- Reaction score
- 55
Hi all.
Been bugging me.
I think there is a way to calculate how fast a particularly rated RCD should trip (rather than measuring) but I can't remember how to do it ?
e. g. If I was designing an SWA submain fed from a TT earthed installation and I needed to install say a 300mA TD RCD to acheive a disconnection time of 1sec for fault protection, is there a way to calculate at the design stage whether that RCD will trip within 1sec ( if I know the rated time delay) ?
Been bugging me.
I think there is a way to calculate how fast a particularly rated RCD should trip (rather than measuring) but I can't remember how to do it ?
e. g. If I was designing an SWA submain fed from a TT earthed installation and I needed to install say a 300mA TD RCD to acheive a disconnection time of 1sec for fault protection, is there a way to calculate at the design stage whether that RCD will trip within 1sec ( if I know the rated time delay) ?