Honeywell LT-CABLE Posts

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Hi DIYers! Welcome to the first edition of Alarm Grid Tips! This is where we teach you basic principles about alarm systems. Most of these tips will be designed for beginners, so anyone can follow along! Today, we're going to show you why you should run a wire through the back of a panel.

Honeywell l5200 lynx touch wireless home security system and alarm control panel

One of the first things you will do when setting up an alarm system is power it on. This involves connecting a 2-conductor wire to the appropriate power terminals on the back of the panel. This is something you must do whether you are mounting the panel to the wall or using a desk mount to avoid drilling holes. The panel will ultimately receive its primary power from a plug-in transformer.

If you have a wireless system, you will want to run the unconnected power wire through the back plate before connecting it to the panel. This way, you can properly close the panel. If you try to connect the wire first, you will feel pretty silly when you have to disconnect the wire and then redo the same connections!

You can see this example below with a Honeywell L5200 System. First, let's see what happens if you don't run the wire through the back plate:



Now let's try again with the system wired correctly:



The principle is the same if you have a hardwired panel. These systems are normally housed inside a metal enclosure. You will want to run any connecting wires through one of the openings on the side or in the back. This way, you can properly close the metal cabinet door. You can see this on our Honeywell VISTA 21iP System below. Note that we removed the door for easy access, but we would be able to close it if it were still attached!


Also remember that you must follow proper polarity if your system is running DC power. The black wire will connect to the negative (-) terminals on the transformer and the panel. The red wire will connect to the positive (+) terminals on the transformer and the panel. If you are using AC power, then either wire can go to either terminal. Make sure you know whether your system uses AC or DC power before wiring!

Below is an example of DC transformer where proper polarity is followed:


That concludes today's Alarm Grid tip! Keep an eye on our blog for more tips in the future. We will also let you know if there's any important new security news. If you're an Alarm Grid customer in need of assistance, or if you are interested in an alarm monitoring plan, please reach out to us by emailing support@alarmgrid.com. You may also call us at (888) 818-7728 during our normal business hours of 9am to 8pm EST M-F. We look forward to hearing from you!

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Hi DIYers! Today, we'd like to discuss the Honeywell LT-Cable. This versatile cable makes is designed to replace a standard 18-gauge 2-conductor wire, and it makes it super easy to provide power to an alarm system. This makes it great for any DIY user who wants to set up their own panel.

Honeywell lt cable lynx touch power supply cable from aboveThe LT-Cable is eight feet long, and it does not require any stripping or splicing. It is pre-prepared and ready for action. The only tool that is needed when using an LT-Cable is a screwdriver. For that reason, it is perfect for end users who do not feel comfortable performing any advanced wiring. One end connects with the plug-in transformer, while the other end connects with the board on the security system.

The two ends of the LT-Cable meet through a plug-in barrel connection. If a user ever needs to power down their system, they can simply unplug the barrel connection to cut the power provided from the wall outlet. The LT-Cable can be used with both AC power and DC power. If using DC power, then proper polarity must be followed. The power cable works with virtually any alarm system that we offer, which includes systems that aren't manufactured by Honeywell.

The LT-Cable is available on the Alarm Grid website. Get one for your system now!

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As a DIY friendly company we love the Honeywell LT-Cable. For those who are not familiar with the cable it is a prefabricated power supply cable with male spade connectors and a right angle DC barrel plug. The spades offer a clean and easy connection to the screw terminals of your AC transformer. The barrel plug simply plugs into the DC port on the back of your alarm panel. The best part of the device is that it offers an easy way to power cycle your alarm system without dealing with the transformer. Generally the transformer is hidden or screwed into your wall plate so the LT-Cable offers a safe way to disconnect power from the panel without the hassle of the transformer. Now, technically you can disconnect hardwired power to the screw terminals if your system was custom cabled. However we strongly caution against that since you are dealing with live power with your transformer still plugged in. Although it is only low voltage power it can damage or destroy the panel or transformer if you accidentally short it.

As you may have seen in our Honeywell Lynx Touch videos the LT-Cable plugged directly into the DC port which was great. Well unfortunately Honeywell decided to phase out the DC port which we are bummed about. However they did do us a big favor by revamping it to have a pigtail with a DC port adapter. By doing this they essentially made the cable universal. In other words, the cable now can be used as a power connection to any alarm system. Here is why.

The pigtail has two wires on one end that should be landed on the AC or DC power connections of your alarm system. Not all systems have a DC port but they all have screw terminals for custom cabling. On the back side of the pigtail there is a female DC port. This is where the right angle male DC barrel connector plugs into. Instead of removing the male DC plug from the panel now you are removing it from the back end of the pigtail in order to power down. This means a clean, safe way to reboot your system...

By adding this pigtail, the cable will work with any alarm system you want. This is not just limited to wireless self-contained panels like the LYNX Touch. You can now use the LT-Cable to connect the transformer to your wired alarm control cabinets as well! Some panels may require low voltage AC power which does not have any polarity. However on most systems it is low voltage DC so be sure to match the red wire with your positive connection and black with negative.

As a DIY outfit we just wanted to share that this potentially bad news (Honeywell stripping out the DC port on the LYNX Touch panels) really turned into great news! We are now selling the new LT-Cable on our site. The cable is still in-wall rated and remains to be 8 feet long. The photo on the product page will be updated shortly. Check out the release note for a visual on the new cable.


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One of the problems with installing a system that has been designed to be put in by a professional is that sometimes, the company assumes you have certain tools that you probably don't have lying around. The L5100, our most popular wireless security system, for example comes with a 300-04705 transformer, but it doesn't come with any of the necessary wiring.

We do everything we can to explain in detail what's in each box we send, but sometimes, there is a little bit that gets lost in translation. So if you're getting ready to install a Honeywell L5100, we just wanted to make sure that you remembered to get the on thing that will save you from having to make a trip to a hardware store. The LT-Cable will make your installation a breeze, and you won't regret getting it.

In our installation video of the L5100, you can see just how much easier the LT Cable makes installation:



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Hey DIYers, it's Sterling here with my weekly column, "Ask Sterling." Every week I'll answer one of your questions and feature it here on the blog.

This week's question comes from John in Washington. John asked a basic, but important question, "How do you turn on a Honeywell L5100?"

Since the panel does not come with an easy power cable like the LT-CABLE by default, that's a solid question!

In the following video, I show John how to open the L5100 control panel and connect the LT-CABLE to the L5100. I also show how to connect the other end of the LT-CABLE to the LYNX Touch power supply.  Oh, and, of course, how to power it on!


Also, if you have any questions you'd like to see answered in Ask Sterling, ask below in the comments!

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