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I wouldn't live in a house without one of those RCD's I don't think. I've tripped ours off a couple of times, pond pump and forgotten what else now.
But I'm not the best when it comes to power safety. Ran my observatory off a 80m extention cord for several years. That tripped the fuse a few times (not RCD) due to over-draw. I now have the 21 power points in the observatory split in to 2 seperate RCD devices, it's just what the electrician did, not something I thought of.
I've never had a problem with power boards exposed to dew, and haven't ever tripped off the RCD's in the observatory.
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