split board test rcd b rcd a trips

[silver]

installed a spilt board today 5 on one side 5 on other,made sure the cct did not get mixed ,start testing rdc b side first mainly because they are all radials cct, did loop on no trip rcd a tripped out but got the readings on rcd b why

 

[Octopus]

Borrowed neutral?

What dead tests did you do?

 

[silver]

with the cct on b side they were original heating cct on their own board and changed to single sockets which is know in a spilt board all socket were tested on their own ie line 1 and earth getting R1R2 readings ok

 

[silver]

but i will double check tomorrow ,i have been wrong before ask my wife

 

[smuggler]

check the your consumer unit tails from main N and from RCD to N bars