Upgrading & uprating of existing cable systems

The TB written by the WG B1.11 gives a simple step-by-step methodology with flowcharts in order to guide the engineer into an upgrading process of an existing UG cable system (uprating being considered as a subset of upgrading). The steps are described, from the definition of the target for upgraded situation, the assessment of the existing situation and the identification of issues, up to the selection of potential upgrading techniques, the evaluation of their impacts and the decision making. Practical examples are given. Conclusion is that each case is specific and must be studied with great care because of possible interference of parameters.