breff Posted November 27, 2005 Share Posted November 27, 2005 Im with Allso on this one, I cant see how plastic can reduce a magnetic field, although Im sure your right on the standards Jef. Even in trunking ,I would keep them at least 6 inches apart unless its for a short run. The opinions I express are mine and are usually correct! (Except when I'm wrong)(which I'm not) Link to comment Share on other sites More sharing options...
jb-eye Posted November 27, 2005 Share Posted November 27, 2005 I share rjbsec's sceptical view on this one.It would defy the basic laws of physics for plastic trunking to remove the danger of induced AC voltages, no matter what any regulations might say! It's the magnetic fields around the AC cable that cause the induced voltages, and I can't see how plastic would protect alarm cables from this. Allso Yeah maybe. I sometimes think i know more than all the IEE and PHD guys that write those EN regs. regardless though you cant go wrong if you stick with the regs. You have me wondering now about those thousands of miles of data and control cable I Customers! Link to comment Share on other sites More sharing options...
Guest scottygio Posted November 29, 2005 Share Posted November 29, 2005 I want to thank all for their interesting input. I understand the importance of keeping the cables separate but in this case to get the cables upstairs i only have one route (about 2.5 metres). Once i get upstairs i can separate them. For the part where they are running together for 2.5 metres how would containing the alarm cables in kopex help? Kopex is flexible metallised conduit. Would this stop the induction and does anyone know the minimum distance required between mains and alarm cable? thanks again scott Link to comment Share on other sites More sharing options...
Adi Posted November 29, 2005 Share Posted November 29, 2005 I think the best thing is to install your cable and fit a filter if you get induced ac. Kopex could help but will need to earthed, seems alot of aggro. I really can't be ar**** with it anymore. Link to comment Share on other sites More sharing options...
Guest rjbsec Posted November 29, 2005 Share Posted November 29, 2005 I would still recommend screened cable - minimum distance quoted in the BS7671 referred to above is 50mm but the further apart you can make it the better. Link to comment Share on other sites More sharing options...
Adi Posted November 29, 2005 Share Posted November 29, 2005 Use screened alot easyer than faffing around with flexi. I really can't be ar**** with it anymore. Link to comment Share on other sites More sharing options...
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