Changing an MCB....

[Teddy54]

Hi folks , I need to change and MCB in my flat as the rating is to low for the circuit its supplying, Only problem is I have never seen this kind of busbar before. Its goes were the Breaker is sat on top of the busbar just behind the screw/clamp and not actually in the seperate bit at the back on the bottom side.

Now my questions is , am I ok to buy a normal breaker and just cut out the pop outs at either side of the screw and sit the breaker on this way?

Hope this makes sense and any help greatly appreciated.
Cheers

 

[Teddy54]

Is the rating the same as the previous one?

Yes exact same

 

[telectrix]

what's the kW rating of the new shower?

 

[Spazz]

Can I ask are you a sparky or a DIYer?

Not a problem either way - just so we know what Level to talk to.


Its sounding like a fault, no shower should trip at 32A at all.

If you upgrade it, you will have bigger problems as already said.

 

[Teddy54]

Can I ask are you a sparky or a DIYer?

Not a problem either way - just so we know what Level to talk to.


Its sounding like a fault, no shower should trip at 32A at all.

If you upgrade it, you will have bigger problems as already said.

Iam a 3rd apprentice. Not done alot of house bashing though which is why Iam a bit puzzled.

 

[pjcomp]

The circuit breaker is there to protect the cabling. What size is your shower? Has it been upgraded without the cable being upgraded accordingly?

PJ

 

[a1guvner]

Out of interest whats the shower rating

 

[Teddy54]

9.5 is the rating, same as the old one.

 

[Spazz]

am I right in saying Power Formula

P=VI
=32x230
=7360
=7.3KW Shower

Is this what you have Teddy?

 

[Darkwood]

yes was just going to say that a1guvner..... how many hours are they in the shower for???? as the info you've supplied wouldnt have tripping issues unless their is other cable, shower, install method issues.

 

[Spazz]

That explains it -
V=P/I
=9500/230
=41.3A Draw

 

[Teddy54]

That explains it -
V=P/I
=9500/230
=41.3A Draw

So whats the best way to rectify it?

 

[a1guvner]

Back to get a proper fitting mcb, dont refabricate its housing to suit your install, you have waited this long with it tripping a little bit of time finding a proper fitting breaker

 

[Spazz]

Teddy

Take a picture of your CU and MCB and post it on here.
Along with the Make and Model if you have that

 

[Teddy54]

Back to get a proper fitting mcb, dont refabricate its housing to suit your install, you have waited this long with it tripping a little bit of time finding a proper fitting breaker

Yes i know, was just a bit of daft thinking earlier on as had never been in the situation before.

 

[a1guvner]

we got there in the end, but as Nicholas said a picture tells a thousand words