Loss of mains without tripping any switch

[Steve888]

Hello

Early in the morning I lost the mains without any signs of tripping.
The mains fuses was OK
The 100A switch was OK
All RCBO ok
The loads in the house very low maybe 100W. The smart meter was powered OK

I had to switch off and back on again the 100A mains switch to bring the mains back in again
Very weird case. Do.you know what happen?

 

[suffolkspark]

Possible loose connection in your board if the smart meter stayed on

 

[SJD]

Or a faulty main switch on the fuse box / consumer unit - one of the contacts not making contact properly.

In either case, I would have it checked, rather than wait for it to fail completely at an inconvenient time.

 

[telectrix]

or a dodgy main switch.

 

[Mike Johnson]

When was your smart meter installed?

 

[littlespark]

This should be looked at as soon as possible, and by a professional.
A loose connection can overheat.

 

[James]

Can’t you post a picture of the main switch that you turned off and back on that fixed the fault?

 

[Vortigern]

If it is an MK CU then they switch off to half mast and may look like they are still on. You have to turn them fully off in that situation to turn them on again.

 

[pc1966]

Worth posting a photo of your supply/meter/consumer unit arrangement for the folks here to look at in case they spot something non-obvious with it.

As others have already said the big worry here is a loose connection on the meter tails, main switch, etc., as under load that is a major fire hazard.