Immersion tripping RCD

[Pete123a]

Hi Thanks again for the help.

Yes, cable changed for new one and also run off a nearby but on separate MCB ring main and same problem.

Insulation and resistance of the new heater seems OK, but only measured with a standard type multi meter.

Next step is to try disconnecting some neutrals as well as switching off the MCB to the other circuits to see what occurs. Well let you know!
Cheers Pete

 

[EFLImpudence]

Yes, cable changed for new one and also run off a nearby but on separate MCB ring main and same problem.

Did you mean separate RCD?

Next step is to try disconnecting some neutrals

Ok.

as well as switching off the MCB to the other circuits to see what occurs.

Switching off MCBs will make no difference.

 

[Pete123a]

Hi,only thought I'd switch off the MCB AND disconnect the neutral to each circuit in turn, to completely isolate it.

Is this correct?

Cheers Pete

 

[EFLImpudence]

Hi,only thought I'd switch off the MCB AND disconnect the neutral to each circuit in turn, to completely isolate it.

Yes, sorry. I misread the 'try disconnecting some neutrals as well as switching off the MCB to the other circuits'.

 

[Pete123a]

Hi, no problem, I appreciate all the help in getting.

Pete

 

[Pete123a]

I managed to get a couple of hours today, so had another try.

I disconnected all the neutrals bar the immersion and switched off all MCBs bar the immersion. Guess what still the same! So I tried a new length of 2.5mm twin and earth laid down the hall. Yep still the same.

So a new immersion heater and new RCD are on order. Also a new switch, as in checking all the connections were tight I seared the head off one of the screws!

I figure now that the heater must be at fault.....we will see!

Cheers Pete

 

[HERTS P&D]

Do you have a multi meter, you can test immersions.


Andy

 

[Pete123a]

Hi Andy, yes I have tested with good but basic multi meter, no connection between the neutral and earth or live and earth. 19 ohms on the element, which I think is about right.

So with my basic tools it would seem OK and it is a brand new Tesla Titanium unit. Getting a new one as I really don’t know what else to try!

Cheers Pete

 

[Pete123a]

Hi, just to let you know that I fitted a replacement heater today. Exactly the same model as the first one. Yes it worked perfectly!

So the first new one must have been faulty, even through it tested OK with a basic multi meter.

So, thanks to everyone for their comments, the help was appreciated.

Pete