Overhead Line Accessories Transmission & Distribution Circuit Accessories

This article is about Technical specification, equipment drawing, materials, hardware required for Overhead Line Accessories, Transmission & Distribution Circuit Accessories for commercial buildings, plants and refinery projects as per international codes and standards.

Material Selection Guide & Technical Specification

Overhead circuit accessories / equipment shall be new and unused.

Overhead circuit accessories / equipment shall be in accordance with the Saudi Aramco-approved project-specific design drawings, diagrams, schedules, lists, database, and associated design documents.

Overhead circuit accessories / equipment shall be free from damage during transportation.

Guy insulators shall have a rated ultimate strength greater than the rated breaking strength of the guy.

Guy and messenger attachment hardware shall be preformed type dead end fittings or automatic guy grips.

Messengers shall be of the stranded steel type. Messengers shall be sized for the ultimate number of cables to be installed.

Except where specifically noted or the referenced standard drawings, minimum insulator creepage for components shall be 40 mm per KV line-to-line nominal system voltage.

Post and suspension type insulators shall be used. Pin type insulators shall not be used. Insulator brackets shall be metallic Semi conducting or resistive glaze insulators shall not be used.

Insulators used on overhead distribution systems shall meet the requirements of the ANSI C29 series of standards.

Fog type porcelain suspension insulators shall be used to terminate overhead circuits at a substation bay or supporting strain bus.

Overhead circuit accessories / equipment including terminating devices, shall be rated for application at line-to-line system voltages.

Supporting structures for accessories shall have a minimum stress safety factor of 4.0.

Check that Load break switches are supplied for sectionalizing points.