Blown X2 Cap in Mains Inlet RFI Power Filters (IEC C14, Schaffner, Schurter and others)

[Speedskater]

If there is a short to chassis and the Neutral fuse blows, yes the current stops.
But the chassis is now HOT.

 

[jean-paul]

No a metal chassis is usually and in the case of DIY definitely connected to PE.

 

[Speedskater]

Then the Hot fuse will also blow.
And while the PE/SG should be connected to the chassis at one end and the building main breaker panel Neutral at the other end, that doesn't always happen.
(at least in the US the error rate is high)

 

[jean-paul]

Sometimes airplanes loose an engine in flight 🙂

If the error rate is high things are either not well enough regulated/checked or there is chaos. Chaos is contradictory to safety. There is no adequate measure when chaos is normal and accepted.