Re: Closed loop embedded in a concrete wall

[invalid@xxxxxxxxxxxx (Beachcomber)]

On Mon, 25 Dec 2006 10:03:25 GMT, Frank Olson
<Use_the_email_links@xxxxxxxxxxxxxxxxxxxxxx> wrote:

>Beachcomber wrote:
>> I will have access to a concrete foundation wall space before the pour
>> and I would like to embed a simple closed loop trip circuit to deter
>> against the remote possiblity of a break in from the basement.  (This
>> is a commercial installation.  The wall will be at least 8" thick and
>> have rebar inside for strength.
>>
>> What type of wire/cable would be best?
>>
>> Here are my concerns.
>>
>> I don't want to use bare copper in the concrete because of
>> oxidation/deterioration concerns and the possiblility of accidental
>> grounds.
>>
>> The wire or cable should be mechanically thick enough to last a long
>> time (many many years), but readily break if the wall is attacked with
>> drilling, sledge hammers, etc.
>>
>> What materials would be best for concrete?  Would you use a plastic or
>> metallic sheath? ...Possibly PVC?
>>
>> Any suggestions or advice would be greatly appreciated.
>>
>> Beachcomber
>>
>>
>>
>
>
>Yeah...  Vault vibration sensors spaced evenly around the perimeter.  If
>they do dig through the concrete and happen to "miss" your simple
>"sensor loop", you're gonna look like a "monkey".  I guess this place
>must contain the Crown Jewels, or Imelda Marcos's off-shore shoe collection.

Yeah...Well  Imelda loves her shoes  What can you do?

I looked into a Honeywell vibration detection system for vaults and
safes.  Expensive... but it does everything apparantly, detects
seismic disturbances, vibrations and explosions... even prints out a
log of events.

At the other end of the market are the cheapo vibration detectors that
require a pulse stretcher, made by Ademco, among others, I think..

I was just looking for some extra protection for the concrete wall...
sort of like a concealed screen.

Beachcomber