8.5Kw Shower Tripping

[vision581]

Hello, I've read a few similar threads online but none come up with an answer.

I recentally replaced a 7.2 Kw shower with a Triton 8.5 Kw shower. But trips the mcb after of running the shower for 20 minutes.
While installing the shower I replaced the 6mm with 10mm T&E, and the 50 amp pull cord Isolator.
The cable runs 50% conduit 50% open air. 9 meter cable run
MCB Wylex 45amp
The cable stay's cool while running but the mcb gets very hot
Clamp meter reads 35.1amps.
and checked for any loose connections

 

[not clever]

Think about what you are saying here the old BS3036 boards had a 100amp main switch and busbar to match so why wouldn't fitting a retro-fit 60898 plug in mcb be compliant?

Depends on how many ways the cu is. 6 + = 100amp. The 4way I took out Tuesday is 60 amp

 

[RWJ]

Sorry everybody, I get fed up of reading how diy bob or my best mates granny "is a confident diyer" or I've done a niceic part p course and now take money off the gullible by trading as a sparks... but when they cock it up or it doesn't do as they thought, they want free advice!!

Listen in people EMPLOY A QULIFIED and REGISTERED ELECTRICIAN who can do the job.

Can you tell I lost out on a rewire to a "bloke down the pub" on Friday.

I don't mind loosing jobs to those because in a few months you'll get a call to put it right and the customer is often not impressed with a kitchen sink that tingles!

 

[Gazthesparky]

Think about what you are saying here the old BS3036 boards had a 100amp main switch and busbar to match so why wouldn't fitting a retro-fit 60898 plug in mcb be compliant?

Depends on the age but most of the old ones were fitted with 60amp and then later on they started fitting 100amp switches and I'm not sure where but I'm sure I've read somewhere in the past that the old wooden wylex boards were never designed to take bigger loads than 30 amp fuses.

 

[electric will]

Depends on the age but most of the old ones were fitted with 60amp and then later on they started fitting 100amp switches and I'm not sure where but I'm sure I've read somewhere in the past that the old wooden wylex boards were never designed to take bigger loads than 30 amp fuses.

i have also seen this somewhere and some of them had a separate way the other side of the main switch for a hrc fuse carrier

 

[Darkwood]

Depends on the age but most of the old ones were fitted with 60amp and then later on they started fitting 100amp switches and I'm not sure where but I'm sure I've read somewhere in the past that the old wooden wylex boards were never designed to take bigger loads than 30 amp fuses.

I see your point but look at it from another angle... do you seriously think Wylex would issue a retofit mcb that could put a overheating hazard on their old 3036 boards..... a recall would have been done over a decade ago if so...

 

[Gazthesparky]

This is all I can find for now I think the newer wylex fuse boards with 100amp switches will take more than 30 amp fuses.
Wylex Standard 6 way fusebox with brown wooden frame

posibly the metal clad units will safely take the 45 amp plug in mcb s but certainly the brown units were never designed for the big loads

 

[Darkwood]

This is all I can find for now I think the newer wylex fuse boards with 100amp switches will take more than 30 amp fuses.
Wylex Standard 6 way fusebox with brown wooden frame

posibly the metal clad units will safely take the 45 amp plug in mcb s but certainly the brown units were never designed for the big loads

I see which ones your on about now but really does leave a nasty taste in the mouth that one can purchase a fuse designed to fit the old BS3036 yet it shouldn't be used on the old wooden frames 60amp rated.
Having said that anyone fitting a shower should be pricing for a board upgrade or at least discussing it with the customer as getting rcd protection would be required as per manufacturers instructions in the new shower - regardless of whether the old one had protection or not.

 

[DPG]

That would explain the lack of RCD...

I may have missed something here, but how do we know the CU hasn't got RCDs? Daz

 

[GLENNSPARK]

i could smell the non-competance on this poster after his first post....
yet it took up to #9 to suss it out...
slippin lads....slippin...

 

[Darkwood]

We have to assume their is no RCD considering the age of the dist' board coupled with the disappearance of the OP..... he's still there lurking about this thread but unless he tells us otherwise we can assume hes avoiding an onslaught of negative response when he acknowledges our concerns

Also considering he's an Electrical Engineer qualified to the 16th he may require a bit of catching up as his knowledge of regulations is possible several yrs out of date.