Cable sizing calculations in industrial installations

Abstract

Correct calculations or sizing of any device or equipment plays significant role in design of installation. In case of wrong design, it could lead to abnormal operation of installation or even worse consequences. This problem could be faced during sizing (choosing appropriate cross-section) of low voltage (LV) cables. LV cables present the major part of distribution network which supply end consumer and since then they are the very important part in stable operation of network. The main document which regulates aforementioned question is IEC 60364-5-52. However, it consists of many recommendations, references to other concern standards and has no clear structure of conditions which shall be fulfilled for correct dimension of cable. Purpose of this thesis is to explain main statements of mentioned standard, suggests simplified algorithm of correct dimensioning of LV cables even for not specialized person and shows examples of its correctness.