Crabtree Grid Switch

[irishsailor]

Lads

trying to connect a 2 way lighting circuit. Previous electrician clearly had no 3 core and used 2x T&E. It's is a Crabtree grid switch with L, L1 & L2. I have belled out ends and know what's what. But when connecting the RCD is tripping out.

Any ideas

cheers

 

[LankyWill]

If its 2 way it might be connected to another lighting circuit on opposite breaker. which will cause an imbalance or you have belled out a neutral wrong.