Post B8jjR0R6Hd9anYf0qm by wolf480pl@mstdn.io
 (DIR) More posts by wolf480pl@mstdn.io
 (DIR) Post #B8jX6yehzjc82Ci0SO by wolf480pl@mstdn.io
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       irregular reminder to press the "TEST" button on your RCDEDIT: Ideally at a time when you don't mind a power outage. The RCD is supposed to shut off power when you press TEST.
       
 (DIR) Post #B8jiyYtT5lhvGiMlA8 by FoxVK@mastodon.sandwich.net
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       @wolf480pl wondering will is break using test button is someone clever connected N with PE after then  RCD?
       
 (DIR) Post #B8jjR0R6Hd9anYf0qm by wolf480pl@mstdn.io
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       @FoxVK dependsIf PEN splits into PE and N before RCD, and then these two wires are connected again after RCD, then it should trip all the time. Like, you shouldn't be able to turn it on when there's any load at all, because ~half of the return current goes not-through-the-RCD.If "PE" after RCD is only connected to N after RCD, and not to PE before RCD, then the test button should trip the RCD, but a leakage to chassis won't trip the RCD, which is bad.I'm not a certified electrician btw.1/
       
 (DIR) Post #B8jjipN4A5Uxh2GtTU by wolf480pl@mstdn.io
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       @FoxVK There's also a third scenario, which is the TT layout: there's no PE or PEN coming from the grid, so PE is not connected to N before the RCD. It's only connected to a ground electrode.In that case, if someone connected PE to N after the RCD, the TEST button should still trip the RCD, but depending on weather, the RCD may not work, or it may trip all the time.Basically what the test button does is it connects a resistor between L-after-RCD and N-before-RCD (or vice versa)2/2
       
 (DIR) Post #B8jkdhdHbbYeCOydHc by FoxVK@mastodon.sandwich.net
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       @wolf480pl That is a good point. One of my home owners was about to do that with led light. (it was double insulated so there was no PE screw) but I managed to tlak him to not do that after some time :D
       
 (DIR) Post #B8jkkuKylfW3d4qpJQ by wolf480pl@mstdn.io
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       @FoxVK all I said above was deduced from the little schematics they draw on RCDs, high-school level physics, and the wikipedia article on grounding systems (TN-C vs TN-S vs TT)
       
 (DIR) Post #B8jl7B5p9SxXxzNivA by wolf480pl@mstdn.io
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       @FoxVK waitwas the light a portable device with a 2-prong plug?Did it have exposed metal elements that he was trying to connect to N?
       
 (DIR) Post #B8jlMVvlxWzEwCzcmm by FoxVK@mastodon.sandwich.net
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       @wolf480pl I don;t remember. there were just two terminals. I think he confused it with opposite situation -> when you have two wires and light has three terminals...
       
 (DIR) Post #B8jlQy35MKpZIoXMVE by wolf480pl@mstdn.io
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       @FoxVK oh, the light fixture had 2 terminals and he wanted to jam both N and PE under one screw?YIKES
       
 (DIR) Post #B8jlUnrHBmner6qI8e by wolf480pl@mstdn.io
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       @FoxVK although this would've probably tripped the RCD immediately
       
 (DIR) Post #B8joMU4HBWiH1TeDo0 by anymouse_404@glitch.social
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       @wolf480pl Fun fact I've learned recently: The manufacturers generally specify something like "must be tested every month" or something unrealistic like that, and it's apparently really common for the mechanism to get a bit seized if not exercised regularly, so that the button won't flip it, but if you flip it off and on few times manually, it will start working again.
       
 (DIR) Post #B8joa9aU7ykXYeEP6O by wolf480pl@mstdn.io
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       @anymouse_404 electricians test it?What's next, giving you a measurement certificate with PE-to-earth resistance, insulation resistance short loop impedance, and breaker actuation times?