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Do-It-Yourself (DIY) Question & Answer Forum
Twin Mains supply to double socket socket
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<blockquote data-quote="Speed" data-source="post: 521317" data-attributes="member: 33225"><p>I have seen many broken wires (without them being twisted) in socket-outlet terminals from over tightening of screws. Even some where the terminate screw is on the insulation and not the copper, because not twisted together. In addition, copper eventually deforms under the terminal screw pressure and can become loose. So you first get a high resistance connection, which eventually breaks the ring if the wires not twisted. This is why regular testing recommended, not to fine dangerous DIY mods, but to discover high resistance faults from time passing. However, before twisting, the practise was not to even cut the cable at all, but strip the insulation and fold the bare copper into terminal. So ring was only ever physically broken at the fuseboard. The only reason I can see for not twisting together. Is to keep Testers happy when testing rings, but they are usually not 'Approved Electricians' or 'Electrical Technicians' who should understand the danger. This seems a poor reason for risking the danger of a broken ring. The whole theory behind a final ring circuit is that it cannot be physically broken.</p><p></p><p>As for the question about rewiring after multiply eicrs. As I previously stated, good practise is to have enough spare wire in box to double back twice before terminating. How many times you planning to change socket fronts?</p></blockquote><p></p>
[QUOTE="Speed, post: 521317, member: 33225"] I have seen many broken wires (without them being twisted) in socket-outlet terminals from over tightening of screws. Even some where the terminate screw is on the insulation and not the copper, because not twisted together. In addition, copper eventually deforms under the terminal screw pressure and can become loose. So you first get a high resistance connection, which eventually breaks the ring if the wires not twisted. This is why regular testing recommended, not to fine dangerous DIY mods, but to discover high resistance faults from time passing. However, before twisting, the practise was not to even cut the cable at all, but strip the insulation and fold the bare copper into terminal. So ring was only ever physically broken at the fuseboard. The only reason I can see for not twisting together. Is to keep Testers happy when testing rings, but they are usually not 'Approved Electricians' or 'Electrical Technicians' who should understand the danger. This seems a poor reason for risking the danger of a broken ring. The whole theory behind a final ring circuit is that it cannot be physically broken. As for the question about rewiring after multiply eicrs. As I previously stated, good practise is to have enough spare wire in box to double back twice before terminating. How many times you planning to change socket fronts? [/QUOTE]
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Twin Mains supply to double socket socket
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