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Just Moved And Learned What A Tt Earth Is, Some Questions!
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<blockquote data-quote="Lurch" data-source="post: 403462" data-attributes="member: 6967"><p>This is where I start to lose interest in it, it doesn't make sense to apply the ruling to consumer units blindly.</p><p></p><p>A 1 way consumer unit with a 6A MCB feeding a light in a garage. This CU is fed from the main CU by a 1.5mm² SWA on a 10A MCB - garage CU has to be non-combustible</p><p></p><p>A rotary isolator in a garage fed by a 16mm² T&amp;E supplying an electric boiler - isolator doesn't need to be non-combustible as it isn't a CU.</p><p></p><p>I know we are supposed to follow the rules no matter what, it is quite hard to at times though.</p><p></p><p>I think there is some misunderstanding somewhere, the RCD won't trip if the earth becomes live.</p><p></p><p>The DNO fuse should blow if the phase conductor of the tails from the meter to CU should come into contact with an earthed component.</p><p></p><p>You can secure the tails in such a way that contact would be near impossible.</p><p></p><p>I have never seen live tails "fall out" of a main switch for no reason without anyone touching them.</p><p></p><p>Regular testing and inspection should show up any issues with loose tails that are about to fall out and hit the case.</p></blockquote><p></p>
[QUOTE="Lurch, post: 403462, member: 6967"] This is where I start to lose interest in it, it doesn't make sense to apply the ruling to consumer units blindly. A 1 way consumer unit with a 6A MCB feeding a light in a garage. This CU is fed from the main CU by a 1.5mm² SWA on a 10A MCB - garage CU has to be non-combustible A rotary isolator in a garage fed by a 16mm² T&E supplying an electric boiler - isolator doesn't need to be non-combustible as it isn't a CU. I know we are supposed to follow the rules no matter what, it is quite hard to at times though. I think there is some misunderstanding somewhere, the RCD won't trip if the earth becomes live. The DNO fuse should blow if the phase conductor of the tails from the meter to CU should come into contact with an earthed component. You can secure the tails in such a way that contact would be near impossible. I have never seen live tails "fall out" of a main switch for no reason without anyone touching them. Regular testing and inspection should show up any issues with loose tails that are about to fall out and hit the case. [/QUOTE]
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Just Moved And Learned What A Tt Earth Is, Some Questions!
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