MS-type devices are designed for visual indication of wires, ground wires, and optical cables suspended on overhead power lines (OHL). Made from brightly colored polyvinyl chloride (PVC), they enhance the visibility of wires and ground wires for flying birds, as well as for vehicle drivers at OHL crossings with roads and waterways. They comply with the requirements of STO 34.01-2.2-012-2016 of PJSC "Rosseti" and are manufactured according to TU 3449-001-52819896-2013.

Design
The marker is a spiral with variable pitch and diameter, made from a round PVC rod with a diameter of 10–17 mm. The spiral consists of two sections:

1. Installation section — intended for attaching the marker to the wire, ground wire, or cable.
2. Signal section — provides visual indication.

Markers are available in two versions: with one and two installation sections.

Technical Specifications

• Wire (ground wire, cable) diameter: from 4.45 mm to 31.50 mm
• Marker length: from 180 mm to 1000 mm
• Weight