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Two ring mains in a room
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<blockquote data-quote="SPECIAL LOCATION" data-source="post: 551740" data-attributes="member: 250"><p>From a safety point of view anyone who assumes anything is isolated without checking first is not competent enough to be working with an invisible substance that can kill a healthy adult in less than a second. </p><p></p><p>It is about as logical as not looking before you cross a road, because the previous road you crossed had no traffic! </p><p></p><p>The only assumption you can make from a safety point of view, is that everything is still connected and live until you have proved it to be isolated. </p><p></p><p>Even if there is just one socket circuit, what if the switch / MCB used for isolating is faulty and has not disconnected the source of power? Or if the MCB labels are incorrect and a 32A cooker & 32A socket ring are swapped? Or the wiring has been crossed between two MCBs? Or borrowed neutral issues..?</p><p></p><p>Although they may sound unusual.. be assured incorrect label identification, faulty switches can and do happen more often than I would like them too, and I have seen a single ring with each end connected onto different MCBs, and conservatory lights with Live feed from the lighting circuit and neutral tapped into the sockets as they was no neutral at the switch they extended from! etc.. </p><p></p><p>Always test and re-check before touching anything that could be live!!</p></blockquote><p></p>
[QUOTE="SPECIAL LOCATION, post: 551740, member: 250"] From a safety point of view anyone who assumes anything is isolated without checking first is not competent enough to be working with an invisible substance that can kill a healthy adult in less than a second. It is about as logical as not looking before you cross a road, because the previous road you crossed had no traffic! The only assumption you can make from a safety point of view, is that everything is still connected and live until you have proved it to be isolated. Even if there is just one socket circuit, what if the switch / MCB used for isolating is faulty and has not disconnected the source of power? Or if the MCB labels are incorrect and a 32A cooker & 32A socket ring are swapped? Or the wiring has been crossed between two MCBs? Or borrowed neutral issues..? Although they may sound unusual.. be assured incorrect label identification, faulty switches can and do happen more often than I would like them too, and I have seen a single ring with each end connected onto different MCBs, and conservatory lights with Live feed from the lighting circuit and neutral tapped into the sockets as they was no neutral at the switch they extended from! etc.. Always test and re-check before touching anything that could be live!! [/QUOTE]
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Two ring mains in a room
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