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Fatigue strength of overhead conductors of different types is often presented on the same diagram, a so-called S-N diagram, the vertical axis being generally taken as the alternating stress amplitude. In this paper, it is shown that these stress levels are merely fatigue indicators with inherent limits, and should be used accordingly. Their practical interest is to allow a regrouping of the fatigue results of different types of conductors. It will be shown that these indicators have some inherent limits in their definition and can only be used according to their intended purpose.