The common materials of underground cable marker posts are fiberglass marker posts, cement marker posts, and PVC plastic steel marker posts. Generally, the cement marker posts have gradually faded out of the market due to inconvenient transportation, easy corrosion, and aesthetics. Currently, the most common ones on the market are fiberglass marker posts.

Common printed terms for underground cable marker posts include: "There are cables underground, excavation is prohibited", "High voltage danger of pipelines", "Power cables, excavation is prohibited", "Cable passage, excavation is prohibited", "Both sides of the cable, excavation is prohibited", "Fishing under high voltage lines is prohibited", and so on.

Code for laying underground cable marker posts

1. Cable marker posts shall be installed directly above the pipeline. When used as corner piles, cable marker posts shall be installed directly above the midpoint of the corner section. When there is no installation condition directly above the pipeline, it can be installed in a roadside green belt that is relatively close to the pipeline, and the pipe pile suitability diagram can be marked on the cable marker post.

2. Cable marker posts shall not be installed on fully enclosed roads. The installation spacing of cable marker posts should be 100m. The installation spacing of cable marker posts can be greater than 100m with flat ground, few visual obstructions, and smooth and straight pipeline routing. For special sections, the specific laying specification system shall be followed for the laying of pipeline marker posts!

3. Cable marker posts are mainly made of plastic steel, glass fiber reinforced plastic, and composite materials buried along natural gas high-pressure pipelines, and painted with yellow marks. To serve as a reminder and warning, they are marked with "gas pipelines, gas telephones, pipeline stake numbers, pipeline routing, and electronic patrol information buttons", facilitating patrol and emergency repair personnel to quickly locate the pipeline location and win the opportunity for emergency repair. According to Article 36 of the "Regulations on the Administration of Urban Gas", it is illegal to dismantle and move the cable marker posts buried on the high-pressure natural gas pipelines without authorization.

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