Service Engineer Posted March 19, 2005 Posted March 19, 2005 You mean door loops etc etc etc?Yeah ........................................................ Dave Partridge (Romec Service Engineer)
Guest Posted March 19, 2005 Posted March 19, 2005 Makes sense now - so ive been thrown by a previous mis-quote, arrrrrr - thank you grasshopper, I am now enlightened.
Guest Posted March 19, 2005 Posted March 19, 2005 They must have been piss-poor in the first place to have so many false alarms to start with 44791[/snapback] I don't know what cable they used, but i neverever have got a FA due to cable (and if it wasn't clear by now.. I use CAT3 single stranded ( MHS 3/5/10/20 pair x 0,5+0,5 (where 0,5 is diameter) ) ). THOU i know many systems that FA due to voltage loss in the cable when mains voltage drops. This thou doesn't have anything to do with cable but the installer who didn't count the power loss.
Guest Posted March 19, 2005 Posted March 19, 2005 I don't know what cable they used, but i neverever have got a FA due to cable (and if it wasn't clear by now.. I use CAT3 single stranded ( MHS 3/5/10/20 pair x 0,5+0,5 (where 0,5 is diameter) ) ). THOU i know many systems that FA due to voltage loss in the cable when mains voltage drops. This thou doesn't have anything to do with cable but the installer who didn't count the power loss. 44803[/snapback] My point exactly.
Guest Posted March 19, 2005 Posted March 19, 2005 My point exactly. 44804[/snapback] For petes sake stop agreeing with me all the time!!! Before we used to have nice , but now everyone (well, almost) agree with me.. Or then even I have learned something every day...
Guest Posted March 19, 2005 Posted March 19, 2005 For petes sake stop agreeing with me all the time!!! Before we used to have nice , but now everyone (well, almost) agree with me.. Or then even I have learned something every day... 44808[/snapback] -You learnt something? - dont push your luck!!
Guest Posted March 19, 2005 Posted March 19, 2005 -You learnt something? - dont push your luck!! 44811[/snapback] :lol:
ian.cant Posted March 19, 2005 Posted March 19, 2005 I've got to disagree here. Any CE marked equipment should have passed EMC compatibility tests, and many manufacturers exceed the CE requirements and quote the figures.Look at any Texecom spec sheet and you will see an RF Immunity rating. Their RF series PIRs are designed for nasty environments and have much higher immunity ratings. 44777[/snapback] As i said i wasnt aware of any manufactures, i didnt say there wasnt any! And if theyre kit is so good against rf why do they make a special rf immune sensors?
Guest rjenkins Posted March 19, 2005 Posted March 19, 2005 Oops, missed the 'flexible' bit, that does make sense. (But I don't think generic door flexes actually bother complying - the ones here, installed in 98 according to the paperwork, have cores no bigger than the basic alarm cable - certainly not 0.5mm2. The last time I had reason to cut one, admittedly many years ago, the cores were actually 'tinsel' wire like old phone flexible cables - possibly 0.1mm2 ?) Re. different RF immunity ratings, the basic stuff needs to be safe with 'environmental' RF like mobile phones, passing Taxis & PMR etc., where the high immunity stuff should still be OK near higher power installations like sites with transmitters. I'm getting the impression that 'Alarm' cable does not appear in a class of it's own due to any critical requirements, but because the BS specs for cable are so minimal that cables manufactured to (just) meet the spec are not actually fit for much else...
Guest Posted March 19, 2005 Posted March 19, 2005 Where does that leave single core phone cable then.... The debate goes on, we have people coming on here asking if they can wire an alarm with phone cable. For the cost of the alarm cable, I cant understand why you want to redesign something that aint broke - i.e. if it aint broke dont fix it.
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