What would cause an immersion wire to burn out?

[Millsy 82]

I fitted a new cylinder and wired up an immersion before Christmas went back out this morning as her hot water had stopped working.

I thought it had just tripped out on the stat as they usually do but the wire from the thermostat to the element had burnt out completely.

Could it be a power surge? I would of thought that would of taken out the economy 7 programmer before that wire.

Could it be a loose connection on the element?

 

[stevetheplumber]

loose connection is the most likely the wire would be man enough to take a momentary power surge was it a new cable and was it tight on the terminal?

 

[townfanjon]

Yep loose connection somewhere, old wire?
it does need to be 2.5 though, I have seen loads of 1.5 .

 

[Millsy 82]

It was the cable running from the thermostat to the live on the element and it burnt out on the element end. I'm just wondering if it wasn't connected properly to the factory made end.

 

[townfanjon]

Blimey , never seen that pal. Yep I would have said that was probably why, unusual though

 

[Leo21]

It happens on electric showers as well, got to get a good tight connection.

 

[AWheating]

Prob a loose connection but also a good idea to check the elements resistance is ok.