A method of designing lightning protection systems for the exterior lightning protection of buildings and installations, wherein the lightning current arresting device of the lightning protection system is at least in part configured as an insulated electrical conductor having a conductive layer or casing of the insulation, and located in the respective building or the respective installation are conductive structures which are potentially exposed to an induction occurring in the event of a lightning current to be arrested and, in this regard, the conductive layer on the insulated arresting device forms a secondary loop with the respective conductive structure, comprising the following steps: - analyzing the spatial position of the conductive structures in the building or the respective installation to be protected and identifying possible secondary loops; - determining critical distances of the insulated arresting device and estimating the induction effect in the secondary loop based on standard lightning surge current variables for the range of the critical distances which cannot be changed by increasing the separation distance, taking into account the total length of the insulated arresting device and the total displacement current resulting therefrom; - comparing the evaluated induction-related possible maximum circulating current in the secondary loop to an acceptable limit value; - modifying the insulated arresting line in case an exceeding of the limit value is to be expected, in accordance with a design optimized for the case of application and dimensioning of the resistance value by selectively increasing the resistance value of the conductive layer or casing applied to the insulation of the arresting line, wherein the upper limit of the resistance increase is predefined by the sliding discharge operating field strength in the respective section that has been modified in terms of resistance value, wherein the section that has been modified in terms of resistance value is a low conductivity segment and the design of the low conductivity segment is performed such that the resulting current in the secondary loop follows the first time derivative of the lightning current, and wherein the conductive layer of the insulated arresting line is of high impedance over its entire operating length, but a value of 0.5 to 10 kOhm/m is not exceeded. wherein the lightning current arresting device of the lightning protection system is at least in part configured as an insulated electrical conductor having a conductive layer or casing of the insulation, and located in the respective building or the respective installation are conductive structures which are potentially exposed to an induction occurring in the event of a lightning current to be arrested and, in this regard, the conductive layer on the insulated arresting device forms a secondary loop with the respective conductive structure, comprising the following steps: - analyzing the spatial position of the conductive structures in the building or the respective installation to be protected and identifying possible secondary loops; - determining critical distances of the insulated arresting device and estimating the induction effect in the secondary loop based on standard lightning surge current variables for the range of the critical distances which cannot be changed by increasing the separation distance, taking into account the total length of the insulated arresting device and the total displacement current resulting therefrom; - comparing the evaluated induction-related possible maximum circulating current in the secondary loop to an acceptable limit value; - modifying the insulated arresting line in case an exceeding of the limit value is to be expected, in accordance with a design optimized for the case of application and dimensioning of the resistance value by selectively increasing the resistance value of the conductive layer or casing applied to the insulation of the arresting line, - analyzing the spatial position of the conductive structures in the building or the respective installation to be protected and identifying possible secondary loops; - determining critical distances of the insulated arresting device and estimating the induction effect in the secondary loop based on standard lightning surge current variables for the range of the critical distances which cannot be changed by increasing the separation distance, taking into account the total length of the insulated arresting device and the total displacement current resulting therefrom; - comparing the evaluated induction-related possible maximum circulating current in the secondary loop to an acceptable limit value; - modifying the insulated arresting line in case an exceeding of the limit value is to be expected, in accordance with a design optimized for the case of application and dimensioning of the resistance value by selectively increasing the resistance value of the conductive layer or casing applied to the insulation of the arresting line, wherein the upper limit of the resistance increase is predefined by the sliding discharge operating field strength in the respective section that has been modified in terms of resistance value, wherein the section that has been modified in terms of resistance value is a low conductivity segment and the design of the low conductivity segment is performed such that the resulting current in the secondary loop follows the first time derivative of the lightning current, and wherein the conductive layer of the insulated arresting line is of high impedance over its entire operating length, but a value of 0.5 to 10 kOhm/m is not exceeded.