Melted 45A dp switch

[Kayos]

Hi - looking to pick brains and confirm my own thoughts. Iwas called to a house today as the shower had stopped working. Checked the wall mounted 45A switch and both line & neutral terminals on load side had melted. The circuit checked out fine- low zs, clear on insulation test. The shower is a 8.5kw on a B32 mcb & rcd protected-neither breaker orrcd have tripped. Would the likely cause be loose connections when originally installed? Appreciate some guidance if my thoughts are incorrect.

 

[monkey5]

i would say loose connections, probably cheap 45a switch too.

wayne

 

[Andy™]

if heat damage is only local to connection (and not damaged throughout), then loose connection

 

[Kayos]

Thanks guys for quick response- nice to have my thoughts confirmed

 

[batty]

Could just be the switch is not up to the job more likely as both L and N are affected generally loose connection only one side is affected. Might be an idea to put it on a b40 breaker too.

 

[SPECIAL LOCATION]

Hi - looking to pick brains and confirm my own thoughts. Iwas called to a house today as the shower had stopped working. Checked the wall mounted 45A switch and both line & neutral terminals on load side had melted. The circuit checked out fine- low zs, clear on insulation test. The shower is a 8.5kw on a B32 mcb & rcd protected-neither breaker orrcd have tripped. Would the likely cause be loose connections when originally installed? Appreciate some guidance if my thoughts are incorrect.

I would say you are approx 700% spot on there...

If I were a betting man I would stick my

 

[Lurch]

Hi - looking to pick brains and confirm my own thoughts. Iwas called to a house today as the shower had stopped working. Checked the wall mounted 45A switch and both line & neutral terminals on load side had melted. The circuit checked out fine- low zs, clear on insulation test. The shower is a 8.5kw on a B32 mcb & rcd protected-neither breaker orrcd have tripped. Would the likely cause be loose connections when originally installed? Appreciate some guidance if my thoughts are incorrect.

How old is the shower switch and cabling? I've known equipment terminals loosen over time. Not an entirely uncommon situation.

Might be an idea to put it on a b40 breaker too.

After checking cable calcs obviously.