and the rate of current change (di/dt) for transient processes of a few 10 kA ms21, the
dynamic voltage drop Udyn is considerably determined by the inductive component. In
order to keep this dynamic voltage drop low, the electrician carrying out the work must
keep the inductance of the connecting cable and hence its length as low as possible.
IEC 60364-5-53 therefore recommends designing the total cable length of SPDs in
branch circuits to be no longer than 0.5 m (Figure 7.59).