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

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

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

Edited October 12, 200421 yr by ian.cant

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??

Edited October 12, 200421 yr by Brian c

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

Evening Ian, the plastic drum thing cant be right ?? its only packaging.

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.

Edited October 12, 200421 yr by ian.cant

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.

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..

also GPO doesn't tell me anything