add new door magnet alarm / sensor

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  #1  
Old 08-01-16, 01:04 PM
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add new door magnet alarm / sensor

I need to add a new magnet / door alarm sensor for a new door.
The existing wire seems to be a 4 colour wire, is this telephone wire?
Seems to be called Canada Wire 08 CSA Type ZSW FT1
but I can't find much information about it.
The wire goes into a control box, which is then connected to the control panel.
I will then phone the alarm company to configure it all up at their central system.

[ATTACH=CONFIG]69063[/ATTACH]
 
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  #2  
Old 08-01-16, 04:24 PM
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22 gauge 4-conductor cable used to be the telephone wire standard prior to Cat 5/6 wire. Because it was so readily available, it's also the default standard wire for security system installation.

Essentially, you are connecting a magnetically actuated switch. You could use speaker wire, for all that the circuit cares.
 
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Old 08-02-16, 08:08 AM
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Why 4 wires though? Are you saying just 1 wire is necessary?
So, basically it's the same as telephone wire?
Any differences in guage that I need to use for an alarm system?
 
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Old 08-02-16, 09:13 AM
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You only need two of the wires, but most companies ran "quad"(4-wire) cable because, as Ron said, it was so readily available and also having some spare wires sometimes saved a lot of grief if one got severed.

I worked with a few small companies that used "mini-zip" 2-wire that was more easily damaged and the long-term cost of having to re-run damaged wire probably cost more overall than running quad. It only takes one wire damage re-run incident to eat the savings of many many cheap 2-wire runs--labor is the big expense in using hardwire, not materials.

As for wire gauge, 22 gauge is way overkill electrically---it only needs to carry a few miliamps at most and the smallest gauge you can is probably sufficient. However, I stay with at least 24 AWG for the physical strenth. Any smaller would be too easy to break in those moments when you need to tug on them or work with them, e.g. handling splices and securing at screw terminals.

I recommend buying a screw-terminal type sensor for your door. It costs a tad more, but is worth it to save the hassle of splicing lead-in wires, plus one less thing (splices) to go wrong.
 
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Old 08-02-16, 10:15 AM
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I assume the connection into the alarm box has a space for each cable linked to a zone.
Can these magnets be had from hardware stores, I've never seen them.
 
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Old 08-02-16, 04:10 PM
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I'd look online for the sensor. There's different styles, 2 piece recessed goes in the latch side or top of the door, plunger/button style goes in the hinge side of the door, or surface mount that goes on the frame and door it's visible all the time.
 
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Old 08-03-16, 02:35 AM
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Websearch using the phrase "security door/window contact". Buy the one that's on sale, or that you like the look of. Standard contacts are essentially commodity items.
 
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