Shower fault

[ezekiel]

need some advise please,

new shower stopped working and upon investigation i discovered that the mcb had burnt on the button where it connects to busbar, and the busbar cover was melted - how could this happen?

shower is 9.5kw
50a mcb (only size available for db)
about 7 metre cable run in 10mm clipped direct no insulation
rccb side of db

 

[slup]

Most likely just a loose connection...

 

[ezekiel]

on the actual mcb where it joins busbar?

 

[rebuke]

How does it connect to the bus bar (it varies between manufacturers). If it was a screw terminal, it was probably just not done up tight enough, causing some arcing...

 

[RF Lighting]

Or maybe it was a 'less good' brand of CU which was not suitable for a 50A load.

 

[ban-all-sheds]

So when you replace the CU (notifiable - are you registered?), pick a good one, and do the screws up tight

 

[ezekiel]

goin to split tails to seperate cu for shower

 

[ban-all-sheds]

You still need to replace the one you've melted.