What Is a Marking Tube?
Marking tubes are used to identify electrical wires in control panels. They are placed over wires and printed with wire numbers for easy identification.
Uses of Marking Tubes
These tubes prevent wiring errors and improve work efficiency, especially in team settings. They are typically placed on both ends of wires and are also used for protection and insulation.
Types of Marking Tubes
Most marking tubes are white with black lettering and vary in diameter from 2 mm to 8 mm. They come in plain types for self-labeling, pre-numbered types, and custom types for specific needs. Made primarily of soft polyvinyl chloride (PVC), they offer flame retardance and good weather resistance but have limited heat resistance.
How to Use Marking Tubes
For readability, place the tubes so that numbers can be read from the same direction on both sides. The inner diameter of the tubes should be larger than that of the wires.