6.1Introduction#

This Section addresses the various types of surge protective devices (SPDs) and their selection, installation and typical application within the electrical infrastructure of Transport and Main Roads. It is intended to provide designers with technical background knowledge and an understanding of SPDs as well as providing general practical guidance on the use of SPDs; however, engineering judgement is required in the use of this information and specialist / manufacturer advice may need to be sought in the use of particular products in specific applications. This document does not purport to cover the entire field of surge protection. Extensive reference has been made to AS/NZS 1768 Lightning protection and to IEC 61643 Low voltage surge protective devices.