RCD tripping

[mick21]

HIall
called out to customer reporting rcd keeps tripping when they switch the landing light on.checked switches and ceiling rose,all in tact wiring ok ,replaced lamp etc. The light is two way and i have checked both switches,both ok. The cu is split load dual rcd and its tripping both rcds,any ideas please. thanks.

 

[claire_r]

sounds like a borrowed neutral?? when was this new 17th edition board put in?? has it been happening since then?

 

[solo2771]

sounds like a borrowed neutral?? when was this new 17th edition board put in?? has it been happening since then?

was going to say the same had same problem few weeks ago had to put both circuits on same rcd.

 

[claire_r]

yup thats the only way to get around it unless you want to rewire the lights!!

was going to say the same had same problem few weeks ago had to put both circuits on same rcd.

 

[mick21]

only been tripping since new cu was put in. thanks

 

[Guest123]

Deffo the curse of the borrowed neutral then.

Was a common wiring method back in the day.....our scourge in this day 'n' age.!!!

 

[m4tty]

Did you put the board in ?? or was it customer ?? and if it was the customer, how neat a job did he do ?? cheers

 

[mick21]

customer put cu in.did a good job actually everythin to 17th edition,i was quite surprised.

 

[Spudnik]

Certificate?

Test results?

 

[jimsky007]

Hi

Looks like he has put the supply for the lights (live) into one side of the board (RCD1) and the neutral into the N block for (RCD2)??

 

[glasgowspark]

yeah, that'll do it. RCDs work on imbalance between the L and N, so by sending them to opposite sides of the board youll get a trip. Put the N back on the correct busbar and all should be well.

 

[tomma]

Hi

Looks like he has put the supply for the lights (live) into one side of the board (RCD1) and the neutral into the N block for (RCD2)??

It's the simple things that you miss, well I did lol
Problem sorted Cheers jimsky007