As it is a function of geography the wind span does not change for different weather conditions. Wind Span is the ‘mean of the sum of adjacents’ or the back span plus the ahead span, all divided by two.

Standard span is the distance between which two ‘standard height’ structures that the conductor can maintain the required clearance distance over level ground. Is the true (3D) distance between the centre of one structure to the centre of the next structure. The structure span length can be different from the circuit span lengths and the ‘inclined span length’. The span length is the horizontal (2D) distance between the centre of one structure to the centre of the next structure. Before we start, let’s discuss some terminology regarding span criteria. we are going to explain the different types of Structure Model, how those are defined, how they can be used and what are the advantages and disadvantages of each one. We are going to go through these Structure Methods one at a time, and without referring to M1, M2 etc. Let’s start with the Structure Methods (that’s where the M comes from) and let’s forget about numbers and talk about meaning. That way you can avoid misunderstanding, and you will find that really soon all those weird L1’s and M4’s will stop being an arcane pursuit and become a convenient shorthand for something very meaningful. Call them by the purpose of the structure model or analysis that you are performing.

Completely ignore the fact that L1 through 4 or M1 through 4 exist.ĭon’t call them by the abbreviations, which may lead to misunderstanding. If you’re an old hand at the software, these definitions will be absolutely clear to you and won’t require and explanation, if you are relatively new to the software, my advice is to not use them. How can we remember the complicated terminology associated with PLS CADD, such as M1, M2, M3 and M4 models?

Pls cadd manual