There are pipelines not connected to the cable tray

Pipelines should maintain proper clearance from cable trays, with anti-corrosion and insulation measures applied if minimum distances cannot be met.

Clearance and Safety Distances

When pipelines are not connected to cable trays, it is essential to maintain adequate separation to prevent electrical hazards, heat damage, or corrosion. For thermal pipelines with insulation, the parallel safety distance from cable trays should be at least 0.5 meters, and 1 meter if insulation is absent. For common process pipes, a minimum distance of 0.4 meters is recommended. Pipelines carrying corrosive liquids or gases require at least 0.5 meters clearance, with protective coatings or corrosion-resistant covers applied if trays are nearby .

Installation Orientation

Cable trays should generally be installed on one side of the pipe rack and not directly above corrosive or thermal pipelines. If crossing is unavoidable, protective measures such as thermal insulation boards or corrosion-resistant cover plates should be used, with the length of protection extending at least d + 2000 mm, where d is the pipeline diameter .

Maintenance and Accessibility

Unconnected pipelines should be routed to maximize accessibility. Installing pipelines under cable trays is often preferred, as it allows easier maintenance and reduces the risk of drips or radiant heat affecting the cables. Proper shielding or splash guards can further protect the cable tray from leaks or heat radiation .

Grounding and Structural Considerations

Cable trays must be reliably grounded, with connections to the main grounding line at multiple points. Support spans for horizontal trays should be 1.5–3 meters, and vertical fixed points should not exceed 2 meters. Pipelines should not compromise these support requirements .

Summary

Even if pipelines are not physically connected to cable trays, maintaining adequate clearance, applying protective measures, and ensuring proper orientation are critical for safety, operational efficiency, and compliance with engineering standards . Regular inspections should verify that these distances and protections are maintained throughout the facility's lifetime.