If two PIR's are connected on the same 8 core cable, how are these wired up?
Given there are normally 6 cores to each PIR, how are two PIR's wired with
one 8 core cable?

Basically I think I have managed to put a screw through the return wires to
the panel. The PIR's are still getting power and the tamper circuit has not
been tripped. I spoke to the guy who commissioned the alarm (the builder
installed all the cables, he just connected the panel) and he said I could
take out the tamper circuit and swap the return wires with the tamper at
both ends. This will cure the problem, although I will no longer have the
tamper protection.

If 2 PIR's are on the one cable, are the tamper wires shared? If so, I don't
think I can do as he suggests??

In article ,
"diy-newby" writes:
If two PIR's are connected on the same 8 core cable, how are these wired up?
Given there are normally 6 cores to each PIR, how are two PIR's wired with
one 8 core cable?

Basically I think I have managed to put a screw through the return wires to
the panel. The PIR's are still getting power and the tamper circuit has not
been tripped. I spoke to the guy who commissioned the alarm (the builder
installed all the cables, he just connected the panel) and he said I could
take out the tamper circuit and swap the return wires with the tamper at
both ends. This will cure the problem, although I will no longer have the
tamper protection.

If 2 PIR's are on the one cable, are the tamper wires shared? If so, I don't
think I can do as he suggests??

It depends heavily on the type of panel, and the type of install
(sometimes internal detectors don't even get tamper protection
wired to them).

A common configuration is a single tamper loop in series through
all the detectors, so there will only be one pair in the cable
for it, regardless of the number of sensors/zones the cable splits
off to.

Sometimes there's no separate tamper circuit -- it's done with
single or dual end-of-line resistors on the zone circuits, so
the zone goes different resistances for OK, tripped, and tamper.

Most likely, you have the standard 6 cores you would get for one
PIR, and an additional pair for just the detector circuit on the
second PIR, assuming they are on separate zones (or panel inputs).

However, given the cable wasn't installed by the alarm installer,
the number of cores may not match actual usage by the alarm
installer.

Can you find where you put the screw through and repair it?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

"Andrew Gabriel" wrote in message
...
In article ,
"diy-newby" writes:
If two PIR's are connected on the same 8 core cable, how are these wired
up?
Given there are normally 6 cores to each PIR, how are two PIR's wired
with
one 8 core cable?

Basically I think I have managed to put a screw through the return wires
to
the panel. The PIR's are still getting power and the tamper circuit has
not
been tripped. I spoke to the guy who commissioned the alarm (the builder
installed all the cables, he just connected the panel) and he said I
could
take out the tamper circuit and swap the return wires with the tamper at
both ends. This will cure the problem, although I will no longer have the
tamper protection.

If 2 PIR's are on the one cable, are the tamper wires shared? If so, I
don't
think I can do as he suggests??

It depends heavily on the type of panel, and the type of install
(sometimes internal detectors don't even get tamper protection
wired to them).

A common configuration is a single tamper loop in series through
all the detectors, so there will only be one pair in the cable
for it, regardless of the number of sensors/zones the cable splits
off to.

Sometimes there's no separate tamper circuit -- it's done with
single or dual end-of-line resistors on the zone circuits, so
the zone goes different resistances for OK, tripped, and tamper.

Most likely, you have the standard 6 cores you would get for one
PIR, and an additional pair for just the detector circuit on the
second PIR, assuming they are on separate zones (or panel inputs).

However, given the cable wasn't installed by the alarm installer,
the number of cores may not match actual usage by the alarm
installer.

Can you find where you put the screw through and repair it?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]



Hi, thanks for the reply.

Can you find where you put the screw through and repair it?

I put in about a hundred screws in the upstairs landing due to loose /
squeaking floor boards