What is the purpose of the manufacturer’s instructions for Type 3 SPDs?

The purpose of the manufacturer’s instructions for Type 3 Surge Protective Devices (SPDs) is to specify distances for installation. These instructions provide critical information on how far the SPD should be installed from the protected equipment, which is vital for ensuring effectiveness. Proper distance influences the SPD's performance, particularly in terms of response time and attenuation of surge events.

Following the manufacturer's guidance on installation distances helps to optimize the SPD’s performance and ensures that it can adequately protect against transient overvoltages from lightning strikes or other electrical disturbances. This aspect of installation is fundamental for maintaining the reliability and safety of the electrical system.