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The devices that will be used to trigger an event are sensors Conventionally, when thinking about home security we only consider motion detectors or window and door sensors However, in your Smart Home, you can connect all kinds of devices to your security system For instance, you can install a water sensor and place the sensor next to your sump If the water ever overflows onto your basement floor, the signal can be tripped and you can be made aware of the problem We ll talk about some specific types of sensors you can connect to your security system later in this chapter
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To connect your security system sensors to the control panel, you run a length of shielded, 4-wire, 22-gauge security cable This cable contains four wires, which is sufficient to connect most components of your security system Some devices (like open door/window sensors) will use two wires, while devices that require a power source (like a smoke detector or a motion detector) will use three or
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more wires The wires handle both the signals from the control panel and power The shielding is a protective layer that prevents interference from affecting the signal Figure 5-2 shows a close-up of the cabling and Figure 5-3 shows a 500-foot spool of the security cabling we used for our security system, obtained from a local home improvement store for about US$35
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Figure 5-2
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Four-wire, 22-gauge security cable
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Figure 5-3
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A 500-foot spool of security cabling
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If you are going to use components that require more wires, you can also opt to run 8-wire, 22-gauge security cable Installation Concerns Wiring for your various sensors and components are home-run from the control panel in your equipment room to the sensors, consoles, sirens, and so forth However, there are some considerations to be aware of when installing your security cabling First, be sure you select the most direct route between the equipment room and your sensors, being mindful of any obstacles For instance, will you need a few extra feet of cabling because you have to negotiate around a heating duct
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When you pull cable, make sure it s coming off the spool easily and not getting kinked or hung up on anything If you pull too hard, you ll be likely to damage the cabling; then, you ll wind up having to rerun the cabling If you are installing cabling in new construction, cable is pulled to each location by drilling a -inch diameter hole in the wall studs At this point, the cabling should also be secured to the studs so that it is not accidentally pulled out of the wall However, if you are retrofitting a completed home, it s easy enough to run your cabling through the basement or attic to your various locations Again, once the cabling has been placed, it is a good idea to anchor the cabling to a stud to avoid the wiring being yanked out of the wall (if possible without ripping out the drywall) Splicing When you connect your components to the cabling, there s no plug that makes for easy connectivity Rather, you ll have to splice your wires together An easy, common sense method for splicing wires is to trim back the insulation, twist them together, and wrap them with black electrical tape Regrettably, the fire marshal doesn t see it that way, and prefers a more urbane way to connect wires When connecting two lengths of cabling (maybe you ran out halfway through a run and had to reconnect) or a sensor or other component to a cable, the approved method is to use a butt connector These are small metal and plastic sleeves into which the two wires are inserted, then pinched down tight using a crimper Butt connectors are selected based on the gauge of the wire and usually come a dozen or so per package (though you can find them in many size packages) Take a look at Figure 5-4, which shows how wires are spliced properly
Figure 5-4
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