fused spur and faults

[lockhes]

hi everyone

if i had a fault on an outside socket and the fused spur was switched off inside what controls outside socket would it still trip the rcd

hope that makes sense

 

[eddielarge]

Reading back over everything, I'm beginning to think I might have got hold of the wrong end of the stick with regards what was being asked.

I was thinking more in single circuit scenario - where if the MCB is off - that circuit is dead and can't possibly trip an RCD.

it's clearer now that in certain circumstances a neutral/earth fault could cause a problem for the whole installation.

That's the good thing about these discussions - it gets you thinking

exactly what this site is all about

 

[chris gray]

correct

correct

 

[Jason Smith]

Not a chance! You need a circuit for current to flow to your outside socket - with line disconnected (switched off) you have no circuit, so no current



This, also, would not happen

Oh yes it would. Well remember learning this one, switched offthe lighting circuit so I could chop a cable leaving the vet downstairs to carry on submitting his online annual accounts..........

 

[Davey101]

Yep, sorry mate, but a neutral fault will usually trip an RCD, whether the mcb is on or not. In my time, I've cut plenty of T+E's without thinking, causing the main RCD to trip.
More reading needed

 

[Jason Smith]

sorry wayne, did not read your reply before writing mine. I was taught the only time it wont happen is when there is no load on the board, i.e no circuits drawing currents at all.

 

[WayneL]

sorry wayne, did not read your reply before writing mine. I was taught the only time it wont happen is when there is no load on the board, i.e no circuits drawing currents at all.

Hi mate,

Yeh, that's the basis I was working on - total isolation - got me thinking though, so it was good