If SPDs are installed as shown in Figure 7.65, the S2 and S3 connecting cables must
only be rated on the criteria of short-circuit protection according to IEC 60364-5-53
and the impulse current carrying capability (the data sheet of the protective device
provides the maximum permissible overcurrent protection that can be used in this
application as backup protection for the arrester). When installing the devices, it
must be ensured that the short-circuit current actually flowing is able to trip the