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Do-It-Yourself (DIY) Question & Answer Forum
Shared Neutral (not borrowed) 3 phase
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<blockquote data-quote="phil d" data-source="post: 450324" data-attributes="member: 27126"><p>Personally I would take it as one circuit, therefore one neutral, however I must say that I think it's a very poor design.why use a 3p breaker to control 3 individual sockets? it's as bad as using one rcd to protect a whole board, if one socket takes a fault then it takes all of them out, very silly imo. Was it originally like this, or was it designed to supply something requiring TPN and it got reused, I wonder?</p><p></p><p>I remember one job many years ago in a training centre for electricians of all places, there was a single metalclad socket mounted directly below a db, someone had decided they needed another, so, rather than replace the single with a double, they attached another single below the first one using 2 bushes and a coupler, they extended the neutral and earth cables from the first socket, however for some inexplicable reason they thought it was a good idea to feed second socket off it's own fuse.</p><p></p><p>In the backbox for the first socket you had a red, a yellow, a black and a green/yellow, the red,black and g/y fed the first socket, Red was fed from a fuse on red phase in the db, the yellow fed the second socket, and was fed from a fuse on the yellow phase in the db! So you had 415v in the back of a backbox for a 13a socket outlet, not even a warning label,needless to say I removed it all and replaced the lot with one twin socket fed from one phase.</p></blockquote><p></p>
[QUOTE="phil d, post: 450324, member: 27126"] Personally I would take it as one circuit, therefore one neutral, however I must say that I think it's a very poor design.why use a 3p breaker to control 3 individual sockets? it's as bad as using one rcd to protect a whole board, if one socket takes a fault then it takes all of them out, very silly imo. Was it originally like this, or was it designed to supply something requiring TPN and it got reused, I wonder? I remember one job many years ago in a training centre for electricians of all places, there was a single metalclad socket mounted directly below a db, someone had decided they needed another, so, rather than replace the single with a double, they attached another single below the first one using 2 bushes and a coupler, they extended the neutral and earth cables from the first socket, however for some inexplicable reason they thought it was a good idea to feed second socket off it's own fuse. In the backbox for the first socket you had a red, a yellow, a black and a green/yellow, the red,black and g/y fed the first socket, Red was fed from a fuse on red phase in the db, the yellow fed the second socket, and was fed from a fuse on the yellow phase in the db! So you had 415v in the back of a backbox for a 13a socket outlet, not even a warning label,needless to say I removed it all and replaced the lot with one twin socket fed from one phase. [/QUOTE]
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