RCD's

[Tencho1234]

Hi people,

Can any tell me what would make an RCD take a long time to disconnect, i understand they monitor the line and netural wires but what would make them take a long time to disconnect or not even trip when testing.

Many Thanks.

 

[telectrix]

faulty RCD or, if the test button has not been preseed for a long time, might get stuck.

 

[Tencho1234]

What if they were brand new and there was two! lol they have been installed in an old house. they have updated the distrubution board all works fine but when i tested the RCD's i get a reading of >400ms. and it dosent trip.

 

[telectrix]

try switching all the breakers off then test at the RCD load side terminals