Re: Tamper Contacts

["Crash Gordon" <webmaster@xxxxxxxxxxxxxxxxxxxxx>]

There are easier ways to disable a pir...and thats why I like to use
anti-masking pirs.
Sorry, OP...for some reason I thought you were talking about a residential
system.

"Frank Olson" <Please-use-the-email-links@xxxxxxxxxxxxxxxxxxxxxx> wrote in
message news:uLl4f.199011$oW2.183322@xxxxxxxxxxx
|
| "Will" <DELETE_westes@xxxxxxxxxxxxxxxxxx> wrote in message
| news:3vKdnTovqc_aQ8zeRVn-rA@xxxxxxxxxxxxxxx
| > We are commercial not residential.  I'm inferring this from your
| > description:  the purpose of the tamper is to determine if someone has
cut
| > wires while the alarm system is disabled?
|
| That's only part of the reason to use it.  A dishonest employee could very
| easily remove the cover from a motion sensor and wad it with toilet paper
| (I've seen that done) so it won't sense anything.  In this instance,
| employing the tamper would alert the CS who would in turn notify the
| customer.
|
|
| >
| > If someone cuts the wire without the tamper wire in place, won't the
panel
| > sense this by some other means?
|
| Sometimes.  If, for instance, end-of-line resistors are properly placed
(at
| the motion sensor for instance), then either a "fault" or "trouble" will
| show up at the keypad preventing the end-user from arming the system until
| the problem is repaired.  If, in the process of cutting the wire, the
power
| supply is also shorted out, then all the keypads in the system will become
| inactive and a call for service will go out to the installing company.
| However, if end-of-line resistors aren't used and the power supply is only
| momentarily shorted (the panel employs MOV's or an automatically
resettable
| circuit breaker), then you could wind up with a short across the alarm
| terminals.  The panel would never "see" an alarm from that zone and you
| would have no way of determining at the keypad that something was amiss.
|
|
| > On an Ademco 128BP, there would be no
| > message on the panel?
|
| Depends.  See above.
|
|
| >
| > What if someone cuts the wire while the system is enabled?   Does tamper
| > help in this case?
|
| If they happen to "cut the wire" on a system that doesn't employ properly
| installed end-of-lines, and they happen to also *short* the alarm
terminals
| at the same time (or within the pre-determined alarm time threshold which
is
| usually in milli-seconds), then you're "SOL".  Chances are though, that if
| someone deliberately cuts the wire on an *armed* system, the siren's going
| to be going (unelss the zone's bypassed).
|
| Bottom line - On commercial installations always use end-of-line
resistors.
| Use door and window contacts with built-in end-of-lines of the correct
value
| for the panel (these can be ordered through most alarm companies).  And
| *always* utilize devices with built in tampers.
|
|
|