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| Mains sockets with no earth |
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| james_s:
--- Quote from: themadhippy on January 18, 2021, 12:59:59 pm --- --- Quote ---You still have RCD protection without an earth. --- End quote --- if you dont have an earth your rcd will not work.were does the fault current go as there is no path for it to travel.Dont believe me then remove your main incoming earth and bonding and short earth to live or neutral somewhere on the consumers side and see how long it takes for the rcd to trip --- End quote --- Sure it will. The ground wire in a GFCI/RCD passes straight through and does not connect to any of the active circuitry. Neutral is tied to earth somewhere in the domestic wiring system of every developed nation as far as I'm aware, and the GFCI works by detecting an imbalance between live and neutral current which indicates a leakage path. Since neutral is bonded to earth somewhere, the live is always referenced to earth whether you've got a safety earth or not. |
| JohnnyMalaria:
--- Quote from: james_s on January 18, 2021, 11:51:46 pm --- --- Quote from: themadhippy on January 18, 2021, 12:59:59 pm --- --- Quote ---You still have RCD protection without an earth. --- End quote --- if you dont have an earth your rcd will not work.were does the fault current go as there is no path for it to travel.Dont believe me then remove your main incoming earth and bonding and short earth to live or neutral somewhere on the consumers side and see how long it takes for the rcd to trip --- End quote --- Sure it will. The ground wire in a GFCI/RCD passes straight through and does not connect to any of the active circuitry. Neutral is tied to earth somewhere in the domestic wiring system of every developed nation as far as I'm aware, and the GFCI works by detecting an imbalance between live and neutral current which indicates a leakage path. Since neutral is bonded to earth somewhere, the live is always referenced to earth whether you've got a safety earth or not. --- End quote --- Earthing arrangements vary significantly across the - well - earth. https://en.wikipedia.org/wiki/Earthing_system I find it very disturbing that predominantly North American advice is being given for a situation using a different earthing system. Before modifying any electrical wiring in a country you aren't familiar with, educate yourself. I moved to the US from the UK. The electrical systems are utterly different. If I started (re)wiring something in a US house using my UK understanding of electricity, I'd probably be either (i) dead or (ii) in prison for killing someone. |
| bdunham7:
--- Quote ---I find it very disturbing that predominantly North American advice is being given for a situation using a different earthing system. Before modifying any electrical wiring in a country you aren't familiar with, educate yourself. I moved to the US from the UK. The electrical systems are utterly different. If I started (re)wiring something in a US house using my UK understanding of electricity, I'd probably be either (i) dead or (ii) in prison for killing someone. --- End quote --- The OP is in Japan. Split-phase, likely what you would call 'TT' earthing. RCD (not really a 'North American' term) is highly appropriate and effective. For some reason the US system seems hard to understand for those who haven't seen it. OTOH, I have no problem understanding other systems in theory--including India, Japan and continental Europe with their need for two-pole appliance switches--I do find the actual installations in the UK to be a bit odd. But none of it should be all that hard theoretically, at least in a home installation. The specifics just take a bit of study. |
| amyk:
Oddly enough, the first thing I thought of when I read the title was "Japan"... As far as I know, they are the newest country to still have predominantly ungrounded outlets. They are also the only country to have "metric" mains voltage. :D |
| themadhippy:
--- Quote ---Sure it will --- End quote --- so if we don't need an earth why don't we use an rcd on the secondary of an isolating transformer?after all thats a circuit without an earth --- Quote ---Neutral is tied to earth somewhere in the domestic wiring system of every developed nation as far as I'm aware --- End quote --- not on the consumers side,otherwise your rcd/gfi would be permanently tripped |
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