Values are given in the tables these values are either internationally standardized, for example electric resistivities and resistance temperature coefficients, or those which are generally accepted in practice, for example specific heats.In order that uniform and comparable results may be obtained, the short-circuit ratings shall be calculated using the method and the values given in this standard. It is recognized that more sophisticated computer methods are available but these do not significantly affect the accuracy and are considered too complex to be standardized.The formulae contain quantities which vary with the materials used in the cables.
0 kommentar(er)
