Introduces the regulations governing pole lines, mainly ESA Regulation 22/04 and CSA Guidelines. We survey the components of the overhead system, analyze the forces on poles and talk about grades of construction and load factors, followed by a detailed study of sags, tensions, clearances and the guying of poles. Finally, we cover the software options available for these calculations.
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A review of the regulatory standards for the construction of overhead circuits, most of which are built on public road allowances. In Canada, these are mainly CSA codes, supplemented here in Ontario by Regulation 22/04.
Course Code: ST1
Runtime: 20 minutes
Understanding forces and loads are fundamental to the design of pole lines. This module examines the various forces on a pole, how to factor climate into pole line design, safety factors and grades of construction.
Course Code: ST2
Prerequisite: Introduction to Sags, Tensions, and Guying for Distribution Circuits Course (ST1)
Runtime: 70 minutes
We discuss sag, how it relates to tension and the factors that influence both. We then introduce formulas to calculate sags and tensions. The module also covers the vertical clearances required between conductors and other circuits, structures and rail lines. Finally, we address the effect of conductor swing on horizontal clearances.
Course Code: ST3
Prerequisite: Introduction to Sags, Tensions, and Guying for Distribution Circuits Course (ST1), and Forces and Loads in Overhead Distribution Systems Course (ST2)
Runtime: 35 minutes
After a graphic illustration of the need for proper guying, we review the various components of a guying system including the wire, insulators, anchors, and how soil classification impacts holding strength. We work through detailed guying calculations and look at the how software is used in these calculations.
Course Code: ST4
Prerequisite: Introduction to Sags, Tensions, and Guying for Distribution Circuits Course (ST1), Forces and Loads in Overhead Distribution Systems Course (ST2), and Sags and Tensions in an Overhead Distribution System Course (ST3)
Runtime: 35 minutes