happy to just sit back and pay for someone to come in and do everything for me without understanding the solution to the problem.

I just wanted to discuss with some like-minded people....

Mark.
 
RossR,

I forgot to answer your ceiling height question. The ceiling is 2.35m and could be reached by someone standing in the shower that had quite a step up into the shower-tray. Now, I'm lowering the shower but I don't think you should be able to activate the shower cord easily from within the shower. the new position will be in the corner of the room well out of reach. I'll post another photo... Mark.
 
Yes, we got a little out of sync. I saw your photo. Unfortunately it's difficult to make out much detail. That's the problem with wider shots! :roll: I'm not afraid to admit that I'm not familiar with some of the eqipment shown in your photo too. You might have an RCD in the box at the right hand side. I don't know what it's supplying though. Is the green circle a button?

The easiest way to add RCD protection is probably as you say, replace the shower consumer unit with one incorporating an RCD.

Can I ask what the coiled up cable and connector block is doing above the consumer unit?
 

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