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Please Help with new shower

topcap69 Avatar
7y, 11m agoPosted 7 years, 11 months ago
Hi All

I have just had a plumber install a new 10.5KW shower (upgraded from a 9.5KW). The plumber said he did not believe he can do the electrics as reading the install guide it says it recommends a 45A MCB and a 45A Switch. I currently have a 40A MCB and unsure what the switch rating is.

I phoned up 2 electricians both say they will do it and to ignore the guide and a 40A MCB will provide better protection than a 50A one (they don't do a 45A anymore apparently) and that I don't need to change anything, but neither would provide a certificate for the install so I am unsure who trust.

Should I just connect shower if this is all that is needed or should I demand the MCB/switch is changed and that I am provided with a certificate for the install.

So much stress just want it to be safe for use
topcap69 Avatar
7y, 11m agoPosted 7 years, 11 months ago
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(18) Jump to unreadPost a comment
Comments/page:
#1
Dont stress over something so simple.

Choices are

Legal with a certificate

Not legal with electrician wiring it.

Not legal with you wiring it.

If you are competent and are happy to have a installation which is not certified do it yourself and save money.

If you feel you need the certificate you only have one option which is new MCB.
banned#2
40 x 240 = 9.6kw
45 x 240 = 10.8kw
50 x 240 = 12kw

answer you shouldn't have got a 10.5kw shower, you ever watched your electric meter when you have the shower on? it's scary
banned#3
as a comparison all these running at the same time
http://www.argos.co.uk/wcsstore/argos/images/4802084A62UC95710M.jpghttp://www.argos.co.uk/wcsstore/argos/images/4802084A62UC95710M.jpghttp://www.argos.co.uk/wcsstore/argos/images/4802084A62UC95710M.jpghttp://www.argos.co.uk/wcsstore/argos/images/4802084A62UC95710M.jpghttp://www.argos.co.uk/wcsstore/argos/images/4802084A62UC95710M.jpg
banned#4
starsparkle2311;3807795
why did you let the plumber install it then? Is 1 kw gonna make that much of a difference?

not really.

take note that without a certificate you may have difficulty selling if the buyers solicitors ask to see it. thats without the legal side of things.
#5
why do you need a certificate?. 40a mcb will cover it no problems. if it does give you problems , change it to a 50a one.takes about 5mins to do. don't forget the guide only......recommends.
#6
also depends what cable is running to the shower and how the cable is fitted

There are lots of variables

But I would not fit a 10.5kw shower with a 40amp breaker (MCB) 10500w x 240 volts = 43.75 amps so a 40 amp breaker is marginal

Also if you have 6mm cable buried in plaster then this will not be enough either - you would need 10mm cable. Thats why the electricians won't give you a certificate.

hth

EliTom
#7
tdogg
why do you need a certificate?. 40a mcb will cover it no problems. if it does give you problems , change it to a 50a one.takes about 5mins to do. don't forget the guide only......recommends.


Dangerous statement - a 50 amp MCB should be used with 10mm cabling. Bet the OP has 6mm cable.

EliTom
#8
You need a certificate with any electrical installation now don't you.

OP either downsizr the shower (probably a bit late now) or upgrade and pay for the certificate.

You really should have had this pointed out to you before the work began.

As for the electricians you are phoning they are obviously cowboys. The fact that they will not give you a certificate is telling you something isn't it?

Get the indians they will be cheaper and give you a certificate.

p.s Lumoruk, I really wish you hadn't put that post up especially around Christmas££££££££££££
#9
lumoruk
40 x 240 = 9.6kw
45 x 240 = 10.8kw
50 x 240 = 12kw

answer you shouldn't have got a 10.5kw shower, you ever watched your electric meter when you have the shower on? it's scary


I know what you mean. Nothing makes that little red light flash faster. I used to be woken up some mornings by the sound of the tick-tick-tick my meter made as my flatmate had his morning shower. I'd then go back to sleep and wake up thirty minutes later with him still being in there. Electric bills were painful to say the least. Likewise were the gas bills, as he was a clean-freak who obsessed about using the hot tap to wash plates and cuttlery before and after every meal, and being diabetic, he was constantly cold, so needed to have the heating into the mid 20cs.

All of which makes me feel slightly less guilty for being due him a few figures for the last quaterly bill.
#10
As indicated by some of you good folk the cable is 10mm hence the reason for going for the 10.5kw though it would be more powerful.

I spoke to Triton and they indicated there should be no issue with a 40A MCB, but if I do find it tripping just up it to a 50A MCB and the consumer unit makers (Crabtree) no longer make a 45A MCB.

Will ask another electrician to fit it and ask for the certificate
banned#11
topcap69
As indicated by some of you good folk the cable is 10mm hence the reason for going for the 10.5kw though it would be more powerful.

I spoke to Triton and they indicated there should be no issue with a 40A MCB, but if I do find it tripping just up it to a 50A MCB and the consumer unit makers (Crabtree) no longer make a 45A MCB.

Will ask another electrician to fit it and ask for the certificate


No one is going to know that the MCB has uprated, do it yourself :thumbsup:
#12
topcap69
As indicated by some of you good folk the cable is 10mm hence the reason for going for the 10.5kw though it would be more powerful.

I spoke to Triton and they indicated there should be no issue with a 40A MCB, but if I do find it tripping just up it to a 50A MCB and the consumer unit makers (Crabtree) no longer make a 45A MCB.

Will ask another electrician to fit it and ask for the certificate


if the cable is definately 10mm then any reputable leccy will fit a 50amp breaker and give you a certificate.

Or as mentioned - just fit a 50 amp breaker yourself ! - but beware when you come to sell the house you may have to prove that the install was done within the part P guidelines

EliTom
banned#13
elitom
if the cable is definately 10mm then any reputable leccy will fit a 50amp breaker and give you a certificate.

Or as mentioned - just fit a 50 amp breaker yourself ! - but beware when you come to sell the house you may have to prove that the install was done within the part P guidelines

EliTom


Doesn't the buyer have to ask for the certificate? I don't get how it works because our electric is a mess nothing looks post 2005/6 tho. Who looks round the house and decide something has been modified? I.ve done loads on my house mostly in the kitchen with dated wire which they could date code i suppose. We bought it last year nothing was mentioned about the electrics other than the seller saying the house was safe to live in.
#14
like i said 40a is fine , i used to fit bathrooms and never seen a 50a fitted anywhere, always 40a, if it gives you trouble, change it. you got 10mm cable so thats fine, the run also makes a difference to the type of cable, best to always use 10mm now to future proof it as changing a shower cable is a bu**er!. you don't need certification to change the type of wattage shower you use. personnally would not fit less than a 10.5kw now as it gives good power compared to a less rated one. last thing you want is a shower dripping out water. the golden triangle of life.....good mattress...pillow and shower!.personnaly i hate electric showers, combi shower is the best.
#15
im just wounding around .. if it has a 40A MCB then DONT UPGRADE to a 50A.. the odds on the Cable wont handle 50A and MELT

the MCB is to protect the Cable also the voltage in today is 230 and they do want to drop it down to 220 with the rest of the EU
what measn 40Ax230v=9200 what is 9K2W and at 40Ax220v=8K8W

So what shower you can have wattage wise depends on the Cable size.. dam THICK stuff needed for a 10kW

as for the wiring, back 5yr ago you could do it yourself Repace one bit and then the other !! strange hay and in such a scary area for electricals, but knower days for insurance and such you need a qualified one (someone to blam if it goes wrong, and he will do time if it goes nasty wrong)
#16
angellahash
im just wounding around .. if it has a 40A MCB then DONT UPGRADE to a 50A.. the odds on the Cable wont handle 50A and MELT

the MCB is to protect the Cable also the voltage in today is 230 and they do want to drop it down to 220 with the rest of the EU
what measn 40Ax230v=9200 what is 9K2W and at 40Ax220v=8K8W

So what shower you can have wattage wise depends on the Cable size.. dam THICK stuff needed for a 10kW

as for the wiring, back 5yr ago you could do it yourself Repace one bit and then the other !! strange hay and in such a scary area for electricals, but knower days for insurance and such you need a qualified one (someone to blam if it goes wrong, and he will do time if it goes nasty wrong)

Scary stuff. oO

http://i6.photobucket.com/albums/y202/personalitytest/bathtub/psycho.jpg
#17
BRINGING A THREAD BACK FROM NEARLY SIX YEARS AGO... WHAT'S WRONG WITH YOU PEOPLE?!
1 Like #18
iCoxyyyy
BRINGING A THREAD BACK FROM NEARLY SIX YEARS AGO... WHAT'S WRONG WITH YOU PEOPLE?!

I know.....it's first outing too.

Expect to see this in a couple of years time.

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