Neutral earth fault

[james the spark]

I swapped a db on a job yesterday and there is a fault on the heating circuit and i just cant find it in the most disgusting house you have ever seen what is the deal with putting it on the non rcd side? can i do it

 

[Octopus]

Need more information mate.

 

[tony mc]

You need to find the fault.


What sort of reading are you getting on IR ?

 

[james the spark]

its feeding an old immersion tank and two sockets in the bedroom havent done IR as it would mean rooting about in the bedroom having to unplug everything and i have to make clear how manky this house is but it isnt tripping it straight away some times it will stay on for two min some times a hour so im guessing its only tripping under load

 

[Octopus]

its feeding an old immersion tank and two sockets in the bedroom havent done IR as it would mean rooting about in the bedroom having to unplug everything and i have to make clear how manky this house is but it isnt tripping it straight away some times it will stay on for two min some times a hour so im guessing its only tripping under load

So you've changed a CU, not done a IR, not unplugged everything and wonder why its tripping???

 

[james the spark]

i knew there was a fault when i put the board in all i want to know is can i put it on non rcd and note it on the test sheet

 

[tony mc]

Im affraid your asking for trouble doing that.

 

[james the spark]

thought as much cheers

 

[Octopus]

I wouldn't. My CU change estimates include a caveat about faults discovered during the change and additional charges being made.

How are you going to complete the EIC if you haven't tested that circuit properly. You know its the immersion and sockets so that's half the discovery done

 

[tony mc]

No BS 7671 does not have anything in about faulted circuits being place on non RCD protected side Im affraid !

 

[Octopus]

You originally said "heating" and now its immersion - if its the latter I'd be looking at the connections at the immersion first.

 

[telectrix]

first thing is to diss. the imm. heater, either by switching off the FCU if it'd D/P, or diss. the cable from the heater. that is the most likely culprit for your fault--the immersion heater element.

 

[Shropshire]

Yeah disconnect the element from the supply and try IR between L-N and N-E if eaither are short theb that's mostly your problem. You'll get dead shhort between L-N but you knew that anyway

 

[IzzyS]

Yeah disconnect the element from the supply and try IR between L-N and N-E if eaither are short theb that's mostly your problem. You'll get dead shhort between L-N but you knew that anyway

You will get an IR reading of 0.00 M ohms. That's not a dead short, otherwise it would have gone BANG by now...

 

[thekingiam]

just wondering what the op was going to do filling in eic without doing ir tests,make them up?