rcd tripping after smoke alarm fitted.

[DC-backfrom the past]

Just a reminder on IR testing - Aico installation instructions specifically warn not to do it with units connected. Likewise accidentally making the interconnecting link wire live will trash them, if I recall correctly.

I completed the ir testing with the cables unconnected from the smoke alarms. (the alarms were still in the box)Sad as it seems I actually tested each cable rather than link( R1-R2)as I had a new wander lead and it was a flat I was in.

 

[westward10]

So is the original circuit still in place and your new circuit is paralleled at the mcb?

 

[Octopus]

You need an earth leakage clamp meter ......

 

[DC-backfrom the past]

So is the original circuit still in place and your new circuit is paralleled at the mcb?

Original cable which is direct from mcb was taken out from first smoke Alarm and is used as the live/ neutral /Earth supply in the loft void.
the interconnecting cables (three core and earth) for the alarms are linked in to this feed .
I will draw a diagram as I realise this explanation might not be clear

thanks for the help folks

 

[Octopus]

EDIT: If it trips when you attach the smoke alarm - did you use the existing bases or fit new ones?

 

[DC-backfrom the past]

EDIT: If it trips when you attach the smoke alarm - did you use the existing bases or fit new ones?

I tried it with brand new base and new alarm and it still trips. I stripped back the circuit to the original cable and new base /alarm and it still trips (ie back to original state). To say I am demented is an understatement. I appreciate that its hard to advise without being there.
I just wondered if I was missing something glaringly obvious

 

[Wilko]

I tried it with brand new base and new alarm and it still trips. I stripped back the circuit to the original cable and new base /alarm ... To say I am demented is an understatement ... I just wondered if I was missing something glaringly obvious

Glass of favourite and the installation instructions, who knows? I've had domestic blindness more than once

 

[Pete999]

I tried it with brand new base and new alarm and it still trips. I stripped back the circuit to the original cable and new base /alarm and it still trips (ie back to original state). To say I am demented is an understatement. I appreciate that its hard to advise without being there.
I just wondered if I was missing something glaringly obvious

Swap the N over to the other Nbar

 

[DC-backfrom the past]

Swap the N over to the other Nbar

to the one covered by the other rcd ?

 

[Pete999]

to the one covered by the other rcd ?

Yep