For decades, galvanized steel armor and aluminum interlocked armor raceways have been the default choice for industrial wiring. However, as project budgets tighten and construction timelines shrink, more electrical contractors and project owners are questioning whether this traditional method still delivers the best value. This article provides a data-driven comparison between exposed run cable (specifically UL1277 certified TC-ER cable) and traditional raceway systems, helping you make the right decision for your next industrial project.
1. The Hidden Costs of Traditional Raceway Wiring
While raceway systems are familiar to most electricians, their true costs extend far beyond the initial material purchase:
· Excessive labor requirements: Installing raceways involves cutting, bending, threading, and connecting hundreds of individual pieces. A typical run requires many hours of skilled labor, not including pulling the THHN/THWN-2 or XHHW-2 conductors inside.
· Material waste: Raceway systems generate significant scrap from cut pieces and unused fittings, adding a substantial percentage to material costs.
· Extended project timelines: Raceway installation is often on the critical path of construction projects. Delays in electrical work can push back entire facility openings.
· Limited flexibility: Once installed, raceways are difficult to modify. Adding a new circuit or reconfiguring equipment requires cutting into existing raceways or installing entirely new ones.
These hidden costs make traditional raceway systems significantly more expensive than they initially appear, especially for large-scale industrial projects.
2. TC-ER Exposed Run Cable: A Code-Compliant Alternative
Many contractors still believe that exposed wiring is not allowed in industrial settings. However, NEC Article 336.10(7) explicitly permits TC-ER cable (Tray Cable-Exposed Run) to be installed directly without additional raceway protection in industrial applications.
UL1277 certified TC-ER cable is specifically engineered for exposed installations:
· Heavy-duty PVC jacket provides excellent mechanical protection against abrasion and impact
· Integrated bare ground or insulated green ground conductor eliminates the need for separate grounding wires
· Available in multiple configurations including 3/C TC-ER cable, 4/C TC-ER cable, 5/C TC-ER cable, and 7/C TC-ER cable for power and control applications
· Rated for 600V applications, suitable for most industrial power distribution needs
This code-compliant solution has been widely adopted in North America and Europe, with proven performance in thousands of industrial facilities.
3. Head-to-Head Comparison: Cost, Time and Performance
When comparing total installed costs, TC-ER exposed run cable consistently outperforms traditional raceway systems by a significant margin. Traditional systems require purchasing both the raceway materials and the individual conductors inside, leading to much higher overall material expenses. When combined with the far greater labor requirements of cutting, bending and assembling raceways, TC-ER cable delivers total cost savings of 30%-50% for most industrial installations.
In terms of project timelines, the difference is even more dramatic. A typical run that would take multiple days to complete with traditional raceways can be finished in a fraction of the time with exposed run cable. Overall construction periods for electrical work can be shortened by more than 60%, allowing projects to move forward faster and facilities to begin operations sooner.
The advantages continue long after installation is complete. Traditional raceway systems make maintenance and circuit modifications extremely difficult and time-consuming. Adding a new circuit or reconfiguring equipment requires extensive work to access and modify existing raceways. With exposed run tray cable, these same modifications can be completed in a small fraction of the time, minimizing downtime for your operations.
· Performance and Safety Comparison
Contrary to common misconceptions, exposed run tray cable provides the same level of safety protection as traditional raceway systems:
Both systems meet the same NEC safety requirements
TC-ER cable passes the same flame tests as raceway-enclosed conductors
The heavy-duty PVC jacket protects conductors from physical damage
Integrated grounding ensures reliable electrical safety
For instrumentation applications, instrumentation TC-ER cable provides additional shielding against electromagnetic interference, making it ideal for control and signal circuits.
4. When to Choose Exposed Run Cable (and When Not To)
· Ideal Applications for Exposed Run Cable
New industrial plant wiring
Old plant electrical renovation and upgrades
Warehouse and logistics center power distribution
Manufacturing production lines
Commercial building mechanical rooms
· When Traditional Raceways May Still Be Appropriate
High pedestrian traffic areas below 7 feet (additional protection required)
Areas with extreme mechanical abuse potential
Certain hazardous locations (check specific NEC requirements)
Architectural applications where aesthetics are a primary concern
5. Key Compliance Guidelines for Exposed Run Installations
To ensure your exposed run installation complies with NEC and local codes:
· Verify local code variations: While NEC Article 336 allows exposed runs, some local jurisdictions may have additional requirements. Always check with your local electrical inspector before starting work.
· Follow installation height requirements: Exposed run cables installed below 7 feet must be protected from physical damage.
· Maintain proper support spacing: TC-ER cable must be supported at specified intervals for both horizontal and vertical runs.
· Use only UL1277 and UL44 certified cable: Only cables with both certifications are approved for exposed run installations.
· Document everything: Keep records of cable certifications and inspection reports for compliance purposes.
6. Frequently Asked Questions
Q: Is exposed run cable more expensive than raceway systems?
A: No. As shown in our comparison, TC-ER exposed run cable saves 30-50% of total installed costs compared to traditional raceway systems.
Q: Will insurance companies cover installations using exposed run cable?
A: Yes, as long as the installation complies with NEC Article 336 and local electrical codes.
Q: Can exposed run cable be used outdoors?
A: Yes, sunlight-resistant TC-ER cable is approved for outdoor exposed installations.
Q: What is the maximum voltage rating for TC-ER exposed run cable?
A: Standard TC-ER cable is rated for 600V, with 1000V options available for higher voltage applications.
7. Request a Free Project Assessment
With over 20 years of experience manufacturing UL1277 and UL44 certified TC-ER cables, we can help you determine if exposed run wiring is the right choice for your project. Contact us today for a free cost comparison analysis tailored to your specific application. Our team of electrical experts will provide you with detailed information for 3/C TC-ER cable, 4/C TC-ER cable, and any other configuration you need.
Dongguan Greater Wire & Cable Co., Ltd.
Tel/WhatsApp/Wechat: +86 136 6257 9592
Tel/WhatsApp/Wechat: +86 135 1078 4550
Email: manager01@greaterwire.com
Website: www.greaterwire.com