Supplementary bonding sounds dangerous!

[ban-all-sheds]

Isn't that scenario why there are limits on fault loop value so that the protective device on the Class 1 electrical equipment will operate before the touch voltage becomes high enough for long enough for it to be a risk to most people?

 

[Space cat]

Isn't that scenario why there are limits on fault loop value so that the protective device on the Class 1 electrical equipment will operate before the touch voltage becomes high enough for long enough for it to be a risk to most people?

Maybe those limits are the reason for the downgrading of earth bonding requirements. Personally, I prefer to have belt and braces.

 

[bernardgreen]

Bonding the tap to the wiring earth doesn't entirely eliminate the problem but it does help because the fault current now has a second route to true earth through the bond wire and the tap

In fact the wiring earth the socket supplying the failed equipment will be at the same potential as the case of the equipment so the tap bonded to that wiring earth will be almost the same potential as the case . ( a slight differenc will exist due to volt drop due to fault current along the flex ).

So tap and appliance at same potential means no shock.

 

[bernardgreen]

so catastrophically that the case would become live

Please don't shout.

One fault that often appears in bathtub failures is a transformer melting its bobbins due to a shorted turn and thus bringing some part of the mains winding into contact with the core.

 

[ban-all-sheds]

And the second fault which then occurs in this poorly designed item built using components from suppliers with poor quality control is?