Signs of a Poor Cabling Installation

We all know the saying: “Cheap is expensive.” And nowhere is that more true than with network cabling. 

We get it—running a business isn’t cheap. So when it comes to infrastructure work like cabling, it’s tempting to cut corners or go with the lowest quote. But poor installation doesn’t just look bad—it costs you more in the long run. Fortunately, there are visible signs you can look for to spot a subpar cabling job before it turns into a serious problem. 

Here are the most common red flags. 

Messy Cable Runs 

Disorganized cables are more than just an eyesore—they can bring a whole host of problems. 

When cables are tangled, looped, or packed too tightly, they can cause electromagnetic interference (EMI) and crosstalk. Crosstalk occurs when signals from one cable interfere with another, leading to slow speeds, dropped packets, or even full connection loss. 

Poorly managed cables also lead to: 

• Overheating (especially in Power over Ethernet environments) 

• Physical stress on the cables, causing internal damage 

• Tripping hazards if they're left unsecured across walkways 

• Long troubleshooting times when you need to identify or trace a cable 

Neat cable runs with proper labeling and separation aren’t just for aesthetics—they’re essential for performance, safety, and maintenance.

Missing Junction Box Covers 

Exposed cabling and missing covers are clear signs of a rushed or careless install. Junction boxes are meant to protect connections from dust, physical damage, and interference. Leaving them uncovered not only violates safety standards, but also creates points of failure in your network. 

Cabling Attached to Gas Lines or Fire Suppression Pipes 

This is a huge no-go. Cabling should never be tie-wrapped to gas lines, water pipes, or fire suppression systems. Not only is this a code violation—it’s incredibly dangerous. If those lines need to be serviced or rupture, the cabling can obstruct access or even contribute to a hazard during emergencies. 

Using Indoor Cable Outdoors (and Vice Versa) 

Different environments require different types of cabling. Indoor cables are not built to withstand UV rays, moisture, or extreme temperatures. If used outdoors, the sheathing can break down, leading to exposure, corrosion, or complete failure. Outdoor cables are gel-filled or have a weatherproof jacket to resist these elements. 

At first glance, you might think outdoor cables—with their added durability—would be a great option for indoor use too. But that’s not the case. The protective materials used to make outdoor cables weather-resistant can actually become highly dangerous in the event of a fire. When burned, they release thick, black smoke that significantly reduces visibility—making it much harder to safely evacuate a building. In emergency situations, that lack of visibility can have fatal consequences.

Poorly Terminated Jacks and Panels 

A clean, functional install includes properly terminated jacks at wall plates, patch panels, or racks. If connectors are loose, hanging, or not properly seated, it’s a recipe for unstable connections, intermittent performance, and signal loss. 

Look for terminations that are: 

• Firmly snapped in 

• Neatly organized 

• Clearly labeled

• Fully seated with no exposed wires 

Overly Tight Zip Ties 

Using zip ties is standard—but overtightening them is a classic amateur mistake. Tight ties crush the cable jacket, potentially damaging the internal conductors and degrading performance. Good installers leave a little room for the cable to “breathe” without compromising organization. 

Unsupported Ceiling Runs 

Running cables through ceiling spaces is fine—if done correctly. Cables must be supported using trays, J-hooks, or other approved methods. Letting them drape across ceiling tiles or structural beams not only looks sloppy, it violates electrical and building codes and increases wear over time. 

Final Thoughts 

When it comes to your business infrastructure, it pays to do it right the first time. Poor cabling installation doesn't just cause minor hiccups—it leads to serious safety risks, costly downtime, and expensive rework. 

Whether you're moving into a new space or reviewing an existing setup, keep an eye out for these red flags. And remember: cheap is expensive—especially when it comes to the backbone of your network.