Guest RICHL Posted October 12, 2004 Posted October 12, 2004 Ive been looking for ages just to try and shut him up! but all Ive found is this: "cables used should conform with BS4737 : section 3.30 unless otherwise agreed" which is from 4.5.1 I dont have section 3.30 though
Brian c Posted October 12, 2004 Posted October 12, 2004 also alarm cable has a CSA of 0.2mm compared with 0.5mm of twisted pair. The twisting of the cables then adds additional CSA to the whole cable and alarm cable is more flexible and has a smaller bend radius If you don't know......ask.
ian.cant Posted October 12, 2004 Posted October 12, 2004 Ive been looking for ages just to try and shut him up! but all Ive found is this:"cables used should conform with BS4737 : section 3.30 unless otherwise agreed" which is from 4.5.1 I dont have section 3.30 though 27183[/snapback] Brian there is a spec for alarm cable, you would fail an inspection if you used GPO cable! Alarm Cable - 4 Core BS4737 Compliant Security Cable With strong nylon rip cord. Tinned and annealed copper 7 / 0.2 Copper , .22mm CSA Strong Plastic Drums Highest Grade Copper and PVC CE Marked
Brian c Posted October 12, 2004 Posted October 12, 2004 does this mean compliant cable should have a 'strong nylon ripcord'? As I have used so many cables with **** ripcords, it would be nice to get rid of them. What is strong judged as? Also, does this mean cables in cardboard(metal innard) drums are not compliant?? If you don't know......ask.
Brian c Posted October 12, 2004 Posted October 12, 2004 Brian there is a spec for alarm cable, you would fail an inspection if you used GPO cable! 27185[/snapback] Wasn't planning to, but you learn something new every day If you don't know......ask.
Guest RICHL Posted October 12, 2004 Posted October 12, 2004 Evening Ian, the plastic drum thing cant be right ?? its only packaging.
ian.cant Posted October 12, 2004 Posted October 12, 2004 does this mean compliant cable should have a 'strong nylon ripcord'?As I have used so many cables with **** ripcords, it would be nice to get rid of them. What is strong judged as? Also, does this mean cables in cardboard(metal innard) drums are not compliant?? 27186[/snapback] No! That was a spec of a suppliers cable.....as RichL has said i am frantically searching for BS 4737 section 3.30! BS 4737:Part 3:Section 3.30:1986 "Intruder alarm systems in buildings. Specifications for components. Specification for PVC insulated cables for interconnecting wiring" Materials and construction for cables forming the circuits connecting the components of intruder alarm systems.
Guest Posted October 13, 2004 Posted October 13, 2004 Georg, it is not because of regulations. It is the manufacturers that recommend using flexible multi-strand cable for thier equipment.It is also due to preference. Solid core twisted-pair cable is liable to snapping. 27181[/snapback] Dear Brian, CAT5 patch cable is not solid core. It is multi strand.
Guest Posted October 13, 2004 Posted October 13, 2004 also alarm cable has a CSA of 0.2mm compared with 0.5mm of twisted pair.The twisting of the cables then adds additional CSA to the whole cable and alarm cable is more flexible and has a smaller bend radius 27184[/snapback] ehh.. CSA?? (i don't understand) you have to remeber that cat5 bending radius is given so that 100Mb/s can still go through..
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