InsecurelyAttached Posted October 31, 2013 Share Posted October 31, 2013 Hello all, I had to replace the battery on my Optima XM. Seems fine powered up, NVRAM retained the code and I have a 'day' LED on. However, to disconnect the mains I disconnected the 2 blue transformer wires from the mains terminal. Pic here: note 2 blue wires on left unconnected. Unfortunately the pic I took before disconnection is corrupt! I'm not sure which blue wire is +ve or -ve, or if it matters. Can anyone help? Thanks for your time, IA Link to comment Share on other sites More sharing options...
datadiffusion Posted October 31, 2013 Share Posted October 31, 2013 Better to just pull the internal or external fuse for functional isolation. Be very careful around mains electricity, if you are not a qualified electrician. If you don't want to use a professional, turn off the power at the mains, and connect the two blue wires either way round. There is no polarity for an AC transformer of this type. So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
matthew.brough Posted October 31, 2013 Share Posted October 31, 2013 It's AC so doesn't matter @DD beat me to it. www.securitywarehouse.co.uk/catalog/ Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted October 31, 2013 Share Posted October 31, 2013 Yeah, not really a good idea to remove those wires. A shock from any of them terminals could kill. Also noticed the panels earth wire is cut off which isn't good either, not to mention the missing tampers on the zones and bell... Link to comment Share on other sites More sharing options...
matthew.brough Posted October 31, 2013 Share Posted October 31, 2013 Yeah, not really a good idea to remove those wires. A shock from any of them terminals could kill. Also noticed the panels earth wire is cut off which isn't good either, not to mention the missing tampers on the zones and bell... Not going to win compliant panel of the year award . . . www.securitywarehouse.co.uk/catalog/ Link to comment Share on other sites More sharing options...
datadiffusion Posted October 31, 2013 Share Posted October 31, 2013 Not going to win compliant panel of the year award . . . Spotted, esp. tampers, but just thought, whats the point.... So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
matthew.brough Posted October 31, 2013 Share Posted October 31, 2013 Me 2 www.securitywarehouse.co.uk/catalog/ Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted October 31, 2013 Share Posted October 31, 2013 but just thought, whats the point.... Not offering to go around and fix it. However, most people don't even realise things are wrong/dangerous, so worth the mention. Link to comment Share on other sites More sharing options...
datadiffusion Posted October 31, 2013 Share Posted October 31, 2013 True, but if its a placcy case and OP doesn't know what they're doing, perhaps best left undisturbed Cable will still have cpc to point of entry, not how you or I would do it of course. So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
MrHappy Posted October 31, 2013 Share Posted October 31, 2013 Cable will still have cpc to point of entry, the ones I've found normally don't Mr Veritas God Link to comment Share on other sites More sharing options...
datadiffusion Posted October 31, 2013 Share Posted October 31, 2013 Spacker in, spacker out I suppose... So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
arfur mo Posted November 1, 2013 Share Posted November 1, 2013 Yeah, not really a good idea to remove those wires. A shock from any of them terminals could kill. Also noticed the panels earth wire is cut off which isn't good either, not to mention the missing tampers on the zones and bell... plastic case, so there is no onward connection of the earth wire after the fdu in the panel, so earth not being connected makes no difference, effectively a twin could be used.Not pretty, the earth wire seems cut short into the outer insulation, some insulating tape wrapped around it at least would not go amiss. this thread shows the need for a spur close to panel and properly marked up imho, but how often do you see it? If you think education is difficult, try being stupid!!!! Link to comment Share on other sites More sharing options...
sixwheeledbeast Posted November 1, 2013 Share Posted November 1, 2013 True, but if its a placcy case and OP doesn't know what they're doing, perhaps best left undisturbed Last time I checked a plastic case doesn't make an item Class II. There's an earth terminal there for a reason. Link to comment Share on other sites More sharing options...
sjsturner Posted November 1, 2013 Share Posted November 1, 2013 Last time I checked a plastic case doesn't make an item Class II. There's an earth terminal there for a reason. Not only that but the cable feeding it should have an 'earth' and not be just twin as arfur suggests. Link to comment Share on other sites More sharing options...
Rulland Posted November 1, 2013 Share Posted November 1, 2013 The 'earth' or cpc-circuit protective conductor, is there for a major reason, more so than the live conductors, ie live AND neutral, it does what it says on the tin, It protects the circuit, no matter wether its actually connected at the class two fitting/double insulated item or not, the earth of all three conductors is the most important for correct operation of protective devices-always carry it through in all wiring even if it's not required. Link to comment Share on other sites More sharing options...
datadiffusion Posted November 1, 2013 Share Posted November 1, 2013 Why are we all assuming it isn't connected at the FCU end (if its even got an FCU, mind)? There is clearly nothing connected to the other side of the earth terminal... so apart from bad practice, i.e. I would never terminate a cable in this manner even if it was double insulated,how is this going to benefit the installation? So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
Rulland Posted November 1, 2013 Share Posted November 1, 2013 DD my post wasn't intended to be a 'swipe' at anyone, purely suggesting that a 'cpc' be continued whether or not it is required by the final connected item. If the supplying cable is compromised, the earth provides the return path for fault current, and operates the protective device, it's not a guaranteed 'get out clause' but it's much better than no earthing at all. Link to comment Share on other sites More sharing options...
datadiffusion Posted November 1, 2013 Share Posted November 1, 2013 Totally agreed - and I'm sure it wasn't, my point was simply that encouraging tinkering with mains by suggesting a problem, is prob not a good move being the OP (presumably) isn't qualified. So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
sjsturner Posted November 1, 2013 Share Posted November 1, 2013 DD my post wasn't intended to be a 'swipe' at anyone, purely suggesting that a 'cpc' be continued whether or not it is required by the final connected item. . This is what my post was inferring also. Why are we all assuming it isn't connected at the FCU end (if its even got an FCU, mind)? There is clearly nothing connected to the other side of the earth terminal... so apart from bad practice, i.e. I would never terminate a cable in this manner even if it was double insulated, how is this going to benefit the installation? Does beg the question though, rough unterminated earth. Whats the supply end like? Link to comment Share on other sites More sharing options...
datadiffusion Posted November 2, 2013 Share Posted November 2, 2013 Again agreed, the lack of bell and device tamper gives a clue... So, I've decided to take my work back underground.... to stop it falling into the wrong hands Link to comment Share on other sites More sharing options...
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