main fuse blown

[growler]

was called out to house earlier where couple had returned from holiday to find they had no power. on closer inspection I discovered that the main 80amp fuse had blown, no mcbs or rcds had tripped. any ideas ?

 

[Octopus]

They can just go!

 

[Lagentium]

I have seen a main switch go due to the terminals in the cutout not being as tight as they should be, DNO came and rectified the fault, I got a head shake for cutting the seal.

 

[johnsparks23]

I've seen the line and neutral bars touch, in the service head, causing the supply authorities fuse to short out(blow).

 

[Richard Burns]

I have had similar where the cables in the meter shorted across two phases and took out the fuses.

I also had one where the customer shorted a cable while changing the socket and the main fuse went before the 30A 3036.

 

[Farmelectrics]

agree with murdoch they just go sometimes

 

[kyle12111994]

I've had a couple of service head fuses blow, very random times as well as there was no reason for them to do so.
I agree with Murdoch, sometimes they just pop.... Get the fuse changed and job done!

 

[telectrix]

get DNO to replace FOC and try and scrounge some seals at the same time.

 

[gnselectricals]

Had a plumber phone me changing boiler fcu blew main fuse call out for western power foc

 

[growler]

Thanks for your replies !!

 

[UNG]

Customer of mine had the main fuse blow due to a fault on a junction box this was followed by a smell of burning plastic didn't blow the consumer unit fuse
There could be a fault that has blown clear under fault conditions and taken the main fuse

 

[R G]

The old wylex push button breakers can be another one , when anyone trys to reset with a fault in place ,quite often takes out the main fuse ...

 

[UKMeterman]

The old wylex push button breakers can be another one , when anyone trys to reset with a fault in place ,quite often takes out the main fuse ...

At very high fault levels and a fault close to the consumer unit the main fuse could clear the fault because it takes a finite time for the contacts to move in the magnetic trip.