When it comes to building a strong, reliable IT infrastructure, network cabling is the unsung hero. It forms the physical backbone that connects all your computers, servers, phones, security systems, and other networked devices. High-quality cabling ensures fast communication, minimal interference, and smooth data transfer across your entire system. Yet despite its critical role, it’s often overlooked during planning and implementation. A single mistake in cabling design or installation—such as poor layout, improper termination, or using the wrong cable type—can lead to frustrating issues like inconsistent connectivity, data loss, or full network outages.
Here are the most common network cabling mistakes to avoid.
1. Poor Planning and Lack of Documentation
The Problem:
Many businesses rush into network cabling projects without a clear plan. They run cables wherever space allows, skip labeling, and fail to document port locations or cable paths. While this might seem efficient in the short term, it causes massive confusion during maintenance, upgrades, or troubleshooting.
How to Avoid It:
Start with a thorough network design that outlines exactly where each device will be connected and where cables should be routed. This includes mapping out rack locations, switch placements, wall jacks, patch panels, and cable paths. Once installed, label both ends of every cable clearly using a consistent naming convention. Maintain detailed documentation—including diagrams, port maps, and color codes—for all cable runs, which will simplify future upgrades and service calls.
2. Poor Cable Management
The Problem:
When cables are bundled loosely, draped across floors, or stuffed behind furniture, it becomes difficult to trace lines or identify problems. Over time, poorly managed cables can become tangled, pinched, or physically damaged, leading to signal loss and network instability.
How to Avoid It:
Use structured cable management tools such as vertical and horizontal cable managers, ladder racks, raceways, and Velcro ties. Avoid using zip ties, which can pinch cables and degrade performance. Separate cables by function and keep power and data cables routed independently. Neat and organized cabling not only looks professional but also enhances airflow, simplifies maintenance, and reduces the risk of accidental disconnections.
3. Using Incompatible or Low-Quality Cables
The Problem:
Trying to save money by using cheap cables or mixing different cable categories (such as Cat5e with Cat6 or Cat6a) can severely compromise your network’s reliability and speed. This issue becomes especially apparent when you’re dealing with high-bandwidth tasks like video conferencing, VoIP, or cloud computing.
How to Avoid It:
Choose only high-quality, certified cables from reputable manufacturers. Stick with one category throughout each section of your network to ensure consistent performance. If you’re installing new infrastructure, opt for at least Cat6a cabling to accommodate current and future data needs. It’s also crucial to ensure all components—patch panels, jacks, connectors—match the cable type to prevent bottlenecks or compatibility issues.
4. Running Data Cables Too Close to Electrical Lines
The Problem:
Data cables running parallel and in close proximity to power cables are exposed to electromagnetic interference (EMI), which can cause packet loss, data corruption, and slow connections.
How to Avoid It:
Maintain a minimum distance of 12 inches between network and electrical wiring. If your cabling must cross power lines, do so at a 90-degree angle to minimize EMI. In environments where separation is difficult, consider using shielded twisted pair (STP) cables or installing cables inside metal conduits to reduce interference. Proper cable routing during installation is critical to long-term network health.
5. Exceeding Maximum Cable Lengths
The Problem:
Ethernet standards define a maximum cable length of 100 meters (about 328 feet). Exceeding this distance can result in signal degradation, increased latency, and dropped connections—especially for high-speed applications.
How to Avoid It:
Measure all cable runs in advance to stay within the recommended distance. If your layout requires longer spans, use intermediate network devices such as switches or signal boosters to regenerate the signal. For even longer distances, consider transitioning to fiber optic cabling, which supports significantly greater lengths without loss of performance.
6. Skipping Post-Installation Testing
The Problem:
Some installers assume the network is fine as long as devices appear to connect. However, small issues like wiring errors, intermittent faults, or poor terminations can remain hidden until they cause major disruptions.
How to Avoid It:
Always perform full cable testing after installation using a professional cable tester. Verify for continuity, correct pairings, signal strength, and proper terminations. Document the results for future reference. Thorough testing helps ensure that your network infrastructure is truly ready to support business operations with no hidden vulnerabilities.
7. Not Following TIA/EIA Standards
The Problem:
Ignoring industry standards—like TIA/EIA-568—results in installations that may work temporarily but fail to meet performance or safety requirements. It also creates challenges when integrating with other systems or passing compliance inspections.
How to Avoid It:
Work with technicians who are trained and certified in structured cabling standards. Follow best practices for color codes, terminations, cable types, and pathway design. Adhere to T568A or T568B wiring configurations consistently throughout your network. Compliant installations not only perform better but also simplify future upgrades and ensure compatibility across equipment.
8. Ignoring Environmental Factors
The Problem:
Cables that are run through hot, wet, or high-interference areas degrade faster and are more likely to fail. Environmental exposure can also void warranties and violate building codes.
How to Avoid It:
Evaluate the physical environment before installation. Use plenum-rated cables in HVAC spaces, and outdoor-rated cables for exterior runs. Avoid sharp edges, high temperatures, and areas with frequent vibrations or moisture. In harsh conditions, install conduit or armored cables for added protection. A well-considered installation will ensure your cabling stands up to its surroundings.
9. Overfilling Conduits and Cable Trays
The Problem:
Trying to stuff too many cables into a tray or conduit not only causes physical damage to the wires but also limits airflow and complicates future additions or repairs. It can also lead to signal interference and network downtime.
How to Avoid It:
Respect fill ratios as defined by industry standards. Leave at least 25–30% of space in trays or conduits for future expansion. Segment cables by purpose (voice, data, video) and use dividers when needed. Taking time to properly plan and space your cable runs improves long-term reliability and maintenance efficiency.
10. Attempting DIY Installation Without Expertise
The Problem:
Cabling may seem simple, but poor installation can cause major business interruptions. DIY jobs often result in mixed categories, loose terminations, unlabeled cables, and hidden errors that disrupt workflows.
How to Avoid It:
Hire a professional structured cabling provider with real-world experience. Certified installers understand how to route, label, test, and document network cabling correctly. They also ensure compliance with local codes and industry standards, while providing warranties and post-installation support. Investing in professional installation today prevents costly problems tomorrow.
Get Structured Cabling Done Right—With Reliable Telecom
Avoiding these common cabling mistakes requires experience, planning, and attention to detail—qualities that Reliable Telecom brings to every project. From small offices to multi-floor commercial buildings, we provide expertly planned and installed structured cabling solutions that support faster speeds, better uptime, and future scalability.
We take the guesswork out of network infrastructure and ensure your system is built to last.
Ready to upgrade or install your network the right way?
Contact Reliable Telecom today:
Phone: (772) 233-4404
Email: help@reliable-telecom.net
