Vetojohdin

Vetojohdin is a temporary or auxiliary conductor used primarily during the installation of cables and wires. It is a high-tensile, flexible line, typically made of galvanized steel, stainless steel, or strong synthetic fiber, and it is intended to aid the pulling or guiding of cables through ducts, conduits, trenches, or across distances where a direct pull would be difficult. The vetojohdin itself does not form part of the final electrical or communication circuit; once the installation is complete, the wire is removed.

In practice, a vetojohdin is prepared at both ends with fittings such as pulling eyes or clamps and is commonly used with pulling equipment like winches, come-alongs, or cranes. It may be laid along routes with lubricants to reduce friction inside conduits and to protect cable insulation from damage. Attaching the vetojohdin to the cable to be installed should be done with appropriate ties or grips, and care must be taken to avoid sharp bends or kinks that could damage either the conductor or the pulling line.

Key considerations include selecting a line with adequate breaking strength for the load, controlling tension, using swivels to prevent twisting, and ensuring proper protection at points where the line passes near edges or through bends. Safety measures involve de-energizing systems as required, wearing protective equipment, and monitoring tension to prevent injuries or damage.

Vetojohdin is commonly referenced in electrical and telecom installations, construction projects, and any scenario requiring the safe insertion of long cables into confined spaces.