"dennis@home" wrote in message
...
On 07/05/2018 11:29, Rod Speed wrote:


"ARW" wrote in message
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On 06/05/2018 20:37, Rod Speed wrote:


"ARW" wrote in message
...
On 06/05/2018 14:08, dennis@home wrote:
On 06/05/2018 13:44, ARW wrote:
On 05/05/2018 23:05, dennis@home wrote:
On 05/05/2018 17:54, ARW wrote:


They can use EOL if they want. The first thing to disable is the
bell box. Five minutes job done and the ladders are back on the
van.


Taking the cover off mine will sound the alarm in both bell boxes.
They probably think one is a dummy so will not be prepared.

They probably won't cut the phone either.

Most bell boxes sound if you remove the cover, hence you use other
methods to disable them than do not involve removing the cover.


foam is a bit hit and miss especially with double skinned bell boxes.
Most people probably wont know if its double skinned or not.

there are other methods but they are all a bit hit and miss.

When I was working for Chubb I used to run a thin wire around the
inside of the box and connect it to the tamper circuit. Not standard
but it was easy to do. Then there was a good chance that they would
set the alarm off if they drilled it.

These days you can just put a vibration sensor inside as they are
cheap and fairly reliable.


Of course no alarm will put junkies off.

I know of one burglary where two yobs kicked a gate in, went in the
back garden and picked up a bench which they threw though the patio
doors and went in and took the TV. All while the dogs were barking,
the alarm going off and the owners in bed upstairs.



You are talking ********.

Which particular bit is absolute ******** ?

It must be possible to ensure that no one can
get into the box without setting the alarm off.

It is possible, but no one does it.

Why not ? It cant be that expensive to do.

Its always going to be too expensive to cover everything.

Nope, potting it and including a vibration
sensor covers everything and isnt expensive.

You could fit a light sensor inside the box so they have to work in the
dark if they open it.

And you could have a vibration sensor so they couldnt
open it in the dark and have it potted so there would
be nothing useful they could do by opening it anyway.

Or you could put a piece of glass in there with a LED at 45 degrees at one
end and a sensor the other. the light would get to the end by multiple
internal reflections and if the glass was broken, removed, tilted or made
wet the beam would break and the alarm would go off. The wet bit is how
car rain sensors work AIUI.

Its not a commercially viable product as nobody would pay the extra.

But they would with it potted with a built in vibration sensor.

And trivial to add a vibration sensor and to fill it with foam if no
manufacturer has enough of a clue to do it right in the first place.