6. Choice

6.1 General

The insulators are selected :

• as a function of line operating voltage ;

• depending on the mechanical stresses to which they are subjected (weight of conductors and ice, wind action, mechanical tension of conductors, if any) ;

• with regard to their nature (rigid or suspended), depending on the cost of the line and its size; in general, for small cross-sections (< 50 mm ² ), a line on rigid insulators is less expensive than a line on suspended insulators, at least in regions not subject to significant climatic overloads;

• depending on site pollution.

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