On Mon, 28 May 2012 22:25:15 +0100, Dave Liquorice
wrote:

On Mon, 28 May 2012 20:00:48 +0100, Jim K wrote:

low voltage PIR? what from where?

As used with intruder alarm systems. Many to choose from...

including ones rated for exterior usage?

a normal 240v PIR and some sort of a relay?

Some 240v PIRs operate relays rather than being solid state. Wether
the relay contacts are "volt free" is another matter...

precisement - which "some" are those though?

Jim K