In the following sections we therefore describe the use of SPDs in various system
configurations. These circuit proposals are taken from IEC 60364-5-534. The concepts
shown illustrate the use of lightning current arresters mainly in the area of the service
entrance box, i.e. upstream of the meter. IEC 60364-5-534 defines the installation site
of lightning current arresters as ‘close to the origin of the installation’. The preferred
design for each kind of supply (system configuration) must be ascertained from the
responsible distribution network operator (DNO).