metal light switch

[John D v2.0]

Also, if the main earth connection is made to the face plate, the connection to the steel box (and remaining parts of the circuit) will be broken when the plate is removed. And that is how the live steel box could kill someone.

I'm sure the RCD will have tripped by the time these live cables have bumped against the steel box enough to cut through the insulation

 

[bernardgreen]

So there is a great possibility of the steel box cutting into the inner and outer cable sheath, and that is why the boxes should be permanently connected to earth with flying leads to face plates.

Grommet should be fitted

And that is how the live steel box could kill someone.

If the box became live when the face plate was in place then the RCD and / or MCB would have tripped.

 

[mwatsonxx]

I'm sure the RCD will have tripped by the time these live cables have bumped against the steel box enough to cut through the insulation

If that is your considered opinion you should not be carrying out electrical work. RCD's are not fitted to protect people from deliberately contrived dangerous situations. It's like saying you're not bothered about smashing your car into a brick wall because the airbags will protect you.

 

[mwatsonxx]

Grommet should be fitted

Another crap UK product, most grommets get dislodged during cable installation.

If the box became live when the face plate was in place then the RCD and / or MCB would have tripped.

If that is your considered opinion you should not be carrying out electrical work. RCD's are not fitted to protect people from deliberately contrived dangerous situations. It's like saying you're not bothered about smashing your car into a brick wall because the airbags will protect you.

 

[bernardgreen]

RCD's are not fitted to protect people from deliberately contrived dangerous situations.

The RCD and / or MCB would have tripped when the fault ( damaged insulation allowing conductor to touch metal back box ) happened. It wuld not wait until the face place was removed before the RCD and / or MCB tripped.

because the airbags will protect you.

Airbags do not protect legs from damage, hence sensible drivers avoid brick walls

 

[mwatsonxx]

It wuld not wait until the face place was removed before the RCD and / or MCB tripped.

So you're saying removing face plates does not disturb the attached wiring, eventhough you don't believe it.

 

[Iggifer]

Another crap UK product, most grommets get dislodged during cable installation

Don’t know what crap grommets you use but if you bought decent ones, then they wouldn’t. Never have a problem with the ones we buy falling out

 

[ban-all-sheds]

You'll believe a dog can fly.

 

[Iggifer]

View attachment 134815

You'll believe a dog can fly.

They are pretty super!