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Fish tape is a flexible, steel wire that can be threaded through a wall or floor When the tape comes through the other end of the wall or floor, the cable to be run is attached to the tape, then retracted back through the wall This sounds simple enough, but lining up the fish tape so it comes out in the desired location is part skill, part art form, and part luck
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Protecting your cabling is also an important consideration Not only does locating it in the wall keep it from being an eyesore, it won t get tripped on, nor will the family dog chew through it Protection is also important for cabling that s been placed out of sight If you locate your cabling near electrical wires or other sources of interference, it s a good idea to buy shielded security cabling Frankly, shielded cabling only costs a little more (if at all) than unshielded, so you should probably get that anyway Generally, avoid running security cable next to power cabling to avoid interference If you must, make sure you cross electrical cabling at 90-degree angles Testing Before connecting your system sensors to the control panel, it s a good idea to test the cable for shorts, ground faults, and opens Testing is performed after the cabling has been pulled and checks for any damage that might have occurred during installation There are two ways to check the integrity of your cabling:
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Continuity The first test requires that you twist the ends of two
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sets of wires together For instance, in the security cable we pulled, there are red, white, green, and black wires To perform the continuity test, twist the red and white wires together, then twist the green and black wires together (as shown in Figure 5-15) Next, connect a multimeter to the wires on the other end of the cable run Select the 0 to 100 ohms resistance range, then place one test lead on each conductor at the end of the cabling A reading of more than 28 ohms per 100 feet of cable indicates that there is damaged cabling
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A multimeter can be picked up at home improvement or electronics shops for less than US$20
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Figure 5-15
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Continuity testing
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Battery The more popular method for checking the integrity of
cabling is to connect a 9-volt battery to the cable, using alligator clips Then, using the multimeter, set the detector to a DC voltage of 20V Measure the voltage coming out of the battery for a baseline reading (it s rare that the voltage will be precisely 9V) Next, place one test lead on each conductor end, then measure the voltage If the voltage difference is more than 5V for every 100 feet, the cable is damaged or defective Figure 5-16 illustrates this The battery method tends to be the more popular, chiefly because the ends of the cabling need not be twisted together
Security Basics
Figure 5-16
Battery testing
Don t Do this
As with any trade, installers have their own shortcuts that have developed over time One such shortcut eliminates the multimeter from the battery method Instead, installers simply touch the ends of cable to their tongues Naturally, we re not endorsing this method (not only is it unsafe, but how can they tell the difference between 65V and 83V ), but as soon as you heard that a 9V battery was used, this possibility had to have popped into your mind Now that you know the cast of characters for home security systems, turn the page to 6 and we ll start drilling holes in things (including a very expensive maple floor!), pulling cable through them, and connecting wire after wire after wire
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Did you analyze your points of entry and danger zones Did you figure out which types of sensors you ll need in
various locations
Did you measure your cabling runs on a home diagram Did you perform a reality check, planning around obstacles,
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