Overhead Transmission & Distribution Power Structure Installation
This article is about Overhead Transmission & Distribution Power Structure Installation for commercial buildings, plants and refinery projects as per international codes and standards.
Installation of Transmission and Distribution Lines
Lines more than 2 km long shall be double dead-ended a minimum of every 1.5 km.
Non-current carrying metallic enclosures, brackets, and braces shall be bonded together via grounding lugs and shall be connected to a grounding electrode conductor.
Pole ground conductors shall be minimum 4 AWG, stranded, soft drawn, bare copper. Refer to AA-036015, AD-036016, AD-036135 and/or AD-036136 for details.
Except where specifically noted otherwise in this document 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 shall not be loaded in excess of 40% of their rated ultimate strength.
Overhead guys shall be connected to the supporting structure grounding electrode conductor at both ends. Down guys shall be connected at the upper end.
Guys from supporting structures having ungrounded or resistance grounded circuits shall be insulated with strain insulators.
Guy insulators shall not be used with guy strands having ultimate strengths greater than 80 kN.
Guy insulators shall have a rated ultimate strength greater than the rated breaking strength of the guy.
Double dead-end pole installation shall be as per standard drawing # AA-036015.
Bonding for armless construction angle, 60-90 shall be as per standard drawing # AD-036016.
Armless construction angle structure, 15-30 shall be as per standard drawing # AC-036021.
Armless construction angle structure, 60-90 shall be as per standard drawing # AC-036022.
Pole top switch grounding shall be as standard drawing # AD-036133.
Bonding for post insulator shall be as per standard drawing # AD-036135.
Bonding armless construction angle structure,60-90 shall be as per standard drawing # AD-036136.