Cable Tray Installation in Refineries - Mistakes & How to Avoid
Cable trays don't get much credit. They're tucked away behind the more visible equipment, holding up the wiring that keeps power moving, signals running, and communication networks alive. Something you don’t have to think about.
But when issues like loosened cables, corrosion, cracking of components, or grounding failures pop up, the attention falls on them. Nine times out of ten, the root cause traces back to an installation decision made months or years earlier.
It's the choices made during installation that cause the trouble. Here are the five mistakes that come up most often.
Mistake 1: Incorrect Cable Tray Routing
There's a version of routing that looks perfectly logical on a drawing and becomes a nightmare on site. When you plan a path without accounting for what's actually around it, you're setting the system up for problems you won't see until it's inconvenient to fix them.
When trays are routed too close to process lines, high-temperature zones, or areas with chemical exposure, they degrade over time. But it is an easy fix by paying attention to the real layout and environment in which the cables sit:
Keep trays at safe distances from heat and corrosive zones.
Leave enough access space for inspection and maintenance
Prioritise long-term performance over short-term convenience.
Layout integrity is what really matters. Good routing protects the cables from the environment they're living in.
Mistake 2: Improper Cable Tray Support Spacing
Support spacing is one of those things that gets decided early and rarely revisited. Which is exactly why it goes wrong.
When supports are spaced too far apart, trays begin to sag. At first, it’s barely noticeable. Over time, load distribution will be unevenly distributed, fasteners will become loose, and the structure will be subjected to stresses it was not designed for. In high-vibration refinery environments, this accelerates faster than expected.
What should actually happen:
Calculate spacing based on the actual load figure.
Account for cables that will be added later.
Ensure that all supporting systems are designed for industrial environments.
Check the spacing during installation, while there's still time to correct it.
Mistake 3: Overloading That Builds Gradually
No one installs an overloaded tray on purpose. It happens incrementally. Each new addition gradually leads to overcrowding when the cable tray isn’t designed to accommodate future expansion.
At that point, heat can't dissipate properly, tracing which cable belongs to what becomes a guessing game, and the risk of faults increases.
Staying ahead of it means:
Designing with spare capacity built in from the start.
Keeping power, control, and data cables separated where required.
Checking load periodically instead of assuming there's still room.
Expanding the tray system when it's needed rather than forcing more cables into less space.
Mistake 4: Underestimating Grounding and Bonding
Grounding is an unavoidable step during installation. A mistake happens when it is not given the importance it deserves or if it is done incorrectly.
In a refinery, without proper grounding and bonding across tray sections, fault currents don't have a safe path to follow. That means elevated risk of electric shock, equipment damage, and the kind of static buildup that nobody wants in a process-heavy environment.
Doing it right requires discipline, not just awareness:
Maintain electrical continuity across every section of the tray.
Use appropriate bonding jumpers and grounding conductors.
Test the grounding system properly at commissioning.
Follow established industrial installation guidelines.
Grounding isn't something you add at the end. It's part of how the system is safe from the beginning.
Mistake 5: Choosing Materials Without Thinking About the Environment
A cable tray that's perfectly suited to a clean, controlled facility can start corroding within months in a refinery.
Elements such as heat, chemicals, moisture, and exposure need to be considered while choosing materials for the cable trays. In this instance, standard materials, such as steel and aluminium, may not be suitable because once corrosion begins, it will not stop.
This results in reduced structural integrity, maintenance becomes difficult, and at some point, you will need to replace the cable tray.
The decisions that prevent this from happening before installation starts:
Choose materials that match the actual environment, for example, stainless steel and hot-dip galvanised trays for more corrosion protection.
Use protective coatings in high-exposure areas.
Assess environmental conditions seriously before settling on materials.
Follow installation practices specific to refinery conditions, not general-purpose guidelines.
What All of This Has in Common?
These five mistakes aren't really separate issues. They're symptoms of the same underlying problem: installation decisions made without fully accounting for what the refinery environment actually demands.
A system that holds up over time doesn't happen by accident. It comes from routing that respects the process environment, supports spacing designed around real loads, controlled cable capacity, grounding that actually works, and materials chosen for long-term exposure, not just upfront cost.
When those decisions are made well at installation, the system doesn't need constant attention. It just works.
Conclusion:
Remember, the mistakes covered above are preventable. They start with using the right materials from a manufacturer who understands industrial environments.
Elcon Global has been building cable management systems for refineries and process industries for over three decades. Stainless steel, hot-dip galvanised, wire mesh, ladder cable tray - we manufacture the full range, to spec, under one roof.
Reach out to us today to figure out the right cable tray system for your refinery.










