Skip to content
Cutting Through Misconceptions
Saw-cut loops are a fundamental component of modern perimeter security and vehicle access control, serving as the silent sentinels that detect vehicles for automated gates, barriers, and bollards. Their reliability is critical; a system that fails to open for a valid vehicle or, worse, opens for an unauthorized one, creates a significant security risk.
Unfortunately, a great deal of misinformation exists regarding the proper installation, performance, and durability of these products. This can lead to costly system failures, frustrating false triggers, and a compromised security perimeter for gated communities, commercial properties, and other high-traffic environments.
Today’s blog post from All Security Equipment is dedicated to setting the record straight. We'll cut through the confusion surrounding saw-cut loops by addressing five common misconceptions and debunking them with hard facts. The goal is to empower property managers, business security managers, and security professionals with the correct knowledge, ensuring your vehicle detection and access control systems are installed correctly and perform exactly as they should. We’ll also be highlighting one of our most trusted loop brands in our catalogue.
Common Misconceptions About Saw-Cut Loops
Myth 1: You cannot splice a saw-cut loop's wires.
This misconception often deters installers from making necessary repairs or adjustments, leading to unnecessary full replacements. The belief that any splice will cause a loop to fail stems from the fact that a faulty connection is indeed a major point of failure. However, this myth overlooks the specific techniques and materials required for a reliable splice.
In a professional loop installation, installers must sometimes add length to a damaged lead-in wire, and this myth causes them to believe that the only solution is to start over entirely, leading to wasted time and increased costs on the job site for property managers and business security managers.
Fact 1: A splice is acceptable if executed correctly.
The fact is, a splice in a saw-cut loop's lead-in wire is completely acceptable if it meets two critical conditions: it must be electrically sound and watertight. The most reliable method is to solder the wires, as this creates a strong, corrosion-resistant connection. The connection must then be sealed with a watertight splice kit. Neglecting these steps and using temporary fixes like electrical tape will undoubtedly lead to failure. By following these straightforward rules, security professionals can confidently perform repairs, ensuring the vehicle detection system remains reliable and functional for gated communities and commercial properties.
Myth 2: Loop lead-in wires must be twisted to "cancel" the field.
A pervasive myth in access control is that the lead-in wires connecting a saw-cut loop to the detector must be twisted a specific number of times per foot. The belief is that untwisted wires will cause false detections, mistakenly sensing the movement of an automated gate or a metal object passing above them. This misconception arose from troubleshooting flawed installations and mistakenly attributing the problem to the untwisted wire, rather than the true underlying mechanical or sealant issues. This misinformation complicates an otherwise simple process, adding unnecessary steps for installers.
Fact 2: Twisting is a symptom of a good installation, not the cause of reliability.
The real cause of false detections from untwisted lead-ins is not a "canceled field" but rather the minute movement of unencapsulated wires. When a saw-cut groove is too narrow, sealant cannot flow properly, leaving air pockets that allow the wires to vibrate from ground tremors or gate movement. The action of twisting the wires simply helps keep them secured together, reducing their movement and preventing false detections.
Myth 3: A narrow 1/8" saw-cut groove is sufficient for a reliable loop.
Many installers prefer using a narrow 1/8" saw-cut blade because it is less expensive and faster to cut. This practice is based on the flawed assumption that a narrower groove saves time and material, without compromising the integrity of the loop installation.
However, this is a significant myth with real consequences. Cutting a groove too narrow is a leading cause of premature loop failure and intermittent problems that can plague a vehicle detection system, leading to frustrating and costly repeat service calls for property managers and business security managers.
Fact 3: A groove of 3/16" or wider is essential for proper sealant and longevity.
The fact is that a narrow 1/8" groove does not allow sufficient space for loop sealant to properly flow around the wires and encapsulate them. This creates air pockets, which as mentioned before, allow the wires to move and cause false detections. The optimal groove size is 3/16" or wider.
Myth 4: The saw-cut groove must be an exact size for a preformed loop to fit.
Some installers believe that using a preformed saw-cut loop requires the groove to be cut to an exact, precise size for the loop to fit correctly. The thinking is that if the groove is even slightly off, the loop will be difficult to install, potentially causing it to not sit properly or be damaged during installation. This misconception can deter security professionals from adopting preformed loops, leading them to waste valuable time and resources hand-wrapping loops on-site, a practice that is far less reliable and efficient.
Fact 4: A preformed loop with a "Y" yoke design offers flexible sizing.
The truth is that a preformed loop with a "Y" yoke design is quite flexible in size. While you cannot make a loop larger than its manufactured size, the "Y" yoke allows you to make it smaller. By pulling excess loop into the lead-in run, you can easily adjust the loop to fit a groove that is slightly smaller than the loop itself.
This innovative design ensures that the preformed loop will fit every time, as long as the groove is not too large, making installation quick, easy, and reliable for vehicle detection systems.
Myth 5: Any standard electrical wire is suitable for a saw-cut loop.
Many rookie or DIY installers mistakenly believe that standard electrical wires, such as TFFN or THHN, are acceptable for saw-cut loops. This myth is often perpetuated by a desire to use readily available, low-cost materials. However, these wires are designed for indoor use within conduit, not for direct burial in harsh outdoor environments.
The consequences of using improper wire types can be frustrating and difficult to diagnose, leading to repeat service calls for issues that seem to appear and disappear, causing major headaches for property managers and business security managers.
Fact 5: Specialized wire insulation is necessary for durability and reliability.
The fact is that standard electrical wire is a poor choice for saw-cut loops. The insulation on these wires absorbs water, breaks down in hot weather, and is easily nicked during installation, leading to intermittent failures that often coincide with rain or temperature fluctuations. The best wire options for loop installation use XLPE (Cross-linked polyethylene) insulation, which is highly resistant to water, heat, and abrasions.
Brand Highlight - National Loops: The Professional's Choice
When seeking a reliable solution for vehicle detection, National Loops stands out as a premier American-made manufacturer with over 20 years of experience. Based in New York, the company has built its reputation on supplying high-quality saw-cut loops, surface-mounted, and direct burial products that are installed in thousands of locations across the country, from airports to gated communities.
The engineering behind National Loops directly addresses and resolves the common myths surrounding saw-cut loops. Unlike unreliable hand-wrapped wires, their preformed loops feature machine-twisted, continuous polypropylene-wrapped wires that eliminate the risk of wire movement and false detections.
Their non-spliced design and use of robust materials mean their products are built with the corrected facts in mind, preventing the intermittent failures caused by poor splices or improper wire types. By choosing National Loops, security professionals can ensure their access control systems are built with long-term reliability and efficiency from the ground up, avoiding costly service calls and security risks.
When it comes to building a truly reliable vehicle detection system based on these facts, National Loops stands as the definitive professional's choice, meanwhile, to ensure your loop installation is flawless and your security system is built for a lifetime, the All Security Equipment customer service team is the option for expert guidance!
