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Hi guys

My tenant just had an electrician in to connect her cooker and has told her that the shower is dangerous and not to use it because it has a 40 mcb in the consumer unit and it should be a 32.
The cable is 6mm and the shower is 8.5kw.

Can you advise me please
Thank you in anticipation
 
It is NOT dangerous, it is correct.

What would be dangerous is putting in a 32a MCB as it could overheat.
Why would a 32A cause it to over heat and not a 40A as fitted. Surely the issue is whether the cable can take the current? If this is running at over 32A and the 6mm can take the current based on length and installation 40A must be correct? 32A wouldn’t cause overheat it would just trip.
 
It is NOT dangerous, it is correct.

What would be dangerous is putting in a 32a MCB as it could overheat.
Why would a 32A cause it to over heat and not a 40A as fitted. Surely the issue is whether the cable can take the current? If this is running at over 32A and the 6mm can take the current based on length and installation 40A must be correct? 32A MCB wouldn’t cause cable to overheat it would just trip.
 
You are right, the cable loading is still the same. It's the 32A mcb that will likely be running a bit warmer than a 40A mcb, with that 35A load. Neither MCBs will trip with that load, unless teenagers are involved.
 
If you think the term 'Part P Registered' is bunkum, take a look at these search results:-

part p registered - Google Search - https://www.google.com/search?q=part+p+registered&client=firefox-b&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjk_ri9_ezgAhUSVBUIHeISC4sQ_AUIDigB&biw=1920&bih=903

Part P Registered is a phrase from the schemes and is used it seems to promote sparks who are registered with them who can carry out notifications. After all, Part P is the section of the building regs that requires us to notify, so the term 'Part P Registered' get's used to indicate a particular company can notify.

The Part P exam is C+G 2393, with the proper title being something like 'Building Regulations for Electricians' or words to that effect. But in common parlance it often gets called 'The Part P exam'.

And BS1363 plugs have been called plug tops as far back as I can remember.

I started calling light bulbs - lamps, after comments on here by members But then my customers thought I was referring to luminaires, which they call light fittings; so I went back to using he term light bulbs. :)
 
they not plug tops. theys plugs. a plug goes into a socket. a plug top covers the live parts (in a plug). we don't refer to sockets as plug bottoms.:D:D:D.

Plugs were on the walls, as well you know 'cos of your age. They also had plugs on the ends of appliances leads. Thats why Joe public called em plugs & plug tops. :rolleyes:
 
We've all heard this story before. Just because some people got it wrong 100 years ago does not mean we have to perpetuate this myth now.
How very dare you. @telectrix is not over a hundred years old!

Anyway, I think its an urban myth you can provide a 40A supply on a 6mm cable, in most domestic properties :p
 
@GeorgeCooke ,

Whilst I can acknowledge there are times when the correct terminology is an absolute must (such as the difference between r1 and R1 for example), the vast majority of the time, it doesn't matter that the terminology is not 100% correct.

If you say transformer to a client they know it's a device that converts the mains into something else. They don't need to know that in fact it's an electronic switch mode power supply unit. Say that to them and they'll look at you as though you're from outer space.

Likewise... plug and plug top (meaning the thing on the wall and the thing you shove in it), bulb (meaning the thing in a lamp that makes the light), fuse (meaning the circuit breaker in the fuse box (meaning the consumer unit) that they have to switch back on if it trips). Just a few examples.

As a consequence of having to use client speak, it is inevitable that we will use these terms here and guess what... the world is still turning.

If the only thing you can offer to a thread is to critique someone's use of language when the vast majority of people here know what the others are saying, then I'd suggest you simply skip the thread and ignore it. As I said above, there are times when it is critical the correct terms are used, but for everyday objects such as light bulbs, plugs etc. it's not the end of the world especially when the vast majority of people will understand what is being said.

Whilst this constant nit picking gives some of us comedy material from time to time, it is getting to be somewhat tiresome and can result in the thread being de-railed somewhat. So, as I've said, if you have nothing more constructive to add to a thread other than a critique of the terminology being used, move along to a different thread where you can contribute in a more constructive manner.
 

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