Matthew Pennington Posted November 26, 2013 Share Posted November 26, 2013 Hi There, Can anyone explain AC Bleed to me? Is it something I need to test for in a maintenance and if so how? Also what parameters are acceptable and how do I ensure I am within these parameters Any help on this matter would be greatly appreciated. Many thanks Matt Link to comment Share on other sites More sharing options...
garsec Posted November 26, 2013 Share Posted November 26, 2013 AC bleed (inductance ?) in what regards cctv or intruder, if your looking fo inductance in alarm wiring, you need to measure between +12v and mains earth on a 20v ac setting, anything above 1vac is a potential for trouble Employed by an NSI GOLD company Any comments or views i have are my own, and do not represent that of my employer or clients. Link to comment Share on other sites More sharing options...
Matthew Pennington Posted November 27, 2013 Author Share Posted November 27, 2013 Brilliant, thank you, I am sure I was told about this some years ago as an engineer as I knew how to measure it but didn't know the parameters. Now I am starting out on my own I am trying to pick up as many things as I can. Again thanks for the reply Matt Link to comment Share on other sites More sharing options...
lamplight73 Posted December 3, 2013 Share Posted December 3, 2013 I would measure it as a standard on maintenance visits. High induced ac, usually caused by low voltage ( alarm) cables run parallel with mains 240v could cause random false alarms. ACT suggest fitting a 1313 filter on every panel/ psu inducing 1vac or more. If money were no object I would fit one on every end station, but I generally fit one if the induced is 12v or more and they have had a history of random ( multiple ccts) false alarms. Usually fitting one at the end station brings down the induced at the psu's anyway. I have had panels though that have been in for years, no false alarms whatsoever, and 50/ 60vac induced, go figure Mark Link to comment Share on other sites More sharing options...
matthew.brough Posted December 3, 2013 Share Posted December 3, 2013 Act (who make filters) recommend fitting a filter with each system. Can't think why? www.securitywarehouse.co.uk/catalog/ Link to comment Share on other sites More sharing options...
Adi Posted December 4, 2013 Share Posted December 4, 2013 ive got a **** load of systems at well over 1v, with no issues, id only fit a filter if i had issues, most panels will sit there happy. I really can't be ar**** with it anymore. Link to comment Share on other sites More sharing options...
lamplight73 Posted December 4, 2013 Share Posted December 4, 2013 as above... Link to comment Share on other sites More sharing options...
datadiffusion Posted December 4, 2013 Share Posted December 4, 2013 Took out an old Menvier the other day and found comment in log from 1998 or something about 'mains float'. They had noted they'd wired panel 0V to earth to correct? (which was still there). TS700 I think, very odd panel in that the transformer itself was actually on the PCB rather than in the chassis. 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...
garsec Posted December 4, 2013 Share Posted December 4, 2013 ah the old grey panels with the big yellow sticker on the board lol, i havent seen that done before, but i have seen all spare cores of cct wiring taken down to mains stud in panel to make a drain for inductance Employed by an NSI GOLD company Any comments or views i have are my own, and do not represent that of my employer or clients. Link to comment Share on other sites More sharing options...
datadiffusion Posted December 5, 2013 Share Posted December 5, 2013 Must have been advanced for its time I suppose, tons of 'till roll' in the panel, guessing a printer had been used at each service. 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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