OP
Engineer54
The RCD is operating intermittently; these devices are very reliable
You wouldn't be saying that if you had seen the sheer numbers of RCD devices of all kinds being returned to the manufacture for replacement on my last and previous projects!! That's the problem, many think they are very reliable, when in fact they are nowhere near as reliable as many make them out to be. That goes for all types of RCD and all manufacturers even the top end ones. You only have to just look at the amount of posts on the forum threads, where RCD failures have been highlighted!! lol!!