10v rcd backfeed?

[chrisreid186]

hi guys

if i test between live and neutral on a lighting circuit which is rcd protected and the mcb is off . why do i get about 10v on my volt tester? a mate said something about backfeed from the rcd? is this true if so can you explain why?

thanks in advance

 

[a.e.s]

It is probably just induced voltage from other circuits