Rcd tripping times/ ramp test

[hoover]

What tripping time should I expect to be acceptable when doing a ramp test on both 30ma and 100ma rcds. I mean is 70ma tripping time on a 100ma rcd too sensitive?

 

[telectrix]

do you mean 70mA trip threshold? mA is not time!

70mA trip on a 100mA RCD is roughly same as 23mA on a 30. a bit low, but acceptable IMO.

 

[hoover]

Of course. Sorry excuse me. Not sure what I was thinking there.

 

[Deleted member 26818]

Is this an adjustable device?
Is it providing discrimination for another device in line?
What is the maximum disconnection time allowed?

 

[SimpleSimon]

Tripping times are in the appendix section of BS7671 u think.

Sent from my GT-I9100 using Tapatalk

 

[hoover]

Sorry I've got my question all wrong. What I meant to say was if I have a 100ma rated rcd tripping at 70ma would this be deemed too sensitive?

 

[tony mc]

No as it has passed as long as it does not trip out on half test !


Have a look at post 2 !


If you mean 70 ms well thats fine as well the quicker the better.

200 ms for BS RCD and 300 ms for ENBS RCD.

Hope that helps !